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Mechanical Engineering Laboratory Manual Answer Key For The Laboratory Manual Back Index Lab Draw Window Unit
315 LAB 39.1 DRAW WINDOW UNIT DIAGRAM LAB 39.2 WIRE WINDOW UNIT DIAGRAM This exercise is more of a “hands on” rather than a written exercise. LAB 39.3 DRAW PACKAGED AC UNIT DIAGRAM Have students refer to Fundamentals of HVACR […]
Mechanical Engineering Laboratory Manual Answer Key For The Laboratory Manual Back Index Some The Newly Developed
ANSWER KEY for the LABORATORY MANUAL GO BACK TO INDEX Some of the newly developed refrigerants may have zero ozone depletion potential, however all the refrigerants will have some value for global warming. The high and low side test pressures […]
Mechanical Engineering Laboratory Manual Answer Key For The Laboratory Manual Back Index The Laboratory Manual For
275 ANSWER KEY for the LABORATORY MANUAL GO BACK TO INDEX The Laboratory Manual for Fundamentals of HVACR Laboratory Manual, Second Edition, allows for different lab settings and associated equipment. Therefore answers to procedural LAB 2.1 HVACR JOBS Entry-level helper, […]
Mechanical Engineering Unit 1 To 10
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) In the modern refrigeration cycle, the compressor: A) Increases the pressure of the liquid refrigerant so that it will circulate through […]
Mechanical Engineering Unit 1 To 10 Answer Keytestname Unit Answer Keytestname Unit Answer Keytestname Unit Answer Keytestname Unit
Answer Key Testname: UNIT 1 TO 10 43) B, C, E, F, H 44) C 45) B 46) A 47) C 48) D 49) B 50) A 51) B 52) D 53) B 54) A 55) B 56) A 57) […]
Mechanical Engineering Unit 1 To 10 Define Critical Point The Pressure And Temperature Where Substance Can Exist Simultaneously
391) 391) Define critical point. A) The pressure and temperature where a substance can exist simultaneously as a solid, a liquid, and a gas in thermal equilibrium B) The pressure and temperature where a solid and a liquid have the […]
Mechanical Engineering Unit 1 To 10 Gravity Causes Liquids Exert Force Downward All Directions Downward And The Sides
314) 314) Gravity causes liquids to exert force: A) Downward. B) In all directions. C) Downward and to the sides. D) Liquids do not exert force. Answer: C Explanation: A) B) C) D) 315) 315) When the performances of systems […]
Mechanical Engineering Unit 1 To 10 Hvacr Technician Takes Reading Which Type Gauge Using Impossible Tell Using Manometer
237) 237) An HVACR technician takes a reading of 25 in Hg. Which type of gauge is he using? A) It is impossible to tell. B) He is using a manometer. C) He is using a high–pressure gauge. D) He […]
Mechanical Engineering Unit 1 To 10 Units The Measurement System Are Subdivided Into Units Units Divisible Common Fractional
157) 157) Units in the SI measurement system are subdivided into: A) Units of 10. B) Units divisible by 2. C) Common fractional quantities. D) Units divisible by 3. Answer: A Explanation: A) B) C) D) 158) 158) A container […]
Mechanical Engineering Unit 1 To 10 When The Safety Cap Removed From Acetylene Cylinders That Hold More The
75) When the safety cap is removed from acetylene cylinders that hold 55 ft3 or more: 75) A) The cylinder must have a regulator installed on it. B) The cylinder must be chained to a cart or structure. C) The […]
Mechanical Engineering Unit 1 Unit Review Questions Answer Key Back Index List Some The Different Ways
UNIT 1 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 1-1) List some of the different ways that homes and buildings may be heated. Wood, gas, oil, electric, solar, heat pumps, and geothermal heating systems are used. 1-2) What were […]
Mechanical Engineering Unit 10 Unit Review Questions Answer Keygo Back Index How Does Atmospheric Pressure Affect
UNIT 10 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 10-1) How does atmospheric pressure affect a refrigeration gauge pressure reading? Refrigeration gauges read in psig and are calibrated to read 0 at atmospheric pressure. Changes in atmospheric pressure can […]
Mechanical Engineering Unit 11 To 20 Compressor Cylinder Unloading Reduces The Capacity Reciprocating Compressor Flooding The Unloaded Cylinders
77) 77) Compressor cylinder unloading reduces the capacity of a reciprocating compressor by: A) Flooding the unloaded cylinders with oil. B) Disconnecting the pistons in the unloaded cylinders. C) Blocking off the discharge port in the unloaded heads. D) Making […]
Mechanical Engineering Unit 11 To 20 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) What is the main component that makes a thermoelectric cooling system work? A) An absorber B) A wetted media C) A […]
Mechanical Engineering Unit 11 To 20 Refrigerant Blend With Glide More Would Considered Low Glide Blend Azeotrope Compound
313) 313) A refrigerant blend with a glide of 10°F or more would be considered: A) A low glide blend. B) An azeotrope. C) A compound. D) A high glide blend. Answer: D Explanation: A) B) C) D) 314) 314) […]
Mechanical Engineering Unit 11 To 20 Refrigeration System Requires Superheat The Evaporator Saturation Pressure Psig What Should The
154) 154) An R–22 refrigeration system requires a superheat of 8°F. If the evaporator saturation pressure is 43 psig, what should the bulb temperature be? A) 35°F B) 8°F C) 28°F D) 51°F Answer: C Explanation: A) B) C) D) […]
Mechanical Engineering Unit 11 To 20 The Refrigerant Mechanical Compression Refrigeration System Absorbs And Releases Heat Changing Its
386) 386) The refrigerant in a mechanical compression refrigeration system absorbs and releases heat by: A) Changing its physical state. B) Changing its molecular composition. C) Converting energy to mass. D) Changing its temperature. Answer: A Explanation: A) B) C) […]
Mechanical Engineering Unit 11 To 20 When Drawing Diagram Operating System How Placement The Metering Device Line Determined
233) 233) When drawing a PH diagram of an operating system, how is placement of the metering device line determined? A) The metering device line starts where the condenser line crosses the temperature of the liquid line and then drops […]
Mechanical Engineering Unit 11 Unit Review Questions Answer Keygo Back Index List The Different Types Cooling
UNIT 11 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 11-1) List the different types of cooling mechanisms. Evaporative, thermoelectric, absorption, mechanical compression 11-2) Which type of cooling mechanism is used in the most applications? Compression cycle 11-3) Briefly explain […]
Mechanical Engineering Unit 12 Unit Review Questions Answer Keygo Back Index Briefly Explain The Fundamentals Principles
UNIT 12 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 12-1) Briefly explain the fundamentals principles that make the compression- refrigeration cycle work. The refrigeration cycle is made possible by the pressure difference, which is maintained by the compressor and […]
Mechanical Engineering Unit 13 Unit Review Questions Answer Keygo Back Index What The Only Thing All
UNIT 13 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 13-1) What is the only thing all compressors must pump? Vapor 13-2) List the major types of compressors by mechanical design. Reciprocating, rotary, scroll, screw, centrifugal 13-3) Explain the difference […]
Mechanical Engineering Unit 14 Unit Review Questions Answer Keygo Back Index What The Purpose Condenserthe Purpose
UNIT 14 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 14-1) What is the purpose of a condenser? The purpose of a condenser coil is to reject unwanted heat from a refrigeration or air conditioning system. It does this by […]
Mechanical Engineering Unit 15 Unit Review Questions Answer Keygo Back Index What Happens The Refrigerant Passes
UNIT 15 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 15-1) What happens to the refrigerant as it passes through the metering device? The refrigerant drops in pressure and temperature as it passes through the metering device. A small portion […]
Mechanical Engineering Unit 16 Unit Review Questions Answer Keygo Back Index What The Purpose The Evaporator
UNIT 16 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 16-1) What is the purpose of the evaporator in the refrigeration system? The evaporator absorbs heat out of the product and into the refrigeration system. 16-2) Why does the heat […]
Mechanical Engineering Unit 17 Unit Review Questions Answer Keygo Back Index Define Refrigerantrefrigerant The Fluid Used
UNIT 17 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 17-1) Define refrigerant. Refrigerant is the fluid used in a refrigeration system for transferring heat. Refrigerants in mechanical refrigeration systems do this by changing their physical state. They absorb heat […]
Mechanical Engineering Unit 18 Unit Review Questions Answer Keygo Back Index What Evaporator Pressure Regulatoran Evaporator
UNIT 18 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 18-1) What is an evaporator pressure regulator? An evaporator pressure regulator (EPR) is a refrigerant flow control device that prevents the refrigerant pressure in the evaporator from operating below a […]
Mechanical Engineering Unit 19 Unit Review Questions Answer Keygo Back Index List The Refrigerant Characteristics That
UNIT 19 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 19-1) List the refrigerant characteristics that are shown on a pressure-enthalpy diagram (PH). PH diagrams show the relationship of a refrigerant’s pressure, heat, temperature, volume, and state. 19-2) What is […]
Mechanical Engineering Unit 2 Unit Review Questions Answer Keygo Back Index List Three Student Organization Clubsaccas
UNIT 2 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 2-1) List three student organization clubs. ACCA’s student club, RSES student club, and ASHRAE’s student club 2-2) What does RSES stand for? Refrigeration Service Engineers Society 2-3) What does ACCA […]
Mechanical Engineering Unit 20 Unit Review Questions Answer Keygo Back Index Who Was The Person That
UNIT 20 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 20-1) Who was the person that was instrumental in developing the firstCFCs? Thomas Midgley 20-2) Why it is important to review the SDS before an accident happens? So that you […]
Mechanical Engineering Unit 21 To 30 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) What type of detector should be used if a technician is looking for a refrigerant leak in a closed space? A) […]
Mechanical Engineering Unit 21 To 30 Third Party Testing For Recovery Units Has Been Required Since July November
158) 158) Third–party testing for recovery units has been required since: A) July 1, 1992. B) November 15, 1993. C) November 14, 1994. D) November 15, 1995. Answer: B Explanation: A) B) C) D) 159) 159) How is recovering into […]
Mechanical Engineering Unit 21 To 30 Why Are Face Shields Worn During Arc Welding Magnify The Work Area
81) 81) Why are face shields worn during arc welding? A) To magnify the work area and make it easier to see B) To keep the technician from breathing in harmful fumes C) Face shields are not necessary when arc […]
Mechanical Engineering Unit 21 To 30 Why Should Circuits That Are Locked Out Also Tagged Notify The Customer
231) 231) Why should circuits that are locked out also be tagged? A) To notify the customer where they can pay their bill B) As backup to prevent people from cutting the lock off and turning the power on C) […]
Mechanical Engineering Unit 21 To 30 Why The Clean Air Acts Title Section Relevant For Technicians Recommends Self
364) 364) Why is the Clean Air Act’s Title VI, Section 608 relevant for technicians? A) It recommends self–enforcement on coolant emissions. B) It bans piercing sealed air conditioning systems. C) It regulates refrigerant emissions. D) It repeals requirements on […]
Mechanical Engineering Unit 21 To 30 Will Chart That Only Specifies The Outdoor Ambient Temperature Still Read Accurately
310) 310) Will a chart that only specifies the outdoor ambient temperature still read accurately if the indoor relative humidity is very far from 50 percent? A) No, because the intersection would always fall below the red line in this […]
Mechanical Engineering Unit 21 Unit Review Questions Answer Keygo Back Index Why Would Service Technician Need
UNIT 21 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 21-1) Why would a service technician need a system’s temperature and pressure? To diagnose refrigerant problems 21-2) What does a temperature meter measure? The speed of molecular movement, or vibration. […]
Mechanical Engineering Unit 22 Unit Review Questions Answer Keygo Back Index What The Difference Between Pipe
UNIT 22 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 22-1) What is the difference between pipe and tubing? Pipe is always named by its approximate inside diameter, called its nominal size. Tubing is usually measured by its outside diameter. […]
Mechanical Engineering Unit 23 Unit Review Questions Answer Keygo Back Index Why Must Proper Protective Clothing
UNIT 23 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 23-1) Why must proper protective clothing be worn during soldering and brazing? To protect from potential hazards created by flames: heat, ultraviolet light, sparks, and molten metal. 23-2) What harmful […]
Mechanical Engineering Unit 24 Unit Review Questions Answer Keygo Back Index What Are The Two Major
UNIT 24 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 24-1) What are the two major functions of refrigerant piping? The two functions of refrigerant piping are to carry refrigerant and oil. 24-2) What affect does oil have on a […]
Mechanical Engineering Unit 25 Unit Review Questions Answer Keygo Back Index What The Term For Slightly
UNIT 25 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 25-1) What is the term for slightly opening a valve? Cracking the valve 25-2) List three precautions when handling a gauge manifold set. Never drop or abuse the gauge manifold. […]
Mechanical Engineering Unit 26 Unit Review Questions Answer Keygo Back Index What The Significance The Montreal
UNIT 26 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 26-1) What is the significance of the Montreal Protocol? The Montreal Protocol IS AN International agreement that established target dates for the phase out of ozone depleting substances. 26-2) What […]
Mechanical Engineering Unit 27 Unit Review Questions Answer Keygo Back Index What The Purpose The Pressure
UNIT 27 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 27-1) What is the purpose of the pressure regulator on the nitrogen cylinder? To reduce the pressure in the nitrogen cylinder to a safe level. 27-2) A refrigeration system data […]
Mechanical Engineering Unit 28 Unit Review Questions Answer Keygo Back Index What Chemicals Should Inside Refrigeration
UNIT 28 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 28-1) What chemicals should be inside a refrigeration system? Refrigerant and refrigeration oil 28-2) How are vacuum pumps rated? CFM capacity and micron blank-off pressure 28-3) What is the purpose […]
Mechanical Engineering Unit 29 Unit Review Questions Answer Keygo Back Index Why Are Systems With Fixed
UNIT 29 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 29-1) Why are systems with fixed restriction metering devices critical to charge? They cannot adjust to changing conditions and they have no liquid receiver to store extra refrigerant. 29-2) How […]
Mechanical Engineering Unit 3 Unit Review Questions Answer Keygo Back Index Tell What Causes Accidents And
UNIT 3 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 3-1) Tell what causes accidents and how they can be eliminated on the job site. Most accidents are caused by carelessness, as well as lack of awareness of proper safety […]
Mechanical Engineering Unit 30 Unit Review Questions Answer Keygo Back Index The United States Electrical Hazards
UNIT 30 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 30-1) In the United States, electrical hazards cause more than deaths and injuries in the workplace every year. 300 deaths and 4,000 injuries 30-2) Electrical accidents rank among all causes […]
Mechanical Engineering Unit 31 To 40 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) Ohm’s law is a mathematical formula that describes the relationship between: A) Volts, amps, and ohms. B) Ohms, watts, and volts. […]
Mechanical Engineering Unit 31 To 40 Residential Hvacr Communicating Control System Includes You May Select More Than One
372) 372) A residential HVACR communicating control system includes (you may select more than one): A) A satellite uplink. B) A dedicated wireless router made specifically for HVACR. C) Communicating equipment control boards. D) A communicating thermostat or controller. Answer: […]
Mechanical Engineering Unit 31 To 40 The Current Relay Wired With The Relay Coil Parallel With The Run
306) 306) The current relay is wired with the: A) Relay coil in parallel with the run winding and the contacts wired in series with the start winding. B) Relay coil in parallel with the start winding and the contacts […]
Mechanical Engineering Unit 31 To 40 The Most Common Residential Control Voltage Answer Bexplanation What Type Control System
228) 228) The most common residential control voltage is: A) 115 V. B) 24 V. C) 12 V. D) 230 V. Answer: B Explanation: A) B) C) D) 229) 229) What type of control system has the ability to measure […]
Mechanical Engineering Unit 31 To 40 The Range Electric Meter Describes The Number Different Functions The Meter Has
80) 80) The range of an electric meter describes: A) The number of different functions the meter has. B) The meter’s price point. C) How low and high the meter will read for each function. D) Whether a meter is […]
Mechanical Engineering Unit 31 To 40 When Testing Normally Open Relay Contact With Energized Coil Should Measure Infinite
160) 160) When testing a normally open relay contact with a de–energized coil it should measure: A) Infinite or OL on digital meters. B) Some measurable resistance depending on the design of the relay. C) . D) None of […]
Mechanical Engineering Unit 31 Unit Review Questions Answer Keygo Back Index Describe The Basic Structure The
UNIT 31 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 31-1) Describe the basic structure of the atom. Atoms are made of small particles called protons, neutrons, and electrons. Protons are positively charged, electrons are negatively charged, and neutrons have […]
Mechanical Engineering Unit 32 Unit Review Questions Answer Keygo Back Index What Attraction And Repulsion Behavior
UNIT 32 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 32-1) What attraction and repulsion behavior do the north and south poles of a magnet exhibit? Like poles repel each other and opposite poles attract. 32-2) Explain the left hand […]
Mechanical Engineering Unit 33 Unit Review Questions Answer Keygo Back Index What Are The Three Test
UNIT 33 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 33-1) What are the three test instruments that can be used to verify no voltage is present in a de-energized circuit before beginning work? These are a non-contact proximity tester, […]
Mechanical Engineering Unit 34 Unit Review Questions Answer Keygo Back Index Fixed Resistor Has The Following
UNIT 34 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 34-1) A fixed resistor has the following color bands – orange, red, brown, gold. What is the rated resistance? From Chart 36-4, orange = 3, red = 2, brown =1 […]
Mechanical Engineering Unit 35 Unit Review Questions Answer Keygo Back Index What Meant Motor Torquetorque The
UNIT 35 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 35-1) What is meant by motor torque? Torque is the twisting (or turning) force that must be developed by a motor to turn whatever it is driving. 35-2) What are […]
Mechanical Engineering Unit 36 Unit Review Questions Answer Keygo Back Index What Relaya Relay Electrically Operated
UNIT 36 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 36-1) What is a relay? A relay is an electrically operated switch that uses an electromagnet to open or close a set of electrical contacts. Normally only a small amount […]
Mechanical Engineering Unit 37 Unit Review Questions Answer Keygo Back Index Name The Two Standards Organizations
UNIT 37 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 37-1) Name the two standards organizations that publish standards for electric motors. Two organizations, the National Electrical Manufacturers Association (NEMA) and the International Electrotechnical Commission (IEC), specify standards for electric […]
Mechanical Engineering Unit 38 Unit Review Questions Answer Keygo Back Index List The Different Types Electrical
UNIT 38 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 38-1) List the different types of electrical diagrams used by HVACR manufacturers. a. ladder diagram b. schematic diagram c. component location diagram d. point to point diagram e. pictorial diagram […]
Mechanical Engineering Unit 39 Unit Review Questions Answer Keygo Back Index What The Difference Between Open
UNIT 39 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 39-1) What is the difference between an open loop and a closed loop control systems? An open loop control system does not affect the condition it is sensing. A closed […]
Mechanical Engineering Unit 4 Unit Review Questions Answer Keygo Back Index Why Important For Hvacr Technicians
UNIT 4 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 4-1) Why is it important for an HVACR technician’s tools to be clean and organized? The customer often judges a technician on the appearance of their tools. It is harder […]
Mechanical Engineering Unit 40 Unit Review Questions Answer Keygo Back Index What Communicating Control Systemin Communicating
UNIT 40 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 40-1) What is a communicating control system? In a communicating control system, the system components communicate over a serial network. Commands for different components can be sent over the same […]
Mechanical Engineering Unit 41 To 50 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) A method of measuring voltage across each component moving toward the malfunctioning load is called: A) Hopscotching. B) Home chaining. C) […]
Mechanical Engineering Unit 41 To 50 Flue Gas Condensation Can Prevented Running Dehumidifier The Room With The Furnace
289) 289) Flue gas condensation can be prevented by: A) Running a dehumidifier in the room with the furnace. B) Passing the combustion gases over a dehumidifier before sending them up the vent. C) Using single wall vent. D) Using […]
Mechanical Engineering Unit 41 To 50 Two Types Takeoff Fittings Available For Sheet Metal Duct Include Adhesive Backed
233) 233) Two types of takeoff fittings available for sheet metal duct include: A) Adhesive–backed flanges, trunk ducts with knock–outs. B) Dovetail, weld–on stubs. C) Weld–on stubs, preformed stubs. D) Dove tail, adhesive–backed flanges. Answer: D Explanation: A) B) C) […]
Mechanical Engineering Unit 41 To 50 What The Purpose The Hot Reactivation Air Stream Desiccant Wheel Dehumidifier Evaporate
78) 78) What is the purpose of the hot reactivation air stream in a desiccant wheel dehumidifier? A) To evaporate the water running over the wheel B) To dry out the saturated desiccant C) To heat the evaporator D) To […]
Mechanical Engineering Unit 41 To 50 Which Type Duct Undergoes More Rigorous Testing Before Labeled Galvanized Sheet Metal
154) 154) Which type of duct undergoes more rigorous testing before it is labeled? A) Galvanized sheet metal duct B) Flexible duct C) Polycarbonate molded duct D) Flexible duct connector Answer: B Explanation: A) B) C) D) 155) 155) A […]
Mechanical Engineering Unit 41 Unit Review Questions Answer Keygo Back Index List The Four Steps For
UNIT 41 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 41-1) List the four steps for isolating an electrical problem 1. Line voltage to the unit 2. Control voltage 3. Voltage to the nonfunctional component 4. Circuit to the nonfunctional […]
Mechanical Engineering Unit 42 Unit Review Questions Answer Keygo Back Index What Three Environmental Conditions Have
UNIT 42 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 42-1) What three environmental conditions have the most effect on comfort? Temperature, humidity, and air movement. 42-2) List four ways the human body expels heat? Conduction Convection Radiation Evaporation 42-3) […]
Mechanical Engineering Unit 43 Unit Review Questions Answer Keygo Back Index How Does Mechanical Filtration Workmechanical
UNIT 43 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 43-1) How does mechanical filtration work? Mechanical air filters work by passing the air and contaminants through a media. The contaminants get stuck in the fibers and the air passes […]
Mechanical Engineering Unit 44 Unit Review Questions Answer Keygo Back Index What The Difference Between Infiltration
UNIT 44 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 44-1) What is the difference between infiltration and exfiltration? Infiltration is air that leaks in; exfiltration is air that leaks out. 44-2) What is the difference between exhaust air and […]
Mechanical Engineering Unit 45 Unit Review Questions Answer Keygo Back Index List The Primary Advantages Room
UNIT 45 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 45-1) List the primary advantages of a room air conditioner. Room air conditioners are relatively low in cost, easy to install, and can be used in almost any type of […]
Mechanical Engineering Unit 46 What Are The Major Disadvantages Standalone Airconditioning Unitthe Type And Location The
45-12) What are the major disadvantages of a stand-alone air-conditioning unit? The type and location of the condenser. 45-13) Why are heat pumps often used on split systems? This is because heat can either be rejected or absorbed by the […]
Mechanical Engineering Unit 47 Unit Review Questions Answer Keygo Back Index Why Important Properly Plan The
UNIT 47 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 47-1) Why it is important to properly plan the installation of a residential split system air conditioner? Proper planning allows for an efficient and trouble-free installation. Without proper planning costly […]
Mechanical Engineering Unit 48 Unit Review Questions Answer Keygo Back Index What Standard Covers Ductboard And
UNIT 48 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 48-1) What standard covers ductboard and methods of connecting and sealing ductboard? Underwriters Laboratories 181 A 48-2) What standard covers flexible duct and methods of connecting and sealing flexible duct? […]
Mechanical Engineering Unit 49 Unit Review Questions Answer Keygo Back Index How The Temperature Drop Through
UNIT 49 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 49-1) How is the temperature drop through a DX coil on a split AC system determined? A sling or an electronic psychrometer is used to measure the return air dry […]
Mechanical Engineering Unit 5 Unit Review Questions Answer Keygo Back Index What Are The Typical Types
UNIT 5 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 5-1) What are the typical types of screws used on HVACR jobs? Typical types of screws are sheet metal screws, wood screws, and machine screws. 5-2) How are the length […]
Mechanical Engineering Unit 50 Unit Review Questions Answer Keygo Back Index Discuss The Origin Natural Gasdecomposition
UNIT 50 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 50-1) Discuss the origin of natural gas. Decomposition of organisms trapped in sedimentation at the bottom of the sea. Converted into gas and oil through pressure and heat. 50-2) List […]
Mechanical Engineering Unit 51 To 60 Common Ignition System Problem Incorrectly Set Barometric Damper Dirty Air Filterc Cracked
274) 274) A common ignition system problem is: A) Incorrectly set barometric damper. B) Dirty air filter. C) Cracked electrode insulators. D) Incorrectly settings on the fan cycling switch. Answer: C Explanation: A) B) C) D) 275) 275) Which type […]
Mechanical Engineering Unit 51 To 60 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) A Category IV furnace operates with a: A) High–temperature, negative–pressure vent. B) Low–temperature, positive–pressure vent. C) Low–temperature, negative–pressure vent. D) High–temperature, […]
Mechanical Engineering Unit 51 To 60 How Are Category Furnaces Generally Vented Stainless Steel Rigid Metal Flexible Foil
73) 73) How are Category IV furnaces generally vented? A) Stainless steel B) Rigid metal C) Flexible foil D) PVC venting Answer: D Explanation: A) B) C) D) 74) 74) If the temperature rise of a furnace is too low, […]
Mechanical Engineering Unit 51 To 60 The Indoor Fan Oil Furnace Controlled Temperature Sensing Fan Switch The Primary
153) 153) The indoor fan on an oil furnace is controlled by: A) A temperature–sensing fan switch. B) The primary control. C) A centrifugal switch on the oil burner motor. D) Either a temperature–sensing fan switch or the primary control. […]
Mechanical Engineering Unit 51 To 60 Which Part Will Need Cleaned There Excessive Soot Buildup Chimney Connector Suction
231) 231) Which part will need to be cleaned if there is excessive soot buildup? A) Chimney connector B) Suction line C) Oil tank D) Bypass plug Answer: A Explanation: A) B) C) D) 232) 232) How is mineral insulated […]
Mechanical Engineering Unit 51 Unit Review Questions Answer Keygo Back Index List The Four Categories Gas
UNIT 51 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 51-1) List the four categories of gas fired furnaces based on flue gas temperature and pressure. Category I, Category II, Category III, and Category IV 51-2) Explain the difference between […]
Mechanical Engineering Unit 52 Unit Review Questions Answer Keygo Back Index List The Four Areas Electronic
UNIT 52 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 52-1) List the four areas of an electronic control board that should be identified when troubleshooting. The input, output, board ground, and power supply. 52-2) What is a typical high […]
Mechanical Engineering Unit 53 Unit Review Questions Answer Keygo Back Index List The Safety Precautions That
UNIT 53 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 53-1) List the safety precautions that should be observed when starting a gas furnace. Don’t turn anything on until you have inspected the furnace! Check for the presence of gas […]
Mechanical Engineering Unit 54 Unit Review Questions Answer Keygo Back Index What The One Advantage Standing
UNIT 54 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 54-1) What is the one advantage of a standing pilot for a gas fired space heater? It does not require an outside source of electrical power to operate. 54-2) List […]
Mechanical Engineering Unit 55 Unit Review Questions Answer Keygo Back Index List The Grades Fuel Oil
UNIT 55 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 55-1) List the grades of fuel oil and give a brief description of each type. a. No 1 – kerosene, 100% light distillates, pours like water, clear, lowest heating value […]
Mechanical Engineering Unit 56 Unit Review Questions Answer Keygo Back Index How Does The Refractory Temperature
UNIT 56 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 56-1) How does the refractory temperature affect the combustion efficiency? The higher the refractory temperature, the higher the combustion efficiency. 56-2) What are normal on and off temperature ranges for […]
Mechanical Engineering Unit 57 Unit Review Questions Answer Keygo Back Index What Factors Should Considered When
UNIT 57 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 57-1) What factors should be considered when selecting an oil fired furnace? furnace location – determines configuration required heating capacity – determines firing rate and nozzle size desired efficiency size […]
Mechanical Engineering Unit 58 Unit Review Questions Answer Keygo Back Index What Indicated Frothy Stream Oil
UNIT 58 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 58-1) What is indicated by a frothy stream of oil in the oil supply line? A leak in the suction line allowing air bubbles in with theoil. 58-2) List the […]
Mechanical Engineering Unit 59 Unit Review Questions Answer Keygo Back Index What Restriction Considered When Installing
UNIT 59 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 59-1) What is a restriction to be considered when installing a gas room heater? Since air for combustion is supplied from the room air, these units must be installed in […]
Mechanical Engineering Unit 6 Unit Review Questions Answer Keygo Back Index What Are Four Physical Properties
UNIT 6 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 6-1) What are four physical properties of objects that can be measured? Distance, area, volume, and weight 6-2) What units are used to measure area? Squared units such as square […]
Mechanical Engineering Unit 60 Unit Review Questions Answer Keygo Back Index What Advantages Are There Adding
UNIT 60 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 60-1) What advantages are there to adding humidity to heated air? Adding humidity allows people to feel warm at lower temperatures, saving energy. Keeping the humidity between 30% and 60% […]
Mechanical Engineering Unit 61 To 70 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) What type of thermostat is typically used with electric baseboard heaters? A) Low–voltage thermostats B) Line–voltage thermostats C) Wireless thermostats D) […]
Mechanical Engineering Unit 61 To 70 The Most Common Problems Encountered With Basements Are Related The High Temperatures
228) 228) The most common problems encountered with basements are related to: A) The high temperatures normally encountered in basements. B) The unusually dry conditions normally encountered in basements. C) The difference in barometric pressure between the basement and the […]
Mechanical Engineering Unit 61 To 70 The Permanent Discharge Line Reversing Valve Always Located The Right The Side
74) 74) The permanent discharge line on a reversing valve is always located: A) On the right on the side with three large lines. B) On the left on the side with three large lines. C) In the middle on […]
Mechanical Engineering Unit 61 To 70 Why Mini Split Systems Cost Much Install The Design More Complex Than
286) 286) Why do mini–split systems cost so much to install? A) The design is more complex than a normal split system. B) They have to be connected to a home’s present wiring. C) There are more lines to install. […]
Mechanical Engineering Unit 61 To 70 Why Would Temperature Differential Defrost System Not Complete The Defrost Cycle There
154) 154) Why would a temperature–differential defrost system NOT complete the defrost cycle? A) There is a refrigerant undercharge. B) The fan blows warm air across the coil. C) There is too much heat available during defrost. D) The system […]
Mechanical Engineering Unit 61 Unit Review Questions Answer Keygo Back Index List Three Advantages Warm Air
UNIT 61 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 61-1) List three advantages of a warm air electric furnace as compared to an oil or gas furnace. It is more compact than the equivalent gas or oil furnace. Due […]
Mechanical Engineering Unit 62 Unit Review Questions Answer Keygo Back Index Why Should Furnaces Not Rest
UNIT 62 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 62-1) Why should furnaces not rest directly on the ceiling joists? The ceiling will act as a sounding board and transmit the blower sound throughout the house. 62-2) How is […]
Mechanical Engineering Unit 63 Unit Review Questions Answer Keygo Back Index List Three Ways Checking The
UNIT 63 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 63-1) List three ways of checking the heating elements of an electric furnace. Amperage draw, resistance check, visual inspection 63-2) Describe how a clamp on ammeter can be used to […]
Mechanical Engineering Unit 64 Unit Review Questions Answer Keygo Back Index List The Types Heat Pumps
UNIT 64 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 64-1) List the types of heat pumps available by combinations of heat source and heat sink. Air to air, water to air, air to water, water to water 64-2) Why […]
Mechanical Engineering Unit 65 Unit Review Questions Answer Keygo Back Index What Type Heat Pump The
UNIT 65 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 65-1) What type of heat pump is the most common and why? Air to air heat pumps are the most common heat pumps in use today because they are generally […]
Mechanical Engineering Unit 66 Unit Review Questions Answer Keygo Back Index What The Difference Between Water
UNIT 66 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 66-1) What is the difference between a water source heat pump and an air source heat pump? Instead of two air coils, water-to-air heat pumps use one water coil and […]
Mechanical Engineering Unit 67 Unit Review Questions Answer Keygo Back Index List The Types Air Source
UNIT 67 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 67-1) List the types of air source packaged heat pumps. Side discharge, bottom discharge (curb mount), or wall mount 67-2) Give a common application for horizontal water source heat pumps. […]
Mechanical Engineering Unit 68 Unit Review Questions Answer Keygo Back Index What Indicated Higher Than Normal
UNIT 68 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 68-1) What is indicated by a higher than normal temperature rise across the indoor coil in the heating cycle? Reduced airflow 68-2) How often should throwaway filters be checked? Once […]
Mechanical Engineering Unit 69 Unit Review Questions Answer Keygo Back Index What The Standard Ceiling Height
UNIT 69 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 69-1) What is the standard ceiling height in a residence? 8 feet 69-2) Name the two most common problems with basements. Moisture and mold growth 69-3) Name the reinforcement materials […]
Mechanical Engineering Unit 7 Unit Review Questions Answer Keygo Back Index What Matteranything That Has Mass
UNIT 7 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 7-1) What is matter? Anything that has mass and takes up space. 7-2) What is the difference between an atom and molecule? An atom is the smallest piece of an […]
Mechanical Engineering Unit 70 Unit Review Questions Answer Keygo Back Index According The Department Energy The
UNIT 70 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 70-1) According to the Department of Energy, the combined impact of all buildings, both commercial and residential accounts for more than % of all electricity usage and % of all […]
Mechanical Engineering Unit 71 To 80 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) Infrared cameras are used to check: A) Thermal leakage. B) Percentage of CO2. C) CO parts per million. D) Air particle […]
Mechanical Engineering Unit 71 To 80 The Electrical Disconnect Box For Rooftop Unit Mounted The Unit Not Required
222) 222) The electrical disconnect box for a rooftop unit is: A) Mounted on the unit. B) Not required for rooftop installations. C) Mounted on a separate post next to the unit. D) Located inside to protect it from the […]
Mechanical Engineering Unit 71 To 80 Variable Air Volume Zone System Can Match The Airflow And System Capacity
75) 75) A variable–air–volume zone system can: A) Match the airflow and system capacity to the load. B) Overblow a zone if only one zone is calling. C) Require more bypass air than a traditional zone system. D) Allow the […]
Mechanical Engineering Unit 71 To 80 What Should Always Running When The Chiller Operating Chilled Air Handler Fan
154) 154) What should always be running when the chiller is operating? A) Chilled air–handler fan B) Cooling tower fan and damper C) Mixed–air damper outlet D) Condenser–cooling water pump Answer: D Explanation: A) B) C) D) 155) 155) What […]
Mechanical Engineering Unit 71 Unit Review Questions Answer Keygo Back Index Define Indoor Air Qualityindoor Air
UNIT 71 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 71-1) Define Indoor Air Quality. Indoor air quality is the state of the air contained within an enclosed building. 71-2) What needs to be addressed to achieve acceptable indoor air […]
Mechanical Engineering Unit 72 What The Viral Disease That Certain Mice Can Carryhantavirus Why Necessary For
71-19) What is the viral disease that certain mice can carry? Hantavirus 71-20) Why is it necessary for a HVACR technician to understand the building systems? The interaction of the building and its associated systems plays a large role in […]
Mechanical Engineering Unit 73 Unit Review Questions Answer Keygo Back Index What Friction Rate Should Used
UNIT 73 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 73-1) What friction rate should be used to size a duct for a static pressure drop of 0.1” WC if the duct has a total equivalent length of 150 feet? […]
Mechanical Engineering Unit 74 Unit Review Questions Answer Keygo Back Index Why Are Zone Control Systems
UNIT 74 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 74-1) Why are zone control systems used? Zone systems allow control over different portions of the house without installing multiple units. This improves overall comfort, saves energy, and reduces installation […]
Mechanical Engineering Unit 75 Unit Review Questions Answer Keygo Back Index List Types Measurements Used Perform
UNIT 75 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 75-1) List 6 types of measurements used to perform TAB procedures. Temperature Measurements, Enthalpy Measurements, Pressure Measurement, Air Flow, Electrical Measurements, Rotation Measuring 75-2) List 5 instruments are used in […]
Mechanical Engineering Unit 76 Unit Review Questions Answer Keygo Back Index Define Residential Air Conditioningthis Category
UNIT 76 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 76-1) Define residential air conditioning. This category generally includes single family, multifamily, and low-rise multi- family private household residences. 76-2) List at least 5 types commercial air conditioning applications. Hotels […]
Mechanical Engineering Unit 77 Unit Review Questions Answer Keygo Back Index Although Air Handler Cabinets May
UNIT 77 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 77-1) Although air handler cabinets may be made of galvanized steel, there are still areas that may be subject to corrosion. Why? The sheet metal edge where the steel is […]
Mechanical Engineering Unit 78 Unit Review Questions Answer Keygo Back Index Describe One Method Determine Ladder
UNIT 78 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 78-1) Describe one method to determine if a ladder is correctly set up. One method is that for every 4 feet that the ladder is extended, it should be 1 […]
Mechanical Engineering Unit 79 Unit Review Questions Answer Keygo Back Index Why Outside Air Mixed With
UNIT 79 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 79-1) Why is outside air mixed with return air? If only outside air was used, then the load on the heating or cooling system would be excessive. 79-2) How much […]
Mechanical Engineering Unit 8 Unit Review Questions Answer Keygo Back Index List The Forms Energy Used
UNIT 8 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 8-1) List the forms of energy used in the heating, air-conditioning, and refrigeration industry. Chemical, Thermal (Heat), Radiant (Light), Electrical, Magnetic, Mechanical 8-2) What units are used to measure heat […]
Mechanical Engineering Unit 80 Unit Review Questions Answer Keygo Back Index What The Function Low Temperature
UNIT 80 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 80-1) What is the function of a low temperature thermostat on a packaged air handler? It will be set to shut down the fan and set off an alarm if […]
Mechanical Engineering Unit 81 To 92 Exam Namemultiple Choice Choose The One Alternative That Best Completes The Statement
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) How can the centrifugal compressor speed be higher than the motor speed? A) By using a drive belt with a larger […]
Mechanical Engineering Unit 81 To 92 Suction Line Filters Are Generally Designed Stay The System Permanently Once Installed
231) 231) Suction line filters are generally designed: A) To stay in the system permanently once installed. B) For biflow capability in heat pumps. C) To be interchangeable with liquid line driers. D) To be removed after the system is […]
Mechanical Engineering Unit 81 To 92 The Coil Potential Relay Used With Small Single Phase Compressors Should Have
383) 383) The coil of a potential relay used with small single–phase compressors should have a resistance of approximately: A) 1 . B) 50 . C) 10,000 . D) 250 . Answer: C Explanation: A) B) C) D) 384) 384) […]
Mechanical Engineering Unit 81 To 92 The Normal Fluid Temperature Drop Through Glycol Coil Secondary Cooling Loop Answer
157) 157) The normal fluid temperature drop through a glycol coil on a secondary cooling loop is: A) 20°F. B) 15°F. C) 5°F. D) 10°F. Answer: D Explanation: A) B) C) D) 158) 158) An electric defrost cycle is accomplished […]
Mechanical Engineering Unit 81 To 92 Weeping Relief Valve Hot Water Boiler May Indication Low Return Water Temperature
80) 80) A weeping relief valve on a hot water boiler may be an indication of: A) Low return water temperature. B) A water–logged expansion tank problem. C) An extinguished pilot light. D) A circulating pump that is running continuously. […]
Mechanical Engineering Unit 81 To 92 What May Safely Used Check System For Leaks Pressures Around Psig Hydrogen
310) 310) What may be safely used to check a system for leaks at pressures of around 100 psig? A) Hydrogen B) Nitrogen C) Oxygen D) Neon Answer: B Explanation: A) B) C) D) 311) 311) Placing equipment directly on […]
Mechanical Engineering Unit 81 Unit Review Questions Answer Keygo Back Index Describe The Difference Between Flooded
UNIT 81 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 81-1) Describe the difference between a flooded and a dry (direct expansion) type cooler. In a flooded cooler the refrigerant surrounds the outside of the tubes and the chilled water […]
Mechanical Engineering Unit 82 Unit Review Questions Answer Keygo Back Index Define Hydronicshydronics Can Defined Science
UNIT 82 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 82-1) Define hydronics. Hydronics can be defined as a science that utilizes water or steam to transfer heat from the source where it is produced, to an area where it […]
Mechanical Engineering Unit 83 Unit Review Questions Answer Keygo Back Index When Would Steam Boiler Preferable
UNIT 83 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 83-1) When would a steam boiler be preferable over a hot-water-type boiler? When large amounts of heat need to be transferred, the boiler is used to produce steam. This is […]
Mechanical Engineering Unit 84 Unit Review Questions Answer Keygo Back Index What Are The Two Common
UNIT 84 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 84-1) What are the two common mechanical draft cooling tower arrangements? Mechanical draft towers are categorized as either being induced draft or forced draft. 84-2) How does an induced draft […]
Mechanical Engineering Unit 85 Unit Review Questions Answer Keygo Back Index What Are Three Important Items
UNIT 85 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 85-1) What are three important items to consider in the design of commercial refrigeration systems? The equipment design must ensure that the quality of the product being cooled remains satisfactory, […]
Mechanical Engineering Unit 86 Unit Review Questions Answer Keygo Back Index What The Most Common Type
UNIT 86 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 86-1) What is the most common type of system used in “traditional” supermarkets? Multiple direct expansion systems (Multiplex) 86-2) How many compressors are typically found on a compressor rack? Most […]
Mechanical Engineering Unit 87 Unit Review Questions Answer Keygo Back Index List Eight Applications For Commercial
UNIT 87 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 87-1) List eight applications for commercial ice machines. Restaurants, institutional kitchens, cafeterias, correctional foodservice, hotels, hospitals, theme parks, resorts, casinos, cruise ships. 87-2) How much ice will a 12 ounce […]
Mechanical Engineering Unit 88 Unit Review Questions Answer Keygo Back Index What Are The Two Areas
UNIT 88 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 88-1) What are the two areas into which electrical troubleshooting can be divided? 1) electrically diagnosing controls (switches, relays and contactors); and 2) electrically diagnosing loads (coils, fan motors and […]
Mechanical Engineering Unit 89 Unit Review Questions Answer Keygo Back Index List The Associations That Establish
UNIT 89 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 89-1) List the associations that establish national standards for the HVACR industry. ARI – Air Conditioning and Refrigeration Institute ASHRAE American Society of Heating Refrigeration and Air Conditioning Engineers ASME […]
Mechanical Engineering Unit 9 Unit Review Questions Answer Keygo Back Index What Temperaturetemperature The Measure The
UNIT 9 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 9-1) What is temperature? Temperature is the measure of the average kinetic energy in a substance. 9-2) What is the first color of light that can be seen when a […]
Mechanical Engineering Unit 90 Unit Review Questions Answer Keygo Back Index List The Four Phases Planned
UNIT 90 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 90-1) List the four phases of a planned maintenance service call. Routine maintenance, pre-start inspection, operational checks, troubleshooting 90-2) What is the purpose of checking the supply voltage both before […]
Mechanical Engineering Unit 91 Unit Review Questions Answer Keygo Back Index What Are The Most Common
UNIT 91 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 91-1) What are the most common types of refrigeration system contaminants introduced because of improper installation? Common installation related contaminants include carbon, oxides, air, and water. 91-2) How does carbon […]
Mechanical Engineering Unit 92 Unit Review Questions Answer Keygo Back Index List Some Common Questions Customers
UNIT 92 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX 92-1) List some common questions customers ask service technicians. How is the equipment supposed to operate? What is the equipment doing wrong? What is the root cause of the problem? […]