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.
8-2) What units are used to measure heat quantity?
8-3) What units are used to measure heat intensity?
8-4) Explain the relationship between energy, work, and power.
8-5) How many BTUs will a 5-killowatt heater produce if operated for an hour?
8-6) How many BTUs are required to raise the temperature of 15 pounds of water
from 100° F to 120°F?
8-7) A heat transfer process results in 20 kilocalories of heat being absorbed by one
liter (1 kilogram) of water. What temperature will the water be if it started at a
temperature of 25°C?
8-8) Describe chemical energy and give an example.
8-9) How much mechanical force is required to lift a 250-pound compressor 2 feet?
8-10) What energy unit is used today in the SI system for all forms ofenergy?
8-11) How many joules of heat does a 100-watt heater produce if it is operated for 5
minutes?
8-12) Use a block diagram to outline a common electrical distribution system from
the power plant to your house.
ELECTRICAL POWER PLANT
8-13) What units of measurement are used in the United States to rate the cooling
capacity of conditioning equipment?
8-14) Arrange the following heat quantities from smallest to largest.
Joule
8-15) Explain the difference between a renewable energy resource and a
nonrenewable energy resource.
8-16) Explain the difference between potential and kinetic energy.
8-17) Describe the natural gas distribution system.
A large network of pipelines. Compressors are used to reduce the gas volume
and provide enough pressure to move the gas through the pipelines. The
House
Pole Transformer
Transformed down to
240 volts
Substation
Transformed
down to
4.8 kilovolts
Generator
30 kilovolts
Lon
g
transmission lines
Transformed
up to
69 kilovolts
21
pressures in the main pipelines are as high as 1500 psig, but the pressures are
reduced before entering local distribution system lines.
8-18) Explain the relationship between watts and joules in the SI system.
8-19) What is the required input in watts to operate an 80-percent efficient 5 hp
electric motor?
8-20) Explain the units used to measure torque.