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CHAPTER 6 TURBINES AND MOTOR TEST
1. All of the following are examples of turbine vibration except:
a. radial vibration
b. axial vibration
c. inboard outboard bearing vibration
d. stem vibration
2. Excessive vibration could indicate all of the following except:
a. failing radial bearings
b. failing axial bearings
c. failed labyrinth seals
d. failed journal bearings
e. failed carbon rings
f. failed stator seals
3. An automatic valve that regulates the amount of steam admitted into a turbine is called the.
a. steam regulator
b. overspeed trip
c. throttle valve
d. governor valve
4. A safety device used to shutdown a turbine when it exceeds rotational limits is called a:
a. overspeed trip
b. safety trip lever
c. throttle valve
d. governor valve
5. A typical governing system is divided into all of the following parts except:
a. speed sensitive
b. motion sensor amplifier to control valve
c. hydraulic sensitive electronics
d. control valve
6. The lube oil system in a steam turbine lubricates bearings and gears, cools lubricated parts and
acts as a hydraulic medium for the governor.
a. true
b. false
7. The bearing that keeps the shaft from moving from side to side is called the:
a. thrust bearings
b. labyrinth bearings
c. radial bearings
d. mechanical bearings
8. The bearing that keeps the shaft from moving horizontally is called the:
a. axial bearings
b. labyrinth bearings
c. radial bearings
d. mechanical bearings
9. Select the four basic types of steam turbines.
a. condensing and non-condensing
b. steam and water
c. impulse and reactive
d. gas and wind
10. In a steam turbine, the rotation of the blades in response to the steam is called:
a. impulse motion
b. rotor alignment
c. kinetic-mechanical energy conversion
d. impulse movement
11. The amount of steam energy needed to perform useful work depends upon the pressure range
through which the turbine expands.
a. true
b. false
12. Giovanni di Branca designed the first impulse steam turbine in:
a. 1534 AD
b. 1629 AD
c. 1765 AD
d. 1876 AD
13. The fixed blades in a steam turbine form a:
a. quarter crescent
b. half moon
c. three quarter moon
d. full moon
14. Identify the main parts of a gas turbine.
14-1____________ 14-2____________ 14-3____________
14-4____________ 14-5____________ 14-6____________
14-7____________ 14-8____________ 14-9____________
14-10___________ 14-11___________ 14-12___________
15. A procedure designed to remove condensate from a steam turbine, warm the internal parts and
slow roll the turbine by bringing up the speed slowly is called:
a. heat soaking
b. thermal conditioning
c. hunting
d. global rotation
16 A shaft seal designed to stop flow consisting of a series of ridges and intricate paths is called a:
a. ridge seals
b. labyrinth seals
c. packing seals
d. mechanical seals
17. A device used to connect the drive shaft of a motor or steam turbine to a pump, compressor or
generator.
a. alignment connector
b. spider gear
c. coupling
d. quick slip connection
18. Identify the main parts of a steam turbine.
18-1__________ 18-2__________ 18-3__________ 18-4__________
18-5__________ 18-6__________ 18-7__________ 18-8__________
18-9__________ 18-10_________ 18-11_________ 18-12_________
18-13_________ 18-14_________ 18-15_________ 18-16_________
18-17_________
19. Steam enters a steam turbine at temperatures in excess of:
a. 500 F
b. 750 F
c. 1000 F
d. 1500 F
20. Steam entry pressures into a steam turbine reach:
a. 1250 psi
b. 1750 psi
c. 2550 psi
d. 3500 psi
21. The basic components of a gas turbine system include all of the following except:
a. a compressor
b. combustion chamber
c. a pump
d. a gas turbine
11. A gas turbine is a device that:
a. uses high-pressure combustion gases to turn a turbine
b. uses low-pressure combustion gases to turn a turbine
c. uses high-pressure air from a compressor to turn a turbine
d. uses an axial compressor to lift pistons in the turbine engine
23. In a steam turbine high velocity steam flows through the nozzle and is directed against a set of
fixed blades.
a. true
b. false
24. Turbines convert __________ __________ into useful mechanical energy that is used to drive
rotating equipment.
a. electrical energy
b. steam energy
c. radiant energy
d. turbo-electric energy
25. Shaft seals are located at the ends of each casing to minimize outward leakage of steam under
pressure and enhance inward air leakage.
a. true
b. false
26. Modern turbine design _________ the size of each stage giving the turbine a _________ shape.
a. increases, conical
b. decreases, conical
c. holds constant, tubular
27. Two different types of governor systems used on steam turbines include all of the following
except:
a. electronic hydraulic speed control
b. mechanical hydraulic speed control
c. instrument control distributive control system
28. Identify the main parts of an electric motor.
28-1__________ 28-2__________ 28-3__________
28-4__________ 28-5__________ 28-6__________
29. As the steam zig-zags between the stationary and moving blades it begins to expand as much as
________ times its original volume.
a. 50
b. 100
c. 200
d. 1000
30. When a steam turbine speeds up or slows down while the controller searches for the correct
operating speed is called:
a. searching
b. hunting
c. surging
d. slipping
31. The maximum pressure delta ∆ across a steam turbine is:
a. 1050 psi
b. 1550 psi
c. 2350 psi
d. 3300 psi
32. Modern turbine technology includes _____ or more stages linked axially along a horizontal shaft.
a. 10
b. 30
c. 50
d. 70
33. In a steam turbine high pressure steam energy is converted to kinetic energy.
a. true
b. false
34. The correct path for steam flow into and out of a steam turbine is:
a. throttle valve, steam chest, governor valve, nozzle, moving blades, fixed blades, moving
blades, steam outlet
b. governor or throttle valve, nozzle block, rotor, casing outlet
c. steam chest, throttle valve, nozzle, moving blades, fixed blades, moving blades, casing
outlet
d. throttle valve, steam chest and governor system, nozzle, moving blades, fixed blades,
moving blades, steam outlet
Answer Key Chapter Six Steam Turbines
