Process Technology Equipment
Chapter 8 Turbines
8. What component of a steam turbine is the area in a turbine where steam
enters, and the steam strainer removes impurities from steam?
A. Shaft
B. Casing
C. Steam chest
D. Governor
9. What is designed to control the speed of the turbine?
A. Governor
B. Rotor
C. Nozzle
D. Trip and throttle valve
Process Technology Equipment
Chapter 8 Turbines
Page 20
10. Which of the following is a major component of combustion gas turbines?
A. Exhaust flue ducting
B. A turbine powering the drive shaft
C. A turbine powering the axial compressor
D. All of the above
11. What can minimize the vibration caused by thrust?
A. Lubrication
B. Thrust bearings
C. Radial bearings
D. Mechanical fly ball device
12. What is the second stage of the Brayton cycle?
Process Technology Equipment
Chapter 8 Turbines
A. Expansion
B. Compression
C. Heat addition
D. Heat rejection
13. What is the third stage of the Brayton cycle?
A. Expansion
B. Compression
C. Heat addition
D. Heat rejection
14. What can cause bearing damage?
A. Corrosion
B. Oil pump failure
C. Excessive temperatures
D. Abnormal conditions
Process Technology Equipment
Chapter 8 Turbines
Page 22
15. What is a form of localized corrosion that creates small holes in metal
components?
A. Pitting
B. Fouling
C. Erosion
D. Impingement
16. What occurs as a result of damage that takes place when the turbine is not
running?
A. Pitting
B. Fouling
C. Erosion
D. Impingement
Process Technology Equipment
Chapter 8 Turbines
Page 23
17. Which of the following improper operations does not pose a hazard of turbine
shutdown?
A. Steam leaks
B. High-discharge steam pressure
C. Failure to maintain sufficient inlet steam pressure
D. Running a turbine at a speed above or below the normal operating conditions
18. Which of the following should a process technician monitor?
A. Oil levels
B. Speed governor lubrication
C. Inlet and exhaust pressures
D. All of the above
19. What can vibrations indicate in regard to a turbine?
Process Technology Equipment
Chapter 8 Turbines
Page 24
A. A turbine shaft problem
B. Elevated temperatures
C. High bearing temperatures
D. High turbine operating speeds
20. Which of the following is a typical step in the start-up procedures for a
noncondensing steam turbine?
A. Switch to the spare turbine.
B. Close the inlet valve.
C. Close the outlet steam valve.
D. Open turbine case drains.
21. Which of the following is a typical step in the shutdown procedures for a
steam turbine?
A. Adjust turbine speed.
B. Close the inlet valve.
C. Open the low-pressure steam valve slightly.
Process Technology Equipment
Chapter 8 Turbines
Page 25
D. Verify the lube oil and cooling water are in service.
1. What is the basic principle of turbines?
A. They utilize fluid force to turn a rotor.
B. They convert potential energy into kinetic energy.
C. They convert mechanical energy into kinetic energy.
D. They convert mechanical energy into potential energy.
2. Which class is a steam turbine considered to be classified in?
A. Impulse
B. Reactive
Process Technology Equipment
Chapter 8 Turbines
C. Combination
D. All of the above
3. What is the most common water turbine in use today?
A. Pelton wheel turbine
B. Kaplan turbine
C. Curtis turbine
D. Francis turbine
4. What occurs when a turbine has shut down due to abnormal conditions?
A. Corrosion
B. Turbine trip
C. Bearing damage
D. Turbine overspeeding
Process Technology Equipment
Chapter 8 Turbines
Page 27
5. What can warped parts in a boiler operation lead to?
A. Hunting
B. Turbine shutdown
C. Loss of boiler feedwater
D. Abnormal steam emissions
Process Technology Equipment
Chapter 8 Turbines
Page 28
APPENDIX, Chapter 8
Table of Contents
Contents
Page
Checking Your Knowledge Answer Key
29
Process Technology Equipment
Chapter 8 Turbines
Page 29
1. Define the following terms:
a. Gas turbine
b. Hydraulic turbine
c. Reactive turbine
d. Steam turbine
e. Wind turbine
f. Impulse turbine
g. Casing
h. Governor
i. Fixed blade
j. Moving blade
k. Nozzle
l. Overspeed trip mechanism
m. Rotor
Process Technology Equipment
Chapter 8 Turbines
2. (True or False) Gas and steam turbines are activated by the expansion of fluid
on a series of curved rotor vanes attached to a central shaft.
3. Steam turbines are driven by the pressure of high-velocity ______ discharged
at a high pressure and temperature against the turbine vanes.
a. air
b. water
c. gas
d. steam
4. (True or False) Newton’s third law of motion states that for every action, there
is a lesser but similar reaction.
Process Technology Equipment
Chapter 8 Turbines
Page 31
5. A(n) ______ turbine is used as a driver for high-differential pressure and high
horsepower, and it can use different pressures at various inlet points to drive
process equipment.
a. condensing
b. noncondensing
c. multistage
d. impulse
6. A(n) ______ is used to control the speed of the turbine as steam is channeled
through the restrictive component called the nozzle.
a. governor
b. trip and throttle valve
c. thrust bearing
d. overspeed trip
7. Inside a gas turbine, hot gases are produced in the ______ and are directed
toward the turbine blades, causing the rotor to move.
Process Technology Equipment
Chapter 8 Turbines
Page 32
a. fuel line
b. combustion chamber
c. stage
d. compressor
8. Turbines can be powered by which of the following? (Select all that apply.)
a. Steam
b. Gas
c. Liquid (hydraulic)
d. Wind
9. Which of the following is true of a noncondensing steam turbine? (Select all
that apply.)
a. It is also called a back-pressure turbine.
b. The condensate is recycled to the boiler.
c. It functions like a pressure-reducing valve.
d. Steam exits the turbine at a lower pressure.
Process Technology Equipment
Chapter 8 Turbines
10. (True or False) Labyrinth seals are single-layer seals used to allow small
amounts of leakage inside the turbine.
11. _____________ valves are safety valves used to warn process technicians of
equipment overpressurization.
12. During what stage of a combustion gas turbine can heat recovery take place?
a. Compression
b. Heat addition
c. Expansion
d. Heat rejection
Process Technology Equipment
Chapter 8 Turbines
Page 34
13. Turbine ____________ is caused by mineral deposits from steam.
14. What equipment hazards are associated with a failure to maintain sufficient
inlet steam pressure? (Select all that apply.)
a. Hunting
b. Machine failure
c. Relief valve popping
d. Turbine shutdown
15. List three things a process technician should monitor with regard to turbines.
Process Technology Equipment
Chapter 8 Turbines
Page 35
16. Place the following noncondensing steam turbine startup procedures in order.
____ Verify the lube oil and cooling water are in service.
____ Communicate with the team that the turbine is ready.
____ Open turbine case drains.
____ Slow roll the steam turbine.
____Observe the steam coming out of the drains and, when it becomes dry, completely
open the low-pressure steam valve and close the drain valve.
____ Unblock the high-pressure steam.
____ Ensure that the driven equipment connected to the steam turbine is ready for
startup.
____ Adjust turbine speed as needed.
____ Open the low-pressure steam valve slightly
Page Reference: 179