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Chapter 6
TURBINES AND MOTORS
OBJECTIVES
After studying this chapter, the student will be able to:
▪ Identify the different kinds of turbines.
▪ Review the history of steam turbines.
▪ Describe the operating principles and components of a steam turbine.
▪ Describe the types of steam turbines.
CHAPTER 6 REVIEW QUESTIONS
1. What is a governor valve? Answer: A governor valve is an automatic valve that regulates
2. Describe heat soaking and slow roll. Answer: Heat soaking is a procedure designed to
3. What does the term hunting mean? Answer: Hunting occurs when a turbine's speed
4. Describe the main difference between reaction and impulse steam turbines. Answer:
Impulse and reactive steam turbines operate under similar principles. Impulse movement
5. What is a labyrinth seal? Answer: A shaft seal designed to stop steam flow axially out of
6. Describe how the nozzle works on a steam turbine. Answer: The nozzle or nozzle block
7. What is an overspeed trip? Answer: A safety device used to shut down the turbine when
8. Explain how a gas turbine operates. Answer: A gas turbine is a device that uses high-
pressure combustion gases to turn a series of turbine wheels to provide rotational energy
9. Describe the application of safety relief valves to steam turbines. Answer: A safety relief
10. Explain how an electric motor operates. Answer: The operation of an electric motor is
11. Describe why a throttle valve is important to steam turbine operation. Answer: The
12 What is the function of a steam strainer? Answer: The steam strainer is designed to
13. List the components of a steam turbine. Answer:
a. Steam chest
b. Nozzles & nozzle block
g. Thrust bearings
h. Carbon rings
i. Shaft seals
14. What is the primary function of radial and axial bearings? Answer: Prevent radial and
15. Explain the operation and function of a steam turbine steam chest. Answer: The steam
16. Describe the purpose and operation of a governor system. Answer: The governor system
is designed to control the speed of the steam turbine. The key components of the
17. Why is vibration monitoring in a steam turbine important? Answer: Excessive vibration
18. Describe how a steam turbine is started up. Answer: See procedure in textbook.
