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Process Technology Equipment, 2e (NAPTA)
Chapter 8 Turbines
1) Which of the following is one of the most common types of turbines?
A) Gas
B) Wind
C) Electric
D) Hydraulic
2) What class of turbine uses Newton's third law of motion?
A) Impulse turbines
B) Reactive turbines
C) Momentum turbines
D) Pressure turbines
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3) When is a reactive design typically used?
A) High-pressure fluids
B) Lower-pressure fluids
C) High-viscosity fluids
D) Low-viscosity fluids
4) Which of the following is an example of a reactive turbine?
A) Pelton wheel turbine
B) Kaplan turbine
C) Curtis turbine
D) Francis turbine
5) Which of the following is an advantage of steam turbines over electrical equipment?
A) They are free from sparks.
B) They are not useful in areas where volatile substances are produced.
C) They require electricity to run.
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6) What is a device in which exhaust steam is condensed in a surface condenser, and the
condensate is then recycled to the boiler?
A) Multistage steam turbine
B) Single-stage steam turbine
C) Condensing steam turbine
7) What is a device that contains one set of blades?
A) Multistage steam turbine
B) Single-stage steam turbine
C) Condensing steam turbine
D) Noncondensing steam turbine
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8) What component of a steam turbine is the housing around the internal components of a
turbine?
A) Shaft
B) Casing
C) Steam chest
9) What is designed to increase the velocity of steam?
A) Governor
B) Rotor
C) Nozzle
D) Trip and throttle valve
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10) Which of the following is a major component of combustion gas turbines?
A) Air inlet
B) Axial air compressor
C) A combustion chamber
11) What happens if water droplets are in the incoming steam of a steam turbine?
A) It will cause the turbine casing to heat.
B) It will cause the pressure to drop.
C) It will cause bearing damage.
D) It can cause severe vibration problems.
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12) What is the first stage of the Brayton cycle?
A) Expansion
B) Compression
C) Heat addition
13) What is the fourth stage of the Brayton cycle?
A) Expansion
B) Compression
C) Heat addition
D) Heat rejection
14) What can cause loss of lubrication?
A) Vibration
B) Oil pump failure
C) Excessive temperatures
D) Abnormal conditions
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15) What is caused by mineral deposits from the steam?
A) Pitting
B) Fouling
C) Erosion
D) Impingement
16) What occurs when the steam quality decreases to the point that steam condensate exists in
the turbine?
A) Pitting
B) Fouling
C) Erosion
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17) Which of the following improper operations can cause burns by exposure to heat or steam?
A) High-discharge steam pressure
B) Failure to avoid critical speeds
C) Failure to maintain sufficient inlet steam pressure
D) Uninsulated equipment and piping
18) Which of the following should a process technician monitor?
A) Oil levels
B) Safety interlocks and devices
C) Inlet and exhaust steam temperatures
D) All of the above
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19) What should be used to reduce the risk of parts fusing together?
A) Bearings
B) Wet steam
C) High-quality oil
D) Hunting
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) Unblock the high-pressure steam.
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21) Which of the following is a typical step in the shutdown procedures for a steam turbine?
A) Slow roll the steam turbine.
B) Adjust turbine speed.
C) Switch to the spare turbine.
D) Unblock the high-pressure steam.
