Gas Turbine Principles and Designs
Chapter 4 Exam Questions and Answers
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Automatic emergency trips shut off the main fuel valve in the event of:
a. High exhaust temperatures.
b. Differential pressures are too high across the filters.
c. Inlet air temperatures exceed maximum.
d. Compressor discharge pressures are too high.
e. Compressor discharge temperatures are too high. - ✔✔A
Industrial gas turbines are used for a wide variety of applications such as:
1. Portable generators.
2. Fire pumps.
3. Air compressors.
4. Emergency equipment.
a. 1, 2, 3
b. 1, 2, 4
c. 1, 3, 4
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,d. 1, 2, 3, 4
e. 2, 3, 4 - ✔✔D
Gas Turbines enclosures are used to:
1. Protect equipment from the elements.
2. Allows the incorporation of heat and gas detectors.
3. Contains the gas turbine DCS controls.
4. Keep the turbine from cooling down, more efficient.
5. Provides ventilation systems.
a. 1,2,3
b. 1,2,5
c. 2,3,4
d. 2,3,5
e. 3,5,1 - ✔✔B
The operating output of a gas turbine is affected the most by changing:
a. The inlet air temperature.
b. The heat valve of the fuel.
c. The gas pressure to the combustors.
d. The combustion flame pattern.
e. From base loading to peak loading. - ✔✔A
The advantages of centrifugal over axial compressors are:
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,1. High capacity.
2. Short length.
3. High flow rates.
4. Strength.
5. Adjustable flow.
a. 1,2
b. 2,3
c. 3,4
d. 4,5
e. 2, 4. - ✔✔E
Gas turbines are far superior to other mechanical engines in:
a. Fuel consumption.
b. Efficiency.
c. Lubricating oil consumption.
d. Power per mass ratio.
e. Fuel usage. - ✔✔D
A closed cycle gas turbine system:
a. Does not use a starting motor.
b. Has lower pressure used in system.
c. Will use the same working fluid over again.
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, d. Must use a cooler before the regeneration.
e. Has a lower initial cost than that of the open cycle gas turbine. - ✔✔C
The compressor on a gas turbine:
a. Can be driven by the load turbine.
b. Is always of the axial type.
c. Is always multi-stage.
d. Is always of the reciprocating type.
e. Is always of the centrifugal type - ✔✔A
The advantages of gas turbines are:
1. Remote operation capability.
2. Simple compact design.
3. Quick start time.
4. High thermal efficiency.
a. 1,2,3
b. 1,3,4
c. 2,3,4
d. 1,2,4
e. 1,2,3,4. - ✔✔A
Modern gas turbines have the following advantages:
1. High power to weight ratio.
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