A disadvantage of the gas turbine is?

A disadvantage of the gas turbine is?

a. High cost
b. High maintenance
c. Requires a lot of cooling water
d. Low thermal Efficiency






Answer: D

Approximately __ of the power produced by a gas turbine is used to drive the turbine compressor.

Approximately __ of the power produced by a gas turbine is used to drive the turbine compressor.

a. 1/4
b. 2/4
c. 2/3
d. 1/3
e. 3/4





Answer: C

The hot air from the gas turbine combustor is expanded through the:

The hot air from the gas turbine combustor is expanded through the:

a. The compressor
b. A reciprocating piston chamber
c. The turbine blading
d. The intercooler




Answer: C

In a simple gas turbine, air is first drawn into the compressor and compressed. It is then discharged from the compressor to the:

In a simple gas turbine, air is first drawn into the compressor and compressed. It is then discharged from the compressor to the:

a. Combustor
b. Turbine
c. Reciprocating piston
d. Heat recovery steam generator





Answer: A

Some of the characteristics which make the gas turbine a better choice over other prime movers are: 1. low maintenance 2. minimum cooling water 3. high thermal efficiency 4. rapid start-up and loading

Some of the characteristics which make the gas turbine a better choice over other prime movers are:
1. low maintenance
2. minimum cooling water
3. high thermal efficiency
4. rapid start-up and loading

a) 1, 2, 3, 4
b) 1, 2, 3
c) 1, 2, 4
d) 1, 3, 4
e) 2, 3, 4





Answer: C

The temperature to which the air can be raised at the turbine inlet is

The temperature to which the air can be raised at the turbine inlet is

a) an indication of a unit's power
b) directly related to the unit's size
c) a function of the air compressor input
d) an indication of the unit's efficiency
e) important for proper compressor performance





Answer: D

Gas turbines are ideal when considering

Gas turbines are ideal when considering

a) long warm-up periods
b) emergency power generation
c) automotive power
d) cooling water pump operation
e) good thermal efficiency






Answer: B

The compressor on the gas turbine

The compressor on the gas turbine

a) can be driven by the load turbine
b) is always of the axial type
c) is always a multi-stage compressor
d) is always independently driven
e) is always a reciprocating type




Answer: A

A gas turbine compressor is usually

A gas turbine compressor is usually

a) centrifugal type
b) downstream of the turbine
c) dynamic axial design
d) downstream of the combustor
e) driven by a motor





Answer: C

A gas turbine must be rotated at _____ of its maximum speed before fuel is turned on.

A gas turbine must be rotated at _____ of its maximum speed before fuel is turned on.

a. 10% to 30%
b. 15% to 30%
c. 20% to 30%
d. 25% to 30%
e. 25% to 50%






Answer: C

A gas turbine:

A gas turbine:

a. Expands hot gases through the compressor
b. Output increases when using air of maximum density
c. Operates the best when the inlet air is hot
d. Output increases at higher altitude
e. Output increases when equipped with an air preheater




Answer: B

A gas turbine performs most effectively if the:

A gas turbine performs most effectively if the:

a. Lubricating oil is of low viscosity
b. Cooling water temperature is kept low
c. Compressor inlet air temperature is high
d. Ambient air temperature is low
e. Load is added immediately after starting






Answer: D

An arrangement of a steam system and a gas turbine is commonly referred to as

An arrangement of a steam system and a gas turbine is commonly referred to as

a. A complex-cycle system
b. A cogeneration system
c. A once-through system
d. A 2-stage system
e. A high capacity system




Answer: B

Early gas turbines were handicapped by:

Early gas turbines were handicapped by:

a. Metal not being able to withstand high-speed centrifugal forces
b. The inability to get enough air into the combustion chamber
c. Metals not standing the high temperatures involved
d. Their high operating speeds
e. Their inadequate power capability





Answer: C

The low installation cost of a gas turbine is:

The low installation cost of a gas turbine is:

a. Due to cheap materials in the blades
b. Due to short fuel lines
c. Because no fuel pump is required
d. Because no electrical wiring is required
e. Because less auxiliary equipment is needed





Answer: E

Clean air flows into a gas turbine regenerator from:

Clean air flows into a gas turbine regenerator from:

a. Before the compressor
b. After the combustion chamber
c. Between the turbine and combustion chamber
d. Between the turbine and atmosphere
e. Downstream of the compressor





Answer: E

Some of the characteristics that make the gas turbine a better choice over other prime movers are:

Some of the characteristics that make the gas turbine a better choice over other prime movers are:

a. Low power-to-weight ratio
b. High thermal efficiency
c. Rapid startup and loading
d. Low fuel consumption
e. Low NOx emissions




Answer: C

The purpose of a regenerator is to:

The purpose of a regenerator is to:

a. Re-circulate the exhaust gases back through the compressor
b. Improve the efficiency of the turbine
c. Increase the temperature in the combustion chamber
d. Decrease the temperature in the combustion chamber
e. Remove the exhaust gas impurities




Answer: B

Gas turbines are ideal where:

Gas turbines are ideal where:

a. Noise is undesirable
b. Water is scarce
c. Industrial sites are small and in populated areas
d. Thermal pollution is of major concern
e. There is an abundance of qualified Power Engineers to operate them.




Answer: B

A simple gas turbine is one without reheaters or:

A simple gas turbine is one without reheaters or:

a. Starting motors
b. Shafts
c. Compressors
d. Combustors
e. Regenerators




Answer: E