- The gas turbine system is:
a. Ideal for large generator systems
b. Ideal to be used over a steam turbine
c. Ideal to be used for unmanned and remote locations
d. Ideal for all applications of a process plant
e. Ideal for large gas plant
C. Ideal to be used for unmanned and remote locations
- Gas turbines are used in industry as prime movers for:
1) Portable generators 2) Fire pumps 3) Air compressors 4) Emergency equipment
a. 1, 2, 3
b. 1, 2, 4
c. 1, 3, 4
d. 1, 2, 3, 4
e. 2, 3, 4
D. 1, 2, 3, 4
1) Portable generators
2) Fire pumps
3) Air compressors
4) Emergency equipment
- Gas turbine units are used:
1) For electrical generation 2) Where energy is produced for process plants 3) Where waste gases from the process may be used to drive the gas turbine 4) Where high thermal efficiency is required
a. 1, 2, 3
b. 1, 3, 4
c. 2, 3, 4
d. 1, 2, 3, 4
e. 1, 2, 4
A. 1, 2, 3
1) For electrical generation
2) Where energy is produced for process plants
3) Where waste gases from the process may be used to drive the gas turbine
- Gas turbines are used in large power plants to provide almost instant emergency power for:
a. Peak load shaving
b. High heating load
c. Water pumps
d. Exit lighting
e. Essential services
E. Essential services
- Some of the characteristics which make the gas turbine a better choice over other prime movers are:
1) Low maintenance 2) Minimum cooling water required 3) High thermal efficiency 4) Rapid start up and loading
a. 1, 2, 3
b. 1, 2, 4
c. 1, 3, 4
d. 2, 3, 4
e. 1, 2, 3, 4
B. 1, 2, 4
1) Low maintenance
2) Minimum cooling water required
4) Rapid start up and loading
- Gas turbines are far superior to other types of engines in their:
a. Fuel consumption
b. Efficiency
c. Lubricating oil consumption
d. Power per mass ratio
e. Fuel usage
D. Power per mass ratio
- 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
d. Must use a cooler before the regeneration
e. Has a lower initial cost than that of the open cycle gas turbine
C. Will use the same working fluid over again
- The compressor on a 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. Can be of the reciprocating type
e. Is always of the centrifugal type
A. Can be driven by the load turbine
- In a dual shaft gas turbine arrangement:
a. The load turbine is down stream from the compressor turbine
b. The load turbine drives the prop on a turbo prop engine
c. Is always used in an open cycle
d. System flexibility is reduced
e. A larger starting motor is required
A. The load turbine is down stream from the compressor turbine
- The advantages of a dual shaft gas turbine arrangement are:
1) Greater flexibility 2) It is cheaper 3) Smaller starting motor may be used 4) High pressures and temperatures may be obtained
a. 1, 2
b. 1, 3
c. 2, 3
d. 2, 4
e. 1, 4
b. 1, 3
1) Greater flexibility
3) Smaller starting motor may be used
- In a gas turbine cycle using an intercooler the following advantages are obtained:
1) The specific volume of the air is reduced 2) The cooler air recovers more heat from the regenerator 3) The temperature of the second stage compressor will be increased thus increasing thermal efficiency 4) More of the turbine power can be available for the output load
a. 1, 2, 3
b. 1, 2, 4
c. 1, 3, 4
d. 2, 3, 4
e. 1, 2, 3, 4
B. 1, 2, 4
1) The specific volume of the air is reduced
2) The cooler air recovers more heat from the regenerator
4) More of the turbine power can be available for the output load
- The advantages of using a reheater in a gas turbine cycle are:
1) More air can be compressed 2) A small combustor may be used 3) Less air will have to be compressed in order to do the same amount of work 4) The thermal efficiency of the cycle will be improved
a. 1, 3
b. 1, 4
c. 2, 3
d. 2, 3
e. 3, 4
E. 3, 4
3) Less air will have to be compressed in order to do the same amount of work
4) The thermal efficiency of the cycle will be improved
- The purpose of a regenerator in a gas turbine is:
a. To clean the exhaust gases
b. To improve the efficiency of the turbine
c. To decrease the temperature in the combustion chamber
d. To raise the air temperature before compression
e. To decrease the air temperature after compression
B. To improve the efficiency of the turbine
- The regenerator in a gas turbine cycle is located:
a. Between the power and load turbine
b. Between the turbine outlet and compressor inlet
c. Between the compressor and combustor
d. Between the combustor and turbine
e. Between the power turbine and generator
C. Between the compressor and combustor
- The regenerator of a gas turbine cycle is a:
a. Second combustor
b. Heat exchanger
c. Vessel used to transfer heat from the exhaust gas to the working fluid before compression occurs
d. Increase the pressure of the working fluid in the system
e. Increase the temperature of the combustor’s outlet
B. Heat exchanger
- A gas turbine air compressor with an intercooler:
a. Has the intercooler located after the compressor
b. Increases the volume of air being supplied
c. Allows more output at the turbine
d. Used only with axial type compressors
e. Are not as efficient
C. Allows more output at the turbine
- The combustion chamber of a gas turbine:
a. Increases the pressure of the compressed air
b. Burns fuel with excess air
c. Is located between the load turbine and the compressor turbine
d. Is always of the multiple burner type
e. Utilizes 70 % of the air supplied by the compressor for actual combustion process
B. Burns fuel with excess air
- A gas turbine combustion chamber requires:
a. A cooling water jacket on the inner canister
b. A vacuum breaker
c. A safety pressure relief device
d. A high voltage ignition plug for initial ignition
e. An annual hydrostatic test
D. A high voltage ignition plug for initial ignition
- The capacity of a gas turbine will increase in cold weather because:
a. High grades of fuel oil burn better at cooler temperatures
b. The density of the air is increased
c. The volume if the air will increase
d. The temperature drop throughout the cycle will be less
e. The atmospheric pressure will increase
B. The density of the air is increased
- Which of the following are advantages of a gas turbine:
1) Simple design 2) Low cost 3) Minimal manpower 4) Maximum outage time 5) Rapid starting
a. 1, 2, 3, 4
b. 2, 3, 4, 5
c. 1, 3, 4, 5
d. 1, 2, 3, 5
e. 1, 2, 4, 5
D. 1, 2, 3, 5
1) Simple design
2) Low cost
3) Minimal manpower
5) Rapid starting
- Which of the following are disadvantages of a gas turbine?
1) Complicated design 2) High manufacturing costs 3) Slow response to load change 4) Low efficiency 5) Suitable for low power applications
a. 1, 3, 5
b. 2, 3, 4
c. 3, 4, 5
d. 1, 4, 5
e. 1, 2, 3
E. 1, 2, 3
1) Complicated design
2) High manufacturing costs
3) Slow response to load change
- The term peaking gas turbine refers to:
a. Gas turbines that produce max power
b. Gas turbines used with peak horsepower
c. Gas turbines used during major outages
d. Gas turbines used every day
e. Gas turbines used in heavy load situations
E. Gas turbines used in heavy load situations
- Industrial gas turbines compared to aero-derivative turbines are:
a. Light weight
b. Rapid load changers
c. Less efficient
d. Use all different fuels
e. Fast starting
C. Less efficient
- In simple gas turbines the air is compressed to the following maximum pressures:
a. 2000 kPa
b. 2500 kPa
c. 3000 kPa
d. 3500 kPa
e. 4000 kPa
C. 3000 kPa
