Power Engineering 3B2 ch5 (Gas Turbine Auxiliaries &
Operation) Questions With Complete Solutions
In order to keep the gas pass of a gas turbine clean the following
must be done:
1) Inspect and clean air intake filters
2) Water washing of compressor blades
3) Inspect and clean air intake ducts
4) Good quality fuel must be used
a. 1, 2
b. 1, 3
c. 1, 2, 3
d. 1, 2, 3, 4
e. 1, 3, 4
D
Why do microturbines require only air bearings:
1) No governing oil system
2) Small overall size
3) Simplicity of components
4) Everything on one shaft
5) No oil systems
a. 1, 2
b. 2, 3
c. 2, 5
,d. 3, 4
e. 4, 5
C
Most aero derivative turbines lube oil systems require?
a. Two back lube oil pumps
b. Separate inlet and outlet filter systems
c. Separate lube oil tanks and coolers
d. Separate lube oil systems
e. Separate back up pumps
D
Thrust bearings on dual shaft gas turbines are positioned:
a. At the front of the compressor and next to the turbine bearing.
b. At the front of both the compressor and the turbine section.
c. At the back of both the compressor section and the turbine
section.
d. At the back of the compressor and next to the turbine bearing.
e. At the front and back of the turbine section.
A
Tilt pad bearings are used:
1) In aero-derivative gas turbines
2) According to the manufacturers specifications
3) On duel shaft industrial gas turbines
4) In large industrial gas turbines
5) With pivot pins
,a. 1, 2
b. 2, 3
c. 3, 4
d. 4, 5
e. 5, 1
D
Aero-derivative lube oil systems use a scavenge pump to:
a. Recycle oil form the cleaning system
b. Collects oil from all users for recycling
c. Siphons off small amounts of oil for cleaning
d. Collects oil from the supply and return filters for cleaning
e. Returns the oil from the bearings to the supply
E
Natural gas is the best fuel for gas turbines because:
1) No onsite storage
2) Most efficient combustion
3) Simplest control system
4) Highest heat value
5) Cleanest burning
a. 1, 3
b. 2, 4
c. 3, 5
d. 2, 5
e. 2, 3
, D
A fuel gas compressor must be used on gas turbines if?
a. The complexity of the gas system reduces the gas pressure to
low
b. The gas supply pressure is less than the compressor last stage
pressure
c. The total pressure drop across the combustors is too great
d. Multiple gas nozzles drops the burner gas pressure too low
e. The combustor outlet pressure is greater the compressor outlet
pressure
B
The most important component of a fuel metering system is?
a. Fuel gas Hi/Lo pressure switches
b. Duplex filters/separators
c. Fuel metering valve
d. Primary and secondary shut off valves
e. Fuel gas scrubber
C
The use of a low heating value (LHV) fuel requires:
a. Special nozzles and combustors
b. Higher pressure gas supply
c. Higher pressure gas compressors
d. Higher pressures from the compressor
e. Larger bore piping for high flow rates
Operation) Questions With Complete Solutions
In order to keep the gas pass of a gas turbine clean the following
must be done:
1) Inspect and clean air intake filters
2) Water washing of compressor blades
3) Inspect and clean air intake ducts
4) Good quality fuel must be used
a. 1, 2
b. 1, 3
c. 1, 2, 3
d. 1, 2, 3, 4
e. 1, 3, 4
D
Why do microturbines require only air bearings:
1) No governing oil system
2) Small overall size
3) Simplicity of components
4) Everything on one shaft
5) No oil systems
a. 1, 2
b. 2, 3
c. 2, 5
,d. 3, 4
e. 4, 5
C
Most aero derivative turbines lube oil systems require?
a. Two back lube oil pumps
b. Separate inlet and outlet filter systems
c. Separate lube oil tanks and coolers
d. Separate lube oil systems
e. Separate back up pumps
D
Thrust bearings on dual shaft gas turbines are positioned:
a. At the front of the compressor and next to the turbine bearing.
b. At the front of both the compressor and the turbine section.
c. At the back of both the compressor section and the turbine
section.
d. At the back of the compressor and next to the turbine bearing.
e. At the front and back of the turbine section.
A
Tilt pad bearings are used:
1) In aero-derivative gas turbines
2) According to the manufacturers specifications
3) On duel shaft industrial gas turbines
4) In large industrial gas turbines
5) With pivot pins
,a. 1, 2
b. 2, 3
c. 3, 4
d. 4, 5
e. 5, 1
D
Aero-derivative lube oil systems use a scavenge pump to:
a. Recycle oil form the cleaning system
b. Collects oil from all users for recycling
c. Siphons off small amounts of oil for cleaning
d. Collects oil from the supply and return filters for cleaning
e. Returns the oil from the bearings to the supply
E
Natural gas is the best fuel for gas turbines because:
1) No onsite storage
2) Most efficient combustion
3) Simplest control system
4) Highest heat value
5) Cleanest burning
a. 1, 3
b. 2, 4
c. 3, 5
d. 2, 5
e. 2, 3
, D
A fuel gas compressor must be used on gas turbines if?
a. The complexity of the gas system reduces the gas pressure to
low
b. The gas supply pressure is less than the compressor last stage
pressure
c. The total pressure drop across the combustors is too great
d. Multiple gas nozzles drops the burner gas pressure too low
e. The combustor outlet pressure is greater the compressor outlet
pressure
B
The most important component of a fuel metering system is?
a. Fuel gas Hi/Lo pressure switches
b. Duplex filters/separators
c. Fuel metering valve
d. Primary and secondary shut off valves
e. Fuel gas scrubber
C
The use of a low heating value (LHV) fuel requires:
a. Special nozzles and combustors
b. Higher pressure gas supply
c. Higher pressure gas compressors
d. Higher pressures from the compressor
e. Larger bore piping for high flow rates
