Power Engineering - 4B7 Practice Questions With Complete
Solutions
_______________ causes the fuel to ignite in a diesel engine.
a. A precisely timed glow plug.
b. The pressure of the injected fuel.
c. The high temperature compressed air in the engine cylinder.
d. The fuel injector nozzle. Correct Answers c. The high
temperature compressed air in the engine cylinder.
A _________ is a machinery component used to seal a rotating
or reciprocating shaft against fluid leakage:
a. gland
b. packing ring
c. packing nut
d. bearing Correct Answers a. gland
A "prime mover" is:
a. an electric motor
b. a steam turbine
c. a centrifugal pump
d. an air compressor
e. a boiler Correct Answers b. a steam turbine
A boiler that generates steam from heat produced by a chemical
process, a thermal process, or a prime mover is known as a:
a. once through steam generator
,b. heat recovery steam generator
c. gas turbine steam generator
d. combined cycle steam generator Correct Answers b. heat
recovery steam generator
A closed cycle gas turbine:
a. Burns fuel with spent exhaust gas.
b. Recycles the same working fluid
c. Is the most common type of gas turbine
d. Does not need a combustion chamber Correct Answers b.
Recycles the same working fluid
A cold weather cooling tower bypass valve should not be fully
closed until the temperature reaches:
a. about 27°C
b. +5°C
c. the point at which drift stops
d. the compressor setpoint Correct Answers a. about 27°C
A cold weather cooling tower bypass valve should not be fully
closed until the temperature reaches:
a. the compressor setpoint
b. the point at which drift stops
c. +5C
d. about 27C Correct Answers d. about 27C
A counter-flow cooling tower _____________ than a crossflow
cooling tower.
,a. is shorter
b. requires less floor space
c. requires less fan power
d. has a lower pressure drop Correct Answers b. requires less
floor space
A disadvantage of the gas turbine is?
a. High cost
b. High maintenance
c. Requires a lot of cooling water
d. Low thermal Efficiency Correct Answers d. Low thermal
Efficiency
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 Correct Answers c. dynamic axial design
A gas turbine compressor:
a. is always an axial compressor
b. can be driven by the load turbine
c. must be intercooled
d. must be a multi-stage compressor Correct Answers b. can be
driven by the load turbine
, A gas turbine is most efficient when:
a. operated at the highest combustion temperature that the
construction materials permit.
b. the ambient air temperature is low
c. the combustion chamber is kept cool
d. both turbine shafts run at the same speed Correct Answers a.
operated at the highest combustion temperature that the
construction materials permit.
A gas turbine must be rotated at _______ speed before ignition
begins.
a. 10% of its maximum
b. 120% of its maximum
c. 20% to 30% of its maximum
d. full Correct Answers c. 20% to 30% of its maximum
A gas turbine:
a. Output increases when equipped with an air preheater
b. Operates the best when the inlet air is hot
c. Output increases when using air of maximum density
d. Expands hot gases through the compressor Correct Answers
c. Output increases when using air of maximum density
A gasoline engine is a "heat engine". What is its working fluid?
a. glycol
b. gasoline
c. air
Solutions
_______________ causes the fuel to ignite in a diesel engine.
a. A precisely timed glow plug.
b. The pressure of the injected fuel.
c. The high temperature compressed air in the engine cylinder.
d. The fuel injector nozzle. Correct Answers c. The high
temperature compressed air in the engine cylinder.
A _________ is a machinery component used to seal a rotating
or reciprocating shaft against fluid leakage:
a. gland
b. packing ring
c. packing nut
d. bearing Correct Answers a. gland
A "prime mover" is:
a. an electric motor
b. a steam turbine
c. a centrifugal pump
d. an air compressor
e. a boiler Correct Answers b. a steam turbine
A boiler that generates steam from heat produced by a chemical
process, a thermal process, or a prime mover is known as a:
a. once through steam generator
,b. heat recovery steam generator
c. gas turbine steam generator
d. combined cycle steam generator Correct Answers b. heat
recovery steam generator
A closed cycle gas turbine:
a. Burns fuel with spent exhaust gas.
b. Recycles the same working fluid
c. Is the most common type of gas turbine
d. Does not need a combustion chamber Correct Answers b.
Recycles the same working fluid
A cold weather cooling tower bypass valve should not be fully
closed until the temperature reaches:
a. about 27°C
b. +5°C
c. the point at which drift stops
d. the compressor setpoint Correct Answers a. about 27°C
A cold weather cooling tower bypass valve should not be fully
closed until the temperature reaches:
a. the compressor setpoint
b. the point at which drift stops
c. +5C
d. about 27C Correct Answers d. about 27C
A counter-flow cooling tower _____________ than a crossflow
cooling tower.
,a. is shorter
b. requires less floor space
c. requires less fan power
d. has a lower pressure drop Correct Answers b. requires less
floor space
A disadvantage of the gas turbine is?
a. High cost
b. High maintenance
c. Requires a lot of cooling water
d. Low thermal Efficiency Correct Answers d. Low thermal
Efficiency
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 Correct Answers c. dynamic axial design
A gas turbine compressor:
a. is always an axial compressor
b. can be driven by the load turbine
c. must be intercooled
d. must be a multi-stage compressor Correct Answers b. can be
driven by the load turbine
, A gas turbine is most efficient when:
a. operated at the highest combustion temperature that the
construction materials permit.
b. the ambient air temperature is low
c. the combustion chamber is kept cool
d. both turbine shafts run at the same speed Correct Answers a.
operated at the highest combustion temperature that the
construction materials permit.
A gas turbine must be rotated at _______ speed before ignition
begins.
a. 10% of its maximum
b. 120% of its maximum
c. 20% to 30% of its maximum
d. full Correct Answers c. 20% to 30% of its maximum
A gas turbine:
a. Output increases when equipped with an air preheater
b. Operates the best when the inlet air is hot
c. Output increases when using air of maximum density
d. Expands hot gases through the compressor Correct Answers
c. Output increases when using air of maximum density
A gasoline engine is a "heat engine". What is its working fluid?
a. glycol
b. gasoline
c. air
