3rd B2 Practice Exam Questions With Complete Solutions
_________________ is the percent change in speed required for
load change equal to the rated. Correct Answers Governor
speed drop
244. In a nuclear power plant circulating coolant picks up heat in
the reactor and rejects it to the _______________ in the steam
cycle by means of a heat exchanger. Correct Answers working
fluid
A _______________ also acts as a deaerator even with the
turbine at full load and the condenser operating at a reduced
vacuum. Correct Answers surface condenser
A balance piston on a steam turbine is used to Correct Answers
counteract end thrust
A barring gear consists of an electric motor and several sets of
reducing gears to turn the turbine shaft at a low speed. It is used
Correct Answers 1) After stopping a hot turbine to prevent
"hogging"
4) Prior to start-up for approximately 3 hours
A closed cycle gas turbine system: Correct Answers Will use
the same working fluid over again
A condensing-bleeder turbine can bleed up to ______ of the
total steam flow. Correct Answers 0.2
,A fuel gas compressor must be used on gas turbines if? Correct
Answers The gas supply pressure is less than the last stage
pressure
A gas turbine air compressor with an intercooler: Correct
Answers Allows more output at the turbine
A gas turbine combustion chamber requires Correct Answers A
high voltage ignition plug for initial ignition
A Hollow Drum Rotor, for good balance, is machined both
outside and inside thus the drum must be open at one end. How
is the drum end cover with shaft installed in the rotor? Correct
Answers Shrink fit and welded
A reaction turbine results in a long machine due to a large
number of alternate rows of Correct Answers fixed and moving
blades
A steam turbine assembled casing is machined off inside in a
boring mill to: Correct Answers 1) Make grooves for shaft seals
2) Make grooves for diaphragms
3) Machine surfaces for bearings
A steam turbine balance piston is fitted with ______ to ensure a
tight seal. Correct Answers labyrinth seal
A steam turbine balance piston is fitted with rings to ensure a
tight seal. Correct Answers false
, A steam turbine water seal is used ________ to insure that no air
leaks in along the shaft. Correct Answers at speed above 2000
rev/min
A surface condenser may be ________________ . Correct
Answers 1) oval
3) cylindrical
4) rectangular
A topping turbine is an application of Correct Answers A back
pressure turbine
Advantages of gas turbines intakes are: Correct Answers 1)
Remove contaminants
2) Prevent damage from foreign objects
3) Allow addition of special cooling systems
4) Smooth air flow into the compressor
Aero-derivative engines are aircraft jet engines that Correct
Answers converted from a turbo prop engine
Aero-derivative lube oil systems use a scavenge pump to
Correct Answers return oil from the bearings to the supply
Air in a surface condenser: Correct Answers 1) Increases the
pressure
2) Retards heat transfer
4) Is cooled before being removed
All major oil systems consist of what basic components? Correct
Answers 1) An oil reservoir to ensure an adequate supply of oil
_________________ is the percent change in speed required for
load change equal to the rated. Correct Answers Governor
speed drop
244. In a nuclear power plant circulating coolant picks up heat in
the reactor and rejects it to the _______________ in the steam
cycle by means of a heat exchanger. Correct Answers working
fluid
A _______________ also acts as a deaerator even with the
turbine at full load and the condenser operating at a reduced
vacuum. Correct Answers surface condenser
A balance piston on a steam turbine is used to Correct Answers
counteract end thrust
A barring gear consists of an electric motor and several sets of
reducing gears to turn the turbine shaft at a low speed. It is used
Correct Answers 1) After stopping a hot turbine to prevent
"hogging"
4) Prior to start-up for approximately 3 hours
A closed cycle gas turbine system: Correct Answers Will use
the same working fluid over again
A condensing-bleeder turbine can bleed up to ______ of the
total steam flow. Correct Answers 0.2
,A fuel gas compressor must be used on gas turbines if? Correct
Answers The gas supply pressure is less than the last stage
pressure
A gas turbine air compressor with an intercooler: Correct
Answers Allows more output at the turbine
A gas turbine combustion chamber requires Correct Answers A
high voltage ignition plug for initial ignition
A Hollow Drum Rotor, for good balance, is machined both
outside and inside thus the drum must be open at one end. How
is the drum end cover with shaft installed in the rotor? Correct
Answers Shrink fit and welded
A reaction turbine results in a long machine due to a large
number of alternate rows of Correct Answers fixed and moving
blades
A steam turbine assembled casing is machined off inside in a
boring mill to: Correct Answers 1) Make grooves for shaft seals
2) Make grooves for diaphragms
3) Machine surfaces for bearings
A steam turbine balance piston is fitted with ______ to ensure a
tight seal. Correct Answers labyrinth seal
A steam turbine balance piston is fitted with rings to ensure a
tight seal. Correct Answers false
, A steam turbine water seal is used ________ to insure that no air
leaks in along the shaft. Correct Answers at speed above 2000
rev/min
A surface condenser may be ________________ . Correct
Answers 1) oval
3) cylindrical
4) rectangular
A topping turbine is an application of Correct Answers A back
pressure turbine
Advantages of gas turbines intakes are: Correct Answers 1)
Remove contaminants
2) Prevent damage from foreign objects
3) Allow addition of special cooling systems
4) Smooth air flow into the compressor
Aero-derivative engines are aircraft jet engines that Correct
Answers converted from a turbo prop engine
Aero-derivative lube oil systems use a scavenge pump to
Correct Answers return oil from the bearings to the supply
Air in a surface condenser: Correct Answers 1) Increases the
pressure
2) Retards heat transfer
4) Is cooled before being removed
All major oil systems consist of what basic components? Correct
Answers 1) An oil reservoir to ensure an adequate supply of oil
