POWER ENGINEERING 4B KEY EXAM
QUESTIONS And CORRECT Answers
The steam engine will have the steam supply to the cylinder shut off once the piston has
travelled: - CORRECT ANSWERS 25 to 35% of its stroke.
A prime mover is: - CORRECT ANSWERS Steam turbine.
A single device which converts enough will source of energy into mechanical motion is a/an: -
CORRECT ANSWERS A prime mover.
Advantages of a steam engine include: - CORRECT ANSWERS It is possible to change the
direction of rotation without the use of gearing.
They are simple and rugged.
They have a slow rotational speed without the need for reduction gearing.
A routine daily maintenance operating steam engine should cover first and foremost. - CORRECT
ANSWERS The lubricators.
One of the first ways to detect the fault in a reciprocating engine is: - CORRECT
ANSWERS By sound.
Thinking of the steam engine and it's construction, what does eccentric mean? - CORRECT
ANSWERS Out of center.
,A steam engine piston: - CORRECT ANSWERS Has greater driving force on it at the
beginning of it stroke.
Large power production plants tend to be of the thermal type because they can burn solid fuel
and: - CORRECT ANSWERS The heat cycle they use is the most efficient.
On a steam engine, what is the purpose of a flywheel? - CORRECT ANSWERS It dampens
speed fluctuations.
It carries the engine over dead center.
What is the main advantage of using the expensive properties of steam? - CORRECT
ANSWERS Economy.
A gasoline engine is a heat engine. What is its working fluid? - CORRECT
ANSWERS Combustion gases and air mixture.
What is the purpose of a turbine thrust bearing? - CORRECT ANSWERS To transfer turbine
thrust to the load.
Shaft sealing carbon glands are: - CORRECT ANSWERS Self lubricating
In a turbine with a pressure lubrication system, The high-pressure oil generally goes to the
governor system. Where is the low-pressure oil led? - CORRECT ANSWERS To the
bearings.
What holds a turbines carbon packing rings axially? - CORRECT ANSWERS Spring pressure.
,Steam pressure.
For what purpose is lubricating oil required on a turbine, beside lubrication? - CORRECT
ANSWERS To carry heat away from the bearings.
In an impulse turbine: - CORRECT ANSWERS The steam pressure is reduced in the nozzles.
Reaction turbines: - CORRECT ANSWERS Have a pressure dropped through the moving
and stationary blades.
Blades or - CORRECT ANSWERS Buckets form the rotor flow passages in the impulse
turbines.
A steam turbine should trip or shut down when normal operating speed is exceeded by: -
CORRECT ANSWERS 10 to 15%.
The handwheel used to adjust the turbine speed on the governor is known as the. - CORRECT
ANSWERS Speeder.
How many basic types of turbines are there? - CORRECT ANSWERS Two.
A large reaction turbine will have: - CORRECT ANSWERS Steam pressure dropping through
moving and stationary sections
Impulse turbines: - CORRECT ANSWERS Have no pressure drop through the moving
blades.
, What do the stationary nozzles of an impulse turbine convert the thermal energy of the steam
into? - CORRECT ANSWERS Kinetic energy.
The steam turbines exhaust can often supply the process with steam because: - CORRECT
ANSWERS It is free of oil.
When the steam pressure drop occurs in only the stationary members or components of a
turbine, the turbine is known as: - CORRECT ANSWERS An impulse unit.
Most turbine overspeed trips operate by: - CORRECT ANSWERS Centrifugal force.
A large reaction turbine will have: - CORRECT ANSWERS Steam pressure dropping through
moving and stationary section
Starting from the boiler and simple power generation cycle, numbering the following
components in the order in which the steam/water flows through the cycle. - CORRECT
ANSWERS One - boiler feed pump
Two - condenser
Three- turbine
Four - condensate pump
Five- feed water heater
The great majority of turbine governors are of the - CORRECT ANSWERS Mechanical
centrifugal type
QUESTIONS And CORRECT Answers
The steam engine will have the steam supply to the cylinder shut off once the piston has
travelled: - CORRECT ANSWERS 25 to 35% of its stroke.
A prime mover is: - CORRECT ANSWERS Steam turbine.
A single device which converts enough will source of energy into mechanical motion is a/an: -
CORRECT ANSWERS A prime mover.
Advantages of a steam engine include: - CORRECT ANSWERS It is possible to change the
direction of rotation without the use of gearing.
They are simple and rugged.
They have a slow rotational speed without the need for reduction gearing.
A routine daily maintenance operating steam engine should cover first and foremost. - CORRECT
ANSWERS The lubricators.
One of the first ways to detect the fault in a reciprocating engine is: - CORRECT
ANSWERS By sound.
Thinking of the steam engine and it's construction, what does eccentric mean? - CORRECT
ANSWERS Out of center.
,A steam engine piston: - CORRECT ANSWERS Has greater driving force on it at the
beginning of it stroke.
Large power production plants tend to be of the thermal type because they can burn solid fuel
and: - CORRECT ANSWERS The heat cycle they use is the most efficient.
On a steam engine, what is the purpose of a flywheel? - CORRECT ANSWERS It dampens
speed fluctuations.
It carries the engine over dead center.
What is the main advantage of using the expensive properties of steam? - CORRECT
ANSWERS Economy.
A gasoline engine is a heat engine. What is its working fluid? - CORRECT
ANSWERS Combustion gases and air mixture.
What is the purpose of a turbine thrust bearing? - CORRECT ANSWERS To transfer turbine
thrust to the load.
Shaft sealing carbon glands are: - CORRECT ANSWERS Self lubricating
In a turbine with a pressure lubrication system, The high-pressure oil generally goes to the
governor system. Where is the low-pressure oil led? - CORRECT ANSWERS To the
bearings.
What holds a turbines carbon packing rings axially? - CORRECT ANSWERS Spring pressure.
,Steam pressure.
For what purpose is lubricating oil required on a turbine, beside lubrication? - CORRECT
ANSWERS To carry heat away from the bearings.
In an impulse turbine: - CORRECT ANSWERS The steam pressure is reduced in the nozzles.
Reaction turbines: - CORRECT ANSWERS Have a pressure dropped through the moving
and stationary blades.
Blades or - CORRECT ANSWERS Buckets form the rotor flow passages in the impulse
turbines.
A steam turbine should trip or shut down when normal operating speed is exceeded by: -
CORRECT ANSWERS 10 to 15%.
The handwheel used to adjust the turbine speed on the governor is known as the. - CORRECT
ANSWERS Speeder.
How many basic types of turbines are there? - CORRECT ANSWERS Two.
A large reaction turbine will have: - CORRECT ANSWERS Steam pressure dropping through
moving and stationary sections
Impulse turbines: - CORRECT ANSWERS Have no pressure drop through the moving
blades.
, What do the stationary nozzles of an impulse turbine convert the thermal energy of the steam
into? - CORRECT ANSWERS Kinetic energy.
The steam turbines exhaust can often supply the process with steam because: - CORRECT
ANSWERS It is free of oil.
When the steam pressure drop occurs in only the stationary members or components of a
turbine, the turbine is known as: - CORRECT ANSWERS An impulse unit.
Most turbine overspeed trips operate by: - CORRECT ANSWERS Centrifugal force.
A large reaction turbine will have: - CORRECT ANSWERS Steam pressure dropping through
moving and stationary section
Starting from the boiler and simple power generation cycle, numbering the following
components in the order in which the steam/water flows through the cycle. - CORRECT
ANSWERS One - boiler feed pump
Two - condenser
Three- turbine
Four - condensate pump
Five- feed water heater
The great majority of turbine governors are of the - CORRECT ANSWERS Mechanical
centrifugal type
