3B2 ABSA already passed
A dummy piston is used on a steam turbine to: - =Counter end thrust
The entrance angle of a reaction blade is: - =Almost 90 degrees
To ensure a tight seal, a steam turbine balance piston is fitted with _____. - =Labyrinth seals
Extraction turbines are turbines where steam is extracted at one or more points at constant: -
=Pressure
In a steam turbine having pressure drop across the moving blades, an unbalanced _____ thrust
will be developed upon the rotor. - =Axial
All large disc rotors are machined from __________ steel: - =A solid forging of nickel steel.
Convergent-divergent nozzles are used when: - =High pressure drops are required
During start up of a steam turbine the thrust block is pushed against a stop in the direction of the
exhaust for: - =Maximum blade clearance
In a steam turbine using velocity compounding _____ expand(s) the steam from initial to exhaust
pressure. - =One set of nozzles
A thrust adjusting gear: - =Positions the turbine rotor axially
A hollow drum rotor of a steam turbine is machined both outside and inside. How is the drum
end cover with shaft installed in the rotor? - =Shrink fitted and welded
Steam turbine casing joints are made steam tight by matching _____ exactly. - =Flange faces
,A back-pressure turbine with exhaust steam going to an old boiler header that is supplying steam
to an old lower pressure turbine is called a: - =Topping turbine
A reaction turbine has: - =Rows of stationary blades alternating with rows of moving blades
When disc rotors are assembled, the discs are heated until they are easily slid along the shaft and
then located in the correct position on the shaft and shaft key. A small clearance between the
discs prevents: - =Thermal stress in the shaft
The purpose of compounding in a steam turbine is to: - =Reduce steam and blade velocity
On larger turbines the _____ is split in a horizontal direction. - =Cylinder
The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the
moving blades in a/an __________ turbine. - =Impulse
In a condensing-bleeder turbine up to 2% of the total steam flow may be bled off. What is the
bleed-steam used for? - =Feed-water heating
It is general practice to let the thickness of the walls and flanges _____ from inlet to exhaust end
of a steam turbine casing: - =Decrease
A water seal is used on some steam turbines ________ to insure that no air leaks in along the
shaft: - =At speeds above 2000 rev/mm
If a turbine is shut down and left at a standstill while still hot, the lower half of the rotor will cool
faster than the upper half. The rotor will "hog", which means it will ___________. - =Bend
upwards
The warm-up time required of a turbine is dependant on: - =The size of the turbine
, The advantage of mechanical-hydraulic governors is: - =Mechanical losses are greatly reduced
In order to supply oil at two different pressures, a typical turbine lube oil system has: - =A
pressure reducing valve
Overspeed trips: - =Are independent of the governing system
In a back-pressure turbine the governor is _____ sensitive. - =Pressure
On startup of a large condensing turbine, the cooling water to the oil cooler is turned on: -
=When the oil reaches normal operating temperatures
In an overspeed trip the spring loaded tripping bolt has a center of gravity: - =Towards the head
end of the bolt
Turbines used to drive auxiliary equipment are usually lubricated by: - =Ring-oiled bearings
A mechanical overspeed trip is designed to _____ in the event of an overspeed condition. - =Shut
off the turbine's steam supply
When starting an extraction turbine, sealing steam to the turbine glands is admitted _____ is put
in operation - =After the extraction pump
The barring gear: - =Should disengage and automatically shut down after steam starts to rotate
the turbine
Sealing steam to the turbine glands is admitted _____ is put in operation - =After the extraction
pump
In a turbine circuit, feed heaters and deaerators serve to: - =Increase efficiency
A dummy piston is used on a steam turbine to: - =Counter end thrust
The entrance angle of a reaction blade is: - =Almost 90 degrees
To ensure a tight seal, a steam turbine balance piston is fitted with _____. - =Labyrinth seals
Extraction turbines are turbines where steam is extracted at one or more points at constant: -
=Pressure
In a steam turbine having pressure drop across the moving blades, an unbalanced _____ thrust
will be developed upon the rotor. - =Axial
All large disc rotors are machined from __________ steel: - =A solid forging of nickel steel.
Convergent-divergent nozzles are used when: - =High pressure drops are required
During start up of a steam turbine the thrust block is pushed against a stop in the direction of the
exhaust for: - =Maximum blade clearance
In a steam turbine using velocity compounding _____ expand(s) the steam from initial to exhaust
pressure. - =One set of nozzles
A thrust adjusting gear: - =Positions the turbine rotor axially
A hollow drum rotor of a steam turbine is machined both outside and inside. How is the drum
end cover with shaft installed in the rotor? - =Shrink fitted and welded
Steam turbine casing joints are made steam tight by matching _____ exactly. - =Flange faces
,A back-pressure turbine with exhaust steam going to an old boiler header that is supplying steam
to an old lower pressure turbine is called a: - =Topping turbine
A reaction turbine has: - =Rows of stationary blades alternating with rows of moving blades
When disc rotors are assembled, the discs are heated until they are easily slid along the shaft and
then located in the correct position on the shaft and shaft key. A small clearance between the
discs prevents: - =Thermal stress in the shaft
The purpose of compounding in a steam turbine is to: - =Reduce steam and blade velocity
On larger turbines the _____ is split in a horizontal direction. - =Cylinder
The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the
moving blades in a/an __________ turbine. - =Impulse
In a condensing-bleeder turbine up to 2% of the total steam flow may be bled off. What is the
bleed-steam used for? - =Feed-water heating
It is general practice to let the thickness of the walls and flanges _____ from inlet to exhaust end
of a steam turbine casing: - =Decrease
A water seal is used on some steam turbines ________ to insure that no air leaks in along the
shaft: - =At speeds above 2000 rev/mm
If a turbine is shut down and left at a standstill while still hot, the lower half of the rotor will cool
faster than the upper half. The rotor will "hog", which means it will ___________. - =Bend
upwards
The warm-up time required of a turbine is dependant on: - =The size of the turbine
, The advantage of mechanical-hydraulic governors is: - =Mechanical losses are greatly reduced
In order to supply oil at two different pressures, a typical turbine lube oil system has: - =A
pressure reducing valve
Overspeed trips: - =Are independent of the governing system
In a back-pressure turbine the governor is _____ sensitive. - =Pressure
On startup of a large condensing turbine, the cooling water to the oil cooler is turned on: -
=When the oil reaches normal operating temperatures
In an overspeed trip the spring loaded tripping bolt has a center of gravity: - =Towards the head
end of the bolt
Turbines used to drive auxiliary equipment are usually lubricated by: - =Ring-oiled bearings
A mechanical overspeed trip is designed to _____ in the event of an overspeed condition. - =Shut
off the turbine's steam supply
When starting an extraction turbine, sealing steam to the turbine glands is admitted _____ is put
in operation - =After the extraction pump
The barring gear: - =Should disengage and automatically shut down after steam starts to rotate
the turbine
Sealing steam to the turbine glands is admitted _____ is put in operation - =After the extraction
pump
In a turbine circuit, feed heaters and deaerators serve to: - =Increase efficiency
