3B2 - 2 - Steam Turbine Auxiliaries and Operation
questions with verified answers
A mechanical overspeed trip system has a BLANK linkage to the
BLANK valve Ans✓✓✓ - mechanical
- steam inlet trip valve
a small slip stream from the oil tank goes through BLANK or BLANK is
used to remove dirt or water Ans✓✓✓ purifier filter or centrifuge
(throws water out of oil)
ADvantage of the In a mechanical-hydraulic governor? Ans✓✓✓
mechanical losses greatly reduced
After oil leaves the bearings in a large turbine how and where does it
go? Ans✓✓✓ drain by gravity into return header into oil tank
Before a cold turbine startup, it should be on the barring gear for how
long? How long when the turbine is shutdown? Ans✓✓✓ - 3 hours
- 24 hours
Disadvantage of a simple mechanical governor is? Ans✓✓✓ high speed
droop (10%),
Electro -hydraulic governor systems use a BLANK fluid power unit to
provide BLANK to operate the servo-rams rather than using part of the
lube oil system Ans✓✓✓ - seperate
, - high pressure hydraulic oil
Electronic Overspeed trip systems contain BLANK gear. BLANK are
mounted to the turbine casing; as the gear pass the sensors, magnetic
induction generates a BLANK voltage. Ans✓✓✓ - notch
- magnetic speed sensors
- AC voltage
governors with BLANK droop are BLANK sensitive to load changes
and generally have more accurate control than governors with high
droop Ans✓✓✓ - low droop
- more
If the load on the turbine increases. the speed will decrease. What does
the result in? (Extraction governing) Ans✓✓✓ - extra steam goes
through extraction valve to low pressure stages = increases load w/ no
change in extraction flow or pressure
If the speed increases in a throttle governing system BLANK force
pushes the BLANK out further which move the governor rod and
through the linkage system adjusts the position of the throttle valve
Ans✓✓✓ - centrifugal
- flyweights
questions with verified answers
A mechanical overspeed trip system has a BLANK linkage to the
BLANK valve Ans✓✓✓ - mechanical
- steam inlet trip valve
a small slip stream from the oil tank goes through BLANK or BLANK is
used to remove dirt or water Ans✓✓✓ purifier filter or centrifuge
(throws water out of oil)
ADvantage of the In a mechanical-hydraulic governor? Ans✓✓✓
mechanical losses greatly reduced
After oil leaves the bearings in a large turbine how and where does it
go? Ans✓✓✓ drain by gravity into return header into oil tank
Before a cold turbine startup, it should be on the barring gear for how
long? How long when the turbine is shutdown? Ans✓✓✓ - 3 hours
- 24 hours
Disadvantage of a simple mechanical governor is? Ans✓✓✓ high speed
droop (10%),
Electro -hydraulic governor systems use a BLANK fluid power unit to
provide BLANK to operate the servo-rams rather than using part of the
lube oil system Ans✓✓✓ - seperate
, - high pressure hydraulic oil
Electronic Overspeed trip systems contain BLANK gear. BLANK are
mounted to the turbine casing; as the gear pass the sensors, magnetic
induction generates a BLANK voltage. Ans✓✓✓ - notch
- magnetic speed sensors
- AC voltage
governors with BLANK droop are BLANK sensitive to load changes
and generally have more accurate control than governors with high
droop Ans✓✓✓ - low droop
- more
If the load on the turbine increases. the speed will decrease. What does
the result in? (Extraction governing) Ans✓✓✓ - extra steam goes
through extraction valve to low pressure stages = increases load w/ no
change in extraction flow or pressure
If the speed increases in a throttle governing system BLANK force
pushes the BLANK out further which move the governor rod and
through the linkage system adjusts the position of the throttle valve
Ans✓✓✓ - centrifugal
- flyweights
