4B POWER ENGINEERING FULL
QUESTIONS AND CORRECT ANSWERS
FINAL PAPER
●● Why are large power production plants usually of the thermal type?
Answer: They can burn solid fuels, which are the most plentiful and
cheapest.
●● What is the best way to check running bearings?
Answer: Get accustomed to normal running temperature and vibration
by feel.
●● What is one of the first ways to detect a fault in a reciprocating
engine?
Answer: By sound.
●● Why can a steam turbine's exhaust often supply a process with
steam?
Answer: It is free of oil.
●● What holds turbine segmental carbon ring sealing glands in place?
Answer: Garter springs.
,●● At what percentage over normal operating speed should a turbine
trip?
Answer: 10 to 15%.
●● What type of turbine will have a vacuum in the last row of rotating
blades?
Answer: Condensing turbines.
●● What is the purpose of shrouding on steam turbine blading?
Answer: To confine the steam to the blades.
●● What are the functions of a turbine overspeed trip?
Answer: Prevents exceeding maximum rated speed, closes stop valve,
and must be tested before service.
●● What is a secondary use of turbine lubricating oil besides
lubrication?
Answer: It can be used to operate the turbine governor.
●● What is the purpose of turbine glands?
Answer: To prevent steam escaping from the turbine.
●● What type of shaft sealing is used in high output turbines?
, Answer: Labyrinth seals.
●● What characterizes an impulse turbine stage?
Answer: Steam pressure drop occurs only in the stationary members.
●● What characterizes a reaction turbine stage?
Answer: Steam pressure drops through both moving and stationary
sections.
●● What device is used to fine-tune turbine speed within 10% of rated
speed?
Answer: Hand speed control.
●● What contacts the collar on a turbine shaft to prevent axial
movement?
Answer: Thrust bearings.
●● What is the lubrication characteristic of shaft sealing carbon glands?
Answer: They are self-lubricating.
●● What principle do the great majority of steam turbine governing
systems utilize?
Answer: Mechanical centrifugal principle.
QUESTIONS AND CORRECT ANSWERS
FINAL PAPER
●● Why are large power production plants usually of the thermal type?
Answer: They can burn solid fuels, which are the most plentiful and
cheapest.
●● What is the best way to check running bearings?
Answer: Get accustomed to normal running temperature and vibration
by feel.
●● What is one of the first ways to detect a fault in a reciprocating
engine?
Answer: By sound.
●● Why can a steam turbine's exhaust often supply a process with
steam?
Answer: It is free of oil.
●● What holds turbine segmental carbon ring sealing glands in place?
Answer: Garter springs.
,●● At what percentage over normal operating speed should a turbine
trip?
Answer: 10 to 15%.
●● What type of turbine will have a vacuum in the last row of rotating
blades?
Answer: Condensing turbines.
●● What is the purpose of shrouding on steam turbine blading?
Answer: To confine the steam to the blades.
●● What are the functions of a turbine overspeed trip?
Answer: Prevents exceeding maximum rated speed, closes stop valve,
and must be tested before service.
●● What is a secondary use of turbine lubricating oil besides
lubrication?
Answer: It can be used to operate the turbine governor.
●● What is the purpose of turbine glands?
Answer: To prevent steam escaping from the turbine.
●● What type of shaft sealing is used in high output turbines?
, Answer: Labyrinth seals.
●● What characterizes an impulse turbine stage?
Answer: Steam pressure drop occurs only in the stationary members.
●● What characterizes a reaction turbine stage?
Answer: Steam pressure drops through both moving and stationary
sections.
●● What device is used to fine-tune turbine speed within 10% of rated
speed?
Answer: Hand speed control.
●● What contacts the collar on a turbine shaft to prevent axial
movement?
Answer: Thrust bearings.
●● What is the lubrication characteristic of shaft sealing carbon glands?
Answer: They are self-lubricating.
●● What principle do the great majority of steam turbine governing
systems utilize?
Answer: Mechanical centrifugal principle.
