Power Engineering 3B2 - Chapter 2 Questions With
Complete Solutions
_________________ is the percent change in speed required for
load change equal to the rated.
a. Speed governor
b. Governor speed drop
c. Governor speed increase
d. Throttle governing
e. Integral band Correct Answers B
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:
1) After stopping a hot turbine to prevent "hogging"
2) Only on small turbine
3) Continually when the turbine is not operating
4) Prior to start-up for approximately 3 hours
a. 1, 2, 4
b. 1, 2, 3
c. 1, 4
d. 2, 3
e. 2, 4 Correct Answers C
A barring gear turns a turbine over via:
a. Reduction gears.
b. Direct drive.
c. A hydraulic coupling.
d. A limited slip clutch.
,e. A hand operated crank. Correct Answers A
A jacking oil pump is used to:
1) Make slight adjustments to the turbine bearing housings
during overhaul to maintain alignment
2) Supply oil to a hydraulic motor for the turning gear
3) Supply oil to the bearings under the shaft at all times so
lubrication is assured
4) Supply a high volume of oil at high pressure
a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 3, 4
e. None of the above Correct Answers E - It supplies oil under
the bearings but not "at all times." Only before startup. It is shut
off when the speed is above 50-60 rpm
A jacking oil pump is used to:
1. Make slight adjustments to the turbine bearing housings
during overhaul to maintain alignment.
2. Supply oil under the shaft of the bearing for a specific time.
3. Supply oil to the bearings under the shaft at all times so
lubrication is assured.
4. Supply a low volume of oil at high pressure.
a. 1, 2, 3.
b. 2, 3, 4.
c. 1, 3, 4.
d. 3, 4.
, e. 2, 4. Correct Answers E
A mechanical overspeed trip is designed to _____ in the event of
an overspeed condition.
a. Prevent the turbine's speed from exceeding 150% of its rated
speed.
b. Activate an alarm.
c. Drop the turbine's load.
d. Shut off the turbine's steam supply.
e. Throttle the inlet steam. Correct Answers D
A simple mechanical governor uses a _____ attached to the end
of the turbine shaft.
a. Governor.
b. Speed pickup.
c. Set of weights.
d. Gear.
e. Pressure sensor. Correct Answers C
A speed sensitive governor may be:
1. Proportional.
2. Mechanical.
3. Mechanical-hydraulic.
4. Electronic-hydraulic.
a. 1, 2
b. 3, 4
c. 1, 2, 3
d. 2, 3, 4
e. 1, 2, 3, 4 Correct Answers D
Complete Solutions
_________________ is the percent change in speed required for
load change equal to the rated.
a. Speed governor
b. Governor speed drop
c. Governor speed increase
d. Throttle governing
e. Integral band Correct Answers B
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:
1) After stopping a hot turbine to prevent "hogging"
2) Only on small turbine
3) Continually when the turbine is not operating
4) Prior to start-up for approximately 3 hours
a. 1, 2, 4
b. 1, 2, 3
c. 1, 4
d. 2, 3
e. 2, 4 Correct Answers C
A barring gear turns a turbine over via:
a. Reduction gears.
b. Direct drive.
c. A hydraulic coupling.
d. A limited slip clutch.
,e. A hand operated crank. Correct Answers A
A jacking oil pump is used to:
1) Make slight adjustments to the turbine bearing housings
during overhaul to maintain alignment
2) Supply oil to a hydraulic motor for the turning gear
3) Supply oil to the bearings under the shaft at all times so
lubrication is assured
4) Supply a high volume of oil at high pressure
a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 3, 4
e. None of the above Correct Answers E - It supplies oil under
the bearings but not "at all times." Only before startup. It is shut
off when the speed is above 50-60 rpm
A jacking oil pump is used to:
1. Make slight adjustments to the turbine bearing housings
during overhaul to maintain alignment.
2. Supply oil under the shaft of the bearing for a specific time.
3. Supply oil to the bearings under the shaft at all times so
lubrication is assured.
4. Supply a low volume of oil at high pressure.
a. 1, 2, 3.
b. 2, 3, 4.
c. 1, 3, 4.
d. 3, 4.
, e. 2, 4. Correct Answers E
A mechanical overspeed trip is designed to _____ in the event of
an overspeed condition.
a. Prevent the turbine's speed from exceeding 150% of its rated
speed.
b. Activate an alarm.
c. Drop the turbine's load.
d. Shut off the turbine's steam supply.
e. Throttle the inlet steam. Correct Answers D
A simple mechanical governor uses a _____ attached to the end
of the turbine shaft.
a. Governor.
b. Speed pickup.
c. Set of weights.
d. Gear.
e. Pressure sensor. Correct Answers C
A speed sensitive governor may be:
1. Proportional.
2. Mechanical.
3. Mechanical-hydraulic.
4. Electronic-hydraulic.
a. 1, 2
b. 3, 4
c. 1, 2, 3
d. 2, 3, 4
e. 1, 2, 3, 4 Correct Answers D
