Power Engineering 3B2 ch2 (Steam Turbine Auxiliaries & Operation) Questions With Complete Solutions

Power Engineering 3B2 ch2 (Steam Turbine Auxiliaries &
Operation) Questions With Complete Solutions


When starting a condensing or extraction turbine, the extraction
(condensate) pump is started _____ the _____.
1) before
2) after
3) air ejector
4) jacking oil pump
5) condenser circulating water pump
Select one:
A. 1, 3
B. 2, 3
C. 1, 4
D. 1, 5
E. 2, 5
C
In order to supply oil at two different pressures, a typical turbine
lube oil system has:
Select one:
A. One centrifugal pump and one reciprocating positive
displacement pump
B. One shaft driven pump comprising both high and low
pressure sections
C. One shaft drive high pressure pump and an electric low
pressure pump

,D. A pressure reducing valve
E. A separate pump for each system
D
The two types of Governors used on steam turbines are:
1. Flow sensitive governor
2. Pressure sensitive governor
3. Temperature sensitive governor
4. Speed sensitive governor
Select one:
A. 2, 4
B. 1, 4
C. 1, 2
D. 2, 3
E. 3, 4
A
A speed sensitive governor may be:
1.Electronic only
2.Mechanical
3.Mechanical-hydraulic
4.Electronic-hydraulic
Select one:
A. 1
B. 3, 4
C. 1, 2, 3
D. 2, 3, 4
E. 1, 2, 3, 4
D

, _____ is the percentage change in speed of a steam turbine from
no load to full load conditions.
Select one:
A. Speed governor range
B. Governor speed droop
C. Governor speed increase
D. Throttling range
E. Proportional speed
B
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 ___________.
Select one:
A. Expand
B. Bend upwards
C. Twist
D. Bend downwards
E. Stall
B
Lubricating oil for a turbine may:
1. Lubricate bearings.
2. Lubricate gears.
3. Operate throttle valves.
4. Be supplied to a governor.
Select one:
A. 1, 2
B. 3, 4