CS/B.TECH (PWE)/SEM-8/PWE-801/2012
2012
THERMAL POWER PLANT OPERATION
AND MAINTENANCE
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
( Multiple Choice Type Questions )
1. Choose the correct alternatives for the following :
10 × 1 = 10
i) In a coal based modern thermal power station time
required from light up to synchronization during cold
start up under normal operating conditions considering
all equipment availability is
a) 2 Hrs b) 3 Hrs
c) 4 Hrs d) 5 Hrs.
ii) In the pre-check for boiler light up, it is to be ensured
that the
a) safety valves are gagged
b) drum vent is closed
c) soot blowers are in advanced position
d) none of these.
iii) A boiler gas pass is purged before light up in order to
a) warm up the gas pass
b) cool down the gas pass
c) remove deposits from metal surface
d) remove unburnt combustibles from boiler.
iv) Which is not the critical speed of the turbine ?
a) 1585 rpm b) 2489 rpm
c) 2879 rpm d) 1881 rpm.
v) If high pressure turbine, metal temperature is above
350° C, the type of start to be chosen is
a) hot start b) warm start
c) cold start d) none of these.