CS/B.Tech/PWE/SEM-8/PWE-801/2013
2013
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 any ten of the following :
10 × 1 = 10
i) If saturated steam at a pressure of 20 kg/cm2 (a) is
reduced to 10 kg/cm2 (a) through a pressure reducing
valve, the steam will
a) condense
b) remain saturated
c) get superheated
d) be a mixture of 50% steam and 50% condensate.
ii) The amount of theoretical air required for complete
combustion of one ton of coal as compared to that
required for one ton of fuel oil is
a) higher b) lower
c) equal d) none of these.
iii) A rise in conductivity of boiler feed water indicates
a) drop in the contamination of feed water
b) greater purity of feed water
c) rise in the contamination of feed water
d) it has got no relation with the contamination of
feed water.
iv) Which of the following best indicates the overall
efficiency of a combined cycle thermal power plant ?
a) 33% b) 42%
c) 55% d) 60%.
v) High % of carbon monoxide presence in the flue gas of
boiler is an indicator of
a) high excess air
b) complete combustion
c) good control of pollutants
d) low excess air.