CS/B.TECH/PWE(NEW)/SEM-6/PWE-603/2013
2013
INTERNAL COMBUSTION ENGINES
AND GAS TURBINES
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) Combined cycle efficiency is around
a) 65% b) 59%
c) 47% d) 37%.
ii) Ideally what should be the MW ratio of power generation
for a GTG : STG power plant ?
a) 1 : 2 b) 2 : 1
c) 1 : 3 d) 3 : 1.
iii) In reheat gas turbine cycle, the relation between the
temperature ratios for optional work output is
a) t=
t1t2b) ) t=t1t2
c) t= t1= t2d) t=t1=t2
iv) The work output of theoretical Otto cycle
a) increases with increase in compression ratio
b) increases with increase in pressure ratio
c) increases with increase in adiabatic index
d) follows all of these.
v) Stoichiometric air-fuel ratio by mass for combustion of
petrol is
a) 5 b) 10
c) 12 d) 15·05.
vi) The fuel-air ratio, for maximum power of S.I. engines,
should be
a) lean b) rich
c) may be lean or rich d) chemically correct.