191. The combustion in compression ignition engines is
homogeneous
hetrogeneous
both (a) and (b)
none of these
✅ The correct answer is option B.
IC Engines and Nuclear Power Plants MCQs
192. In petrol engines, advancing of the spark timing will __________ the knocking tendency.
not effect
decrease
increase
✅ The correct answer is option C.
193. The octane number of petrol, generally available, is
20 to 40
40 to 60
60 to 80
80 to 100
✅ The correct answer is option D.
194. A supercharged engine as compared to an ordinary engine
requires smaller foundation
is lighter
consumes less lubricating oil
all of these
✅ The correct answer is option D.
195. In compression ignition engines, swirl denotes a
haphazard motion of the gases in the chamber
rotary motion of the gases in the chamber
radial motion of the gases in the chamber
none of the above
✅ The correct answer is option B.
196. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
low density
low temperature
long ignition delay
all of these
✅ The correct answer is option D.
197. The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
inject fuel in a chamber of high pressure at the end of compression stroke
inject fuel at a high velocity to facilitate atomisation
ensure that penetration is not high
all of the above
✅ The correct answer is option D.
198. The increase in intake temperature of internal combustion engines will __________ efficiency.
have no effect on
increase
decrease
✅ The correct answer is option C.
199. The cylinder of a gas engine is made __________ than that of the petrol engine.
smaller
larger
✅ The correct answer is option B.
200. The frictional power (F.P.) is given by
F.P. = B.P. – I.P.
F.P. = I.P. – B.P.
F.P. = B.P./I.P.
F.P. = I.P./B.P.
✅ The correct answer is option B.