171. The voltage required to produce a spark across the gap, between the sparking points is
2000 to 4000 volts
4000 to 6000 volts
6000 to 10 000 volts
10 000 to 12 000 volts
✅ The correct answer is option C.
IC Engines and Nuclear Power Plants MCQs
172. The two stroke cycle engines have lighter flywheel.
Agree
Disagree
✅ The correct answer is option A.
173. In diesel engines, the ignition takes place due to the heat produced in the engine cylinder at the end of compression.
Correct
Incorrect
✅ The correct answer is option A.
174. The running cost of a petrol engine is __________ than that of a diesel engine.
higher
lower
✅ The correct answer is option A.
175. For the same maximum pressure and heat input, the exhaust temperature of petrol engine is __________ than that of diesel engine.
less
more
✅ The correct answer is option B.
176. The increase of efficiency of a compression ignition engine, as the load decreases, is due to
higher maximum temperature
qualitative governing
quantitative governing
hit and miss governing
✅ The correct answer is option B.
177. A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
248 cm3
252 cm3
264 cm3
286 cm3
✅ The correct answer is option C.
178. The scavenging efficiency of a four stroke cycle diesel engine is
below 50%
between 50 and 85%
between 85 and 95%
between 95 and 100%
✅ The correct answer is option D.
179. In a coil ignition system of petrol engines, a condenser is connected across the contact-breaker in order to
prevent sparking across the gap between the points
cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
both (a) and (b)
none of the above
✅ The correct answer is option C.
180. The correct mixture strength (by weight) for petrol is about
14.6:1
18.5:1
20.4:1
22.6:1
✅ The correct answer is option A.