240 Important Internal Combustion Engines MCQ Question and Answer | PDF Free Download
1.The increase of cooling water temperature in petrol engine will _________ the knocking tendency.
- ANot effect
- BDecrease
- CIncrease
- DNone of these
2.In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.
- ANot effected
- BDecrease
- CIncrease
- DNone of these
3.In petrol engines, advancing of the spark timing will _________ the knocking tendency.
- ANot effect
- BDecrease
- CIncrease
- DNone of these
4.The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.
- AIncrease
- BReduce
- CNot effect
- DNone of these
5.The advancing of spark timing in spark ignition engines will _________ knocking tendency.
- AIncrease
- BReduce
- CNot effect
- DNone of these
6.The compression ignition engines are governed by
- AHit and miss governing
- BQualitative governing
- CQuantitative governing
- DCombination of (B) and (C)
7.The spark ignition engines are governed by
- AHit and miss governing
- BQualitative governing
- CQuantitative governing
- DCombination of (B) and (C)
8.In a four stroke cycle petrol engine, the charge is ignited at
- A30° before top dead center
- B30° after top dead center
- C30° before bottom dead center
- D30° after bottom dead center
9.The increase of efficiency of a compression ignition engine, as the load decreases, is due to
- AHigher maximum temperature
- BQualitative governing
- CQuantitative governing
- DHit and miss governing
10.In the crankcase method of scavenging, the air pressure is produced by
- ASupercharger
- BCentrifugal pump
- CNatural aspirator
- DMovement of engine piston
11.Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
- AHalf
- BSame
- CDouble
- DFour times
12.Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
- AEqual to
- BLess than
- CGreater than
- DNone of these
13.The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.
- ALow
- BVery low
- CHigh
- DVery high
14.Flash point of fuel oil is
- AMinimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
- BTemperature at which it solidifies or congeals
- CTemperature at which it catches fire without external aid
- DIndicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
15.The pressure at the end of compression in the case of diesel engine is of the order of
- A6 kg/cm
- B12 kg/cm
- C20 kg/cm
- D35 kg/cm
16.The probability of knocking in diesel engines is increased by
- AHigh self ignition temperature
- BLow volatility
- CHigher viscosity
- DAll of these
17.If the temperature of intake air in internal combustion engine increases, then its efficiency will
- ARemain same
- BDecrease
- CIncrease
- DNone of these
18.If the intake air temperature of I.C. engine increases, its efficiency will
- AIncrease
- BDecrease
- CRemain same
- DNone of these
19.It the temperature of intake air in IC engines is lowered, then its efficiency will
- AIncrease
- BDecrease
- CRemain same
- DIncrease up to certain limit and then decrease
20.The voltage required to produce a spark across the gap, between the sparking points is
- A2000 to 4000 volts
- B4000 to 6000 volts
- C6000 to 10,000 volts
- D10,000 to 12,000 volts