240 Important Internal Combustion Engines MCQ Question and Answer | PDF Free Download
1.The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
- A1 m3
- B5 m3
- C56 m3
- D910 m3
2.The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
- A½
- B1
- C2
- D4
3.Which of the following is not an intern’s combustion engine?
- A2-stroke petrol engine
- B4-stroke petrol engine
- CDiesel engine
- DSteam turbine
4.The inlet value of a four stroke cycle I.C engine remains open for nearly
- A180°
- B125°
- C235°
- D200°
5.In petrol engines, the delay period is of the order of
- A0.001 second
- B0.002 second
- C0.003 second
- D0.004 second
6.The theoretically correct air fuel ratio for petrol engine is of the order of
- A6: 1
- B9: 1
- C12: 1
- D15: 1
7.For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of
- A9 : 1
- B12 : 1
- C15 : 1
- D18 : 1
8.The maximum temperature in the I.C. engine cylinder is of the order of
- A500-1000°C
- B1000-1500°C
- C1500-2000°C
- D2000-2500°C
9.The basic requirement of a good combustion chamber is
- AMinimum turbulence
- BLow compression ratio
- CHigh thermal efficiency and power output
- DLow volumetric efficiency
10.If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is
- AV₁ / (V₀ + V₁)
- BV₀ / (V₀ + V₁)
- CV₀ / (V₀ + V₁)
- D2V₁ / (V₀ + V₁)
11.The accumulation of carbon in a cylinder results in increase of
- AClearance volume
- BVolumetric efficiency
- CIgnition time
- DEffective compression ratio
12.The mean effective pressure obtained from engine indicator indicates the
- AMaximum pressure developed
- BMinimum pressure
- CInstantaneous pressure at any instant
- DAverage pressure
13.All heat engines utilize
- ALow heat value of oil
- BHigh heat value of oil
- CNet calorific value of oil
- DCalorific value of fuel
14.The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
- AInject fuel in a chamber of high pressure at the end of compression stroke
- BInject fuel at a high velocity to facilitate atomization
- CEnsure that penetration is not high
- DAll of the above
15.In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
- AEqual to
- BBelow
- CAbove
- DNone of these
16.A higher compression ratio causes
- APre-ignition
- BIncrease in detonation
- CAcceleration in the rate of combustion
- DAny one of these
17.As a result of detonation in an I.C. engine, following parameter attains very high value
- APeak pressure
- BRate of rise of pressure
- CRate of rise of temperature
- DPeak temperature
18.Which of the following fuel has little tendency towards detonation?
- ABenzene
- BIso-octane
- CNormal heptanes
- DAlcohol
19.The reflectivity depends upon
- AGeometry of the reflector
- BEnergy of neutrons
- CProperties of the reflector
- DAll of these
20.Which is more viscous lube oil?
- ASEA 30
- BSAE 50
- CSAE 70
- DSAE 80