I.C Engines Multiple Choice Questions with Answers - Set 02

Practice Test: Question Set - 02


1. If the temperature of intake air in internal combustion engine increases, then its efficiency will
    (A) Remain same
    (B) Decrease
    (C) Increase
    (D) None of these

2. The operation of forcing additional air under pressure in the engine cylinder is known as
    (A) Scavenging
    (B) Turbulence
    (C) Supercharging
    (D) Pre-ignition

3. The ignition quality of petrol is expressed by
    (A) Cetane number
    (B) Octane number
    (C) Calorific value
    (D) All of these

4. The mean effective pressure obtained from engine indicator indicates the
    (A) Maximum pressure developed
    (B) Minimum pressure
    (C) Instantaneous pressure at any instant
    (D) Average pressure

5. The probability of knocking in diesel engines is increased by
    (A) High self ignition temperature
    (B) Low volatility
    (C) Higher viscosity
    (D) All of these

6. Pour point of fuel oil is the
    (A) Minimum 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
    (B) Temperature at which it solidifies or congeals
    (C) It catches fire without external aid
    (D) Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

7. In a four stroke cycle petrol engine, the compression
    (A) Starts at 40° after bottom dead centre and ends at 30° before top dead centre
    (B) Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
    (C) Starts at bottom dead centre and ends at top dead centre
    (D) May start and end anywhere

8. The maximum temperature in the I.C. engine cylinder is of the order of
    (A) 500-1000°C
    (B) 1000-1500°C
    (C) 1500-2000°C
    (D) 2000-2500°C

9. In compression ignition engines, swirl denotes a
    (A) Haphazard motion of the gases in the chamber
    (B) Rotary motion of the gases in the chamber
    (C) Radial motion of the gases in the chamber
    (D) None of the above

10. Supercharging is the process of
    (A) Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
    (B) Providing forced cooling air
    (C) Injecting excess fuel for raising more loads
    (D) Supplying compressed air to remove combustion products fully

11. The knocking in spark ignition engines can be reduced by
    (A) Retarding the spark
    (B) Increasing the engine speed
    (C) Both (A) and (B)
    (D) None of these

12. An engine indicator is used to determine the following
    (A) Speed
    (B) Temperature
    (C) Volume of cylinder
    (D) m.e.p. and I.H.P.

13. In a four stroke cycle diesel engine, the exhaust valve
    (A) Opens at 30° before bottom dead centre and closes at 10° after top dead centre
    (B) Opens at 30° after bottom dead centre and closes at 10° before top dead centre
    (C) Opens at bottom dead centre and closes at top dead centre
    (D) May open and close anywhere

14. The pressure at the end of compression in the case of diesel engine is of the order of
    (A) 6 kg/cm
    (B) 12 kg/cm
    (C) 20 kg/cm
    (D) 35 kg/cm

15. The fuels in order of decreasing knock tendency for spark ignition engines are
    (A) Paraffin, aromatic, napthene
    (B) Paraffin, napthene, aromatic
    (C) Napthene, aromatics, paraffin
    (D) Napthene, paraffin, aromatic

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Internal Combustion Engines (I.C. Engines):
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