I.C Engines Objective Questions with Answers - Set 08

Practice Test: Question Set - 08


1. The specific fuel consumption per BHP hour for diesel engine is approximately
    (A) 0.15 kg
    (B) 0.2 kg
    (C) 0.25 kg
    (D) 0.3 kg

2. Which of the following statement is correct?
    (A) Compression ratio for petrol engines varies from 6 to 10
    (B) Higher compression ratio in diesel engines results in higher pressures
    (C) Petrol engines work on Otto cycle
    (D) All of the above

3. All heat engines utilize
    (A) Low heat value of oil
    (B) High heat value of oil
    (C) Net calorific value of oil
    (D) Calorific value of fuel

4. Which of the following statement is wrong?
    (A) A four stroke cycle engine develops twice the power as that of a two stroke cycle engine
    (B) For the same power developed, a four stroke cycle engine is lighter, less bulky and occupies less floor area
    (C) The petrol engines are costly than diesel engines
    (D) All of the above

5. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?
    (A) Yes
    (B) No
    (C) To some extent
    (D) Unpredictable

6. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
    (A) Inlet valve closing after bottom dead center
    (B) Inlet valve closing before bottom dead center
    (C) Inlet valve opening before top dead center
    (D) Exhaust valve closing after top dead center

7. In a diesel engine, the fuel is ignited by
    (A) Spark
    (B) Injected fuel
    (C) Heat resulting from compressing air that is supplied for combustion
    (D) Ignition

8. Which of the following does not relate to a spark ignition engine?
    (A) Ignition coil
    (B) Spark plug
    (C) Carburettor
    (D) Fuel injector

9. Compression loss in I.C engines occurs due to
    (A) Leaking piston rings
    (B) Use of thick head gasket
    (C) Clogged air inlet slots
    (D) All of the above

10. Iso-octane (C₈H₁₈) has octane number of
    (A) 0
    (B) 50
    (C) 100
    (D) 120

11. As a result of detonation in an I.C. engine, following parameter attains very high value
    (A) Peak pressure
    (B) Rate of rise of pressure
    (C) Rate of rise of temperature
    (D) Peak temperature

12. A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
    (A) Half
    (B) Same
    (C) Double
    (D) Four times

13. The accumulation of carbon in a cylinder results in increase of
    (A) Clearance volume
    (B) Volumetric efficiency
    (C) Ignition time
    (D) Effective compression ratio

14. In a four stroke cycle engine, the sequence of operations is
    (A) Suction, compression, expansion and exhaust
    (B) Suction, expansion, compression and exhaust
    (C) Expansion, compression, suction and exhaust
    (D) Compression, expansion, suction and exhaust

15. Gaseous fuel guarantees are based on
    (A) Calorific value of oil
    (B) Low heat value of oil
    (C) High heat value of oil
    (D) Mean heat value of oil

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Internal Combustion Engines (I.C. Engines):
  Set 01      Set 02      Set 03      Set 04      Set 05      Set 06      Set 07      Set 08      Set 09
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