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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