Practice Test: Question Set - 17
1. The brake power is the power available
- (A) In the
engine cylinder
- (B) At the crank
shaft
- (C) At the crank
pin
- (D) None of
these
2. The normal heptane (C₇H₁₆) is given a rating of ________ octane number.
- (A) 0
- (B) 50
- (C) 100
- (D) 120
3. The knocking in diesel engines may be prevented by
- (A) Reducing the
delay period
- (B) Raising the
compression ratio
- (C) Increasing
the inlet pressure of air
- (D) All of these
4. The air-fuel ratio of the petrol engine is controlled by
- (A) Carburettor
- (B) Injector
- (C) Governor
- (D) None of
these
5. If the compression ratio in I.C. engine increases, then its thermal efficiency will
- (A) Decrease
- (B) Increase
- (C) Remain same
- (D) None of
these
6. The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be
- (A) 25%
- (B) 50%
- (C) 70%
- (D) 100%
7. The octane number of petrol, generally available, is
- (A) 20 to 40
- (B) 40 to 60
- (C) 60 to 80
- (D) 80 to 100
8. The object of supercharging the engine is
- (A) To reduce
mass of the engine per brake power
- (B) To reduce
space occupied by the engine
- (C) To increase
the power output of an engine when greater power is required
- (D) All of the
above
9. The increase of cooling water temperature in petrol engine will _________ the knocking tendency.
- (A) Not effect
- (B) Decrease
- (C) Increase
- (D) None of
these
10. The specific fuel consumption per B.P. hour for a diesel engine is about
- (A) 0.2 kg
- (B) 0.25 kg
- (C) 0.3 kg
- (D) 0.35 kg
11. The injection pressure in a diesel engine is about
- (A) 10 bar
- (B) 100 bar
- (C) 150 bar
- (D) 500 bar
12. Morse test is used to determine the I.P. of a
- (A) Single
cylinder petrol engine
- (B) Four stroke
engine
- (C) Single
cylinder diesel engine
- (D) Multi
cylinder engine
13. The voltage required to produce a spark across the gap, between the sparking points is
- (A) 2000 to 4000
volts
- (B) 4000 to 6000
volts
- (C) 6000 to
10,000 volts
- (D) 10,000 to
12,000 volts
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