IC Engines MCQ Practice Test - ObjectiveBooks

IC Engines MCQ Practice Test

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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