MCQ on IC engine - Set 16 - ObjectiveBooks

MCQ on IC engine - Set 16

Practice Test: Question Set - 16

1. A spark plug gap is kept from
    (A) 0.3 to 0.7 mm
    (B) 0.2 to 0.8 mm
    (C) 0.4 to 0.9 mm
    (D) 0.6 to 1.0 mm

2. The air standard efficiency of an I.C. engine depends on
    (A) Fuel used
    (B) Speed of engine
    (C) Compression ratio
    (D) None of these

3. Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of
    (A) 0
    (B) 50
    (C) 100
    (D) 120

4. The increase in intake temperature of internal combustion engines will _________ efficiency.
    (A) Have no effect on
    (B) Increase
    (C) Decrease
    (D) None of these

5. The thermal efficiency of a petrol engine is _________ as compared to diesel engine.
    (A) Same
    (B) Less
    (C) More
    (D) None of these

6. The thermal efficiency of diesel engines is about
    (A) 15%
    (B) 30%
    (C) 50%
    (D) 70%

7. The ignition quality of diesel oil is expressed by
    (A) Cetane number
    (B) Octane number
    (C) Calorific value
    (D) None of these

8. If petrol is used in a diesel engine, then
    (A) Low power will be produced
    (B) Efficiency will be low
    (C) Higher knocking will occur
    (D) Black smoke will be produced

9. In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to
    (A) Prevent sparking across the gap between the points
    (B) Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
    (C) Both (A) and (B)
    (D) None of the above

10. The _________ engines can work on very lean mixture of fuel.
    (A) Spark ignition
    (B) Compression ignition
    (C) Both (A) and (B)
    (D) None of these

11. A diesel engine, during suction stroke, draws
    (A) Air only
    (B) Diesel only
    (C) A mixture of diesel and air
    (D) None of these

12. Antiknock for compression ignition engines is
    (A) Napthene
    (B) Tetra ethyl lead
    (C) Amyl nitrate
    (D) Hexadecane

13. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
    (A) Morse test
    (B) Prony brake test
    (C) Motoring test
    (D) Heat balance test

14. The cetane number of diesel oil, generally available, is
    (A) 20 to 25
    (B) 25 to 30
    (C) 30 to 40
    (D) 40 to 55

15. A petrol engine has compression ratio from
    (A) 6 to 10
    (B) 10 to 15
    (C) 15 to 25
    (D) 25 to 40

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