I.C Engines-online practice test - Set 07 - ObjectiveBooks
I.C Engines-online practice test - Set 07

I.C Engines-online practice test - Set 07

Practice Test: Question Set - 07

1. Which of the following fuel detonates readily?
    (A) Benzene
    (B) Iso-octane
    (C) Normal heptane
    (D) Alcohol
2. In a typical medium speed 4-stroke cycle diesel engines
    (A) Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
    (B) Exhaust valve opens at bottom dead center and closes at top dead center
    (C) Exhaust valve opens just after bottom dead center and closes just before top dead center
    (D) May open and close anywhere
3. During idling, a petrol engine requires _________ mixture.
    (A) Lean
    (B) Rich
    (C) Chemically correct
    (D) None of these
4. The air-fuel ratio in petrol engines is controlled by
    (A) Controlling valve opening/closing
    (B) Governing
    (C) Injection
    (D) Carburetion
5. The function of a distributor in a coil ignition system of I.C. engines is
    (A) To distribute spark
    (B) To distribute power
    (C) To distribute current
    (D) To time the spark
6. The specific fuel consumption per BH hour for a petrol engine is approximately
    (A) 0.15 kg
    (B) 0.2 kg
    (C) 0.25 kg
    (D) 0.3 kg
7. In a four stroke cycle petrol engine, the expansion
    (A) Starts at top dead center and ends at bottom dead center
    (B) Starts at 30° before top dead center and ends at 50° before bottom dead center
    (C) Starts at 30° after top dead center and ends at 50° after bottom dead center
    (D) May start and end anywhere
8. Which of the following is false statement?
Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following
    (A) Piston ring and cylinder wear
    (B) Formation of hard coating on piston skirts
    (C) Oil sludge in the engine crank case
    (D) Detonation
9. As compared to air standard cycle, in actual working, the effect of variation in specific heats is to
    (A) Increase maximum pressure and maximum temperature
    (B) Reduce maximum pressure and maximum temperature
    (C) Increase maximum pressure and decrease maximum temperature
    (D) Decrease maximum pressure and increase maximum temperature
10. Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads
    (A) The friction is high
    (B) The friction is unpredictable
    (C) The small difference in cooling water temperature or in internal friction has a disproportionate effect
    (D) The engine is rarely operated
11. By higher octane number of spark ignition fuel, it is meant that the fuel has
    (A) Higher heating value
    (B) Higher flash point
    (C) Lower volatility
    (D) Longer ignition delay
12. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
    (A) 250°C
    (B) 500°C
    (C) 1000°C
    (D) 2000°C
13. A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
    (A) 248 cm3
    (B) 252 cm3
    (C) 264 cm3
    (D) 286 cm3
14. In a typical medium speed 4-stroke cycle diesel engine
    (A) Compression starts at 35° after bottom dead center and ends at top dead center
    (B) Compression starts at bottom dead center and ends at top dead center
    (C) Compression starts at 10° before bottom dead center and, ends just before top dead center
    (D) May start and end anywhere
15. In a petrol engine, the mixture has the lowest pressure at the
    (A) Beginning of suction stroke
    (B) End of suction stroke
    (C) End of compression stroke
    (D) None of these
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