Internal Combustion Engines Objective - Set 09 - ObjectiveBooks

Internal Combustion Engines Objective - Set 09

Practice Test: Question Set - 09

1. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
    (A) Mechanical efficiency
    (B) Overall efficiency
    (C) Indicated thermal efficiency
    (D) Volumetric efficiency

2. The size of inlet valve of an engine in comparison to exhaust valve is
    (A) More
    (B) Less
    (C) Same
    (D) More/less depending on capacity of engine

3. The volumetric efficiency of a well designed engine may be
    (A) 30 to 40%
    (B) 40 to 60%
    (C) 60 to 70%
    (D) 75 to 90%

4. A 5 BHP engine running at full load would consume diesel of the order of
    (A) 0.3 kg/hr
    (B) 1 kg/hr
    (C) 3 kg/hr
    (D) 5 kg/hr

5. A petrol engine, during suction stroke draws
    (A) Air only
    (B) Petrol only
    (C) A mixture of petrol and air
    (D) None of these

6. Which of the following statements is correct?
    (A) All the irreversible engines have same efficiency
    (B) All the reversible engines have same efficiency
    (C) Both Rankine and Carnot cycles have same efficiency between same temperature limits
    (D) All reversible engines working between same temperature limits have same efficiency

7. The fuel valve in a four stroke cycle diesel engine
    (A) Opens at 15° after top dead center and closes at 20° before bottom dead center
    (B) Opens at 15° before top dead center and closes at 20° after top dead center
    (C) Opens at top dead center and closes at bottom dead center
    (D) May open and close anywhere

8. For the same power developed in I.C. engines, the cheaper system is
    (A) Naturally aspirated
    (B) Supercharged
    (C) Centrifugal pump
    (D) Turbo charger

9. The thermal efficiency of petrol and gas engines is about
    (A) 15%
    (B) 30%
    (C) 50%
    (D) 70%

10. Which is more viscous lube oil?
    (A) SEA 30
    (B) SAE 50
    (C) SAE 70
    (D) SAE 80

11. In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.
    (A) Not effected
    (B) Decrease
    (C) Increase
    (D) None of these

12. Fuel oil consumption guarantees for I .C. engine are usually based on
    (A) Low heat value of oil
    (B) High heat value of oil
    (C) Net calorific value of oil
    (D) Calorific value of fuel

13. The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
    (A) Jet area is automatically varied depending on the suction
    (B) The flow from the main jet is diverted to the compensating jet with increase in speed
    (C) The diameter of the jet is constant and the discharge coefficient is invariant
    (D) Flow is produced due to the static head in the float chamber

14. The magneto in an automobile is basically
    (A) Transformer
    (B) D.C. generator
    (C) Capacitor
    (D) Magnetic circuit

15. In order to eliminate knocking in compression ignition engines, there should be
    (A) Short delay period
    (B) Late auto-ignition
    (C) Low compression ratio
    (D) High self ignition temperature of fuel

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