Internal combustion engine mcqs Set - 14

Practice Test: Question Set - 14


1. The air-fuel ratio of the petrol engine is controlled by
    (A) Fuel pump
    (B) Governor
    (C) Injector
    (D) Carburettor

2. Which of the following statement is wrong?
    (A) In compression ignition engines, detonation occurs near the beginning of combustion.
    (B) Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.
    (C) To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
    (D) In compression ignition engines, because of heterogeneous mixture, the rate of pressure rise is comparatively lower.

3. In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
    (A) Beginning of suction stroke
    (B) End of suction stroke
    (C) Beginning of exhaust stroke
    (D) End of exhaust stroke

4. The exhaust valve in a four stroke cycle petrol engine
    (A) Opens at 50° before bottom dead center and closes at 15° after top dead center
    (B) Opens at bottom dead center and closes at top dead center
    (C) Opens at 50° after bottom dead center and closes at 15° before top dead center
    (D) May open and close anywhere

5. The expansion of fuel in a four stroke cycle diesel engine
    (A) Starts at 15° before top dead center and ends at 30° after top dead center
    (B) Starts at top dead center and ends at 30° after top dead center
    (C) Starts at 15° after top dead center and ends at 30° before bottom dead center
    (D) May start and end anywhere

6. In a diesel engine, the duration between the time of injection and ignition, is known as
    (A) Pre-ignition period
    (B) Delay period
    (C) Period of ignition
    (D) Burning period

7. The effective inhibitor of pre-ignition is
    (A) Alcohol
    (B) Water
    (C) Lead
    (D) None of these

8. A diesel engine has
    (A) One valve
    (B) Two valves
    (C) Three valves
    (D) Four valves

9. The pressure inside the cylinder is _________ the atmospheric pressure during the exhaust stroke.
    (A) Equal to
    (B) Below
    (C) Above
    (D) None of these

10. A carburettor is used to supply
    (A) Petrol, air and lubricating oil
    (B) Air and diesel
    (C) Petrol and lubricating oil
    (D) Petrol and air

11. Morse test can be conducted for
    (A) Petrol engines
    (B) Diesel engines
    (C) Multi cylinder engines
    (D) All of these

12. High speed compression engines operate on
    (A) Otto cycle
    (B) Diesel cycle
    (C) Dual combustion cycle
    (D) All of these

13. The theoretically correct mixture of air and petrol is
    (A) 10 : 1
    (B) 15 : 1
    (C) 20 : 1
    (D) 25 : 1

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

15. In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.
    (A) Fuel pump
    (B) Injector
    (C) Carburettor
    (D) None of these

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Internal Combustion Engines (I.C. Engines):
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