I.C Engines Objective Questions with Answers - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. In a typical medium speed 4-stroke cycle diesel engine the inlet valve
(A) Opens at 20° before top dead center and closes at 35° after the bottom dead center
(B) Opens at top dead center and closes at bottom dead center
(C) Opens at 10° after top dead center and closes 20° before the bottom dead center
(D) May open or close anywhere

2. The operation of forcing additional air under pressure into the engine cylinder is known as
(A) Supercharging
(B) Carburetion
(C) Turbulence
(D) Delay period

3. Compression ratio of I.C. Engines is
(A) The ratio of volumes of air in cylinder before compression stroke and after compression stroke
(B) Volume displaced by piston per stroke and clearance volume in cylinder
(C) Ratio of pressure after compression and before compression
(D) Swept volume/cylinder volume

4. The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and Î³ = Ratio of specific heats)
(A) 1 - rÎ³ - 1
(B) 1 + rÎ³ - 1
(C) 1 - (1/rÎ³ - 1)
(D) None of these

5. Pick up the wrong statement about supercharging
(A) Supercharging reduces knocking in diesel engines
(B) There can be limited supercharging in petrol engines because of detonation
(C) Supercharging at high altitudes is essential
(D) Supercharging results in fuel economy

6. Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.
(A) Equal to
(B) One-half
(C) Twice
(D) Four-times

7. The theoretically correct air fuel ratio for petrol engine is of the order of
(A) 6: 1
(B) 9: 1
(C) 12: 1
(D) 15: 1

8. In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
(A) Scavenging
(B) Detonation
(C) Supercharging
(D) Polymerisation

9. In the opposed piston diesel engine, the combustion chamber is located
(A) Above the piston
(B) Below the piston
(C) Between the pistons
(D) There is no such criterion

10. The ignition of the charge by some hot surface within the engine before the passage of spark is called
(A) Pre-ignition
(B) Detonation
(C) Ignition delay
(D) Auto-ignition

11. In a typical medium speed, 4-stroke cycle diesel engine
(A) Fuel injection starts at 10° before top dead center and ends at 20° after top dead center
(B) Fuel injection starts at top dead center and ends at 20° after top dead center
(C) Fuel injection starts at just before top dead center and ends just after top dead center
(D) May start and end anywhere

12. Which one of the following engines will have heavier flywheel than the remaining ones?
(A) 30 kW four-stroke petrol engine running at 1500 r.p.m.
(B) 30 kW two-stroke petrol engine running at 1500 r.p.m.
(C) 30 kW two-stroke diesel engine running at 750 r.p.m.
(D) 30 kW four-stroke diesel engine running at 750 r.p.m.

13. Which of the following is the lightest and most volatile liquid fuel?
(A) Diesel
(B) Kerosene
(C) Fuel oil
(D) Gasoline

14. The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.
(A) Low
(B) Very low
(C) High
(D) Very high

15. The rating of a diesel engine, with increase in air inlet temperature, will
(A) Increase linearly
(B) Decrease linearly
(C) Increase parabolically
(D) Decrease parabolically

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