Center b opens at top dead center and closes at

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
Correct Answer
2. The operation of forcing additional air under pressure into the engine cylinder
is known as
Correct Answer
3. Compression ratio of I.C. Engines is

4. The air standard efficiency of an I.C. engine is given by (where r = Compression
ratio, and γ = Ratio of specific heats)
)
Correct Answer
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
Correct Answer
6. Number of working strokes per min. for a four stroke cycle engine are _________
the speed of the engine in r.p.m.
Correct Answer
7. The theoretically correct air fuel ratio for petrol engine is of the order of

(B) 9: 1
(C) 12: 1
(D) 15: 1
Correct Answer
8. In an internal combustion engine, the process of removing the burnt gases
from the combustion chamber of the engine cylinder is known as
Correct Answer
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
Correct Answer