Question

Number of working strokes per min. for a two stroke cycle engine are ____________ the speed of the engine in r.p.m.

(a) equal to

(b) one-half

(c) twice

(d) four-times

I have been asked this question during an interview.

Origin of the question is Comparison of Two Stroke S.I. and C.I. Engines in portion Two Stroke Engines of IC Engine

Answer 1

The correct answer is:

(c) twice

 Explanation:

In a two-stroke engine, there are two working strokes (one compression stroke and one power stroke) per revolution of the crankshaft. This means that the number of working strokes per minute (in terms of power strokes) is twice the speed of the engine in revolutions per minute (r.p.m.).

For every crankshaft revolution, a power stroke occurs, so if the engine is running at, for example, 1000 r.p.m., it will have 1000 working strokes per minute. Therefore, in a two-stroke engine, the number of working strokes is twice the r.p.m..

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