internal combustion engine (S.i. & c.i. engine)
MCQ
Q3. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft

(a) 1/2 
(b) 1
(c) 2
(d) 4

Ans: (c) 2


Explanation

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Explanation:

The working cycle of a four-stroke engine is completed in two revolutions of the crankshaft.

During the first revolution, the piston moves from top dead center (TDC) to bottom dead center (BDC) and back up to TDC. This is known as the intake stroke (where the air-fuel mixture is drawn into the cylinder), the compression stroke (where the mixture is compressed), and the power stroke (where the mixture is ignited, causing the piston to be move downward).

During the second revolution, the piston again moves from TDC to BDC and back up to TDC. This is known as the exhaust stroke (where the burnt gases are forced out from the cylinder).

So, the complete working cycle of a four-stroke engine is completed in two revolutions of the crankshaft.


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