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Question

In a four stroke engine, for how much angular displacement of crank shaft, the exhaust valve actually remains open

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A.

180°

B.

More than 180°

C.

Less than 180°

D.

360°

Answer ( Option B)

More than 180°

Solution

The exhaust valve in a four stroke cycle petrol engine opens at 50º before bottom dead center and closes at 15º after top dead center while the inlet valve, opens at 20º before top dead center and closes at 40º after bottom dead centre

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