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On modern four stroke engines the exhaust valve opens just

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On modern four stroke engines the exhaust valve opens just

(a) Before TDC

(b) After TDC

(c) Before BDC

(d) After BDC

I have been asked this question by my school teacher while I was bunking the class.

I need to ask this question from Engine Valves and their Mechanisms topic in section Internal Combustion Engines of Automobile Engineering

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Best answer
The correct choice is (c) Before BDC

Easiest explanation: Exhaust valve opens before the piston reaches Bottom Dead Centre.

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