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Which force is the reason for the downward moment of the piston during power stroke?

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Which force is the reason for the downward moment of the piston during power stroke?

(a) Fuel pressure

(b) Gas pressure

(c) Solid pressure

(d) Liquid pressure
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Right choice is (b) Gas pressure

To explain: Pistons transmit the force due to gas pressure inside the cylinder to the crankshaft through the connecting rod. The gas pressure is created by the combustion inside the engine.
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