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Which among the following is the correct formula of the compression ratio in terms of clearance volume and swept volume?

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Which among the following is the correct formula of the compression ratio in terms of clearance volume and swept volume?

(a) R= swept volume+clearance volume

(b) R=swept volume-clearance volume

(c) R=2×(swept volume-clearance volume)

(d) R=(swept volume+clearance volume)/clearance volume

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The origin of the question is Engine Components topic in division Basic Engine Components of Automotive Engine Design

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Right choice is (d) R=(swept volume+clearance volume)/clearance volume

Easy explanation: The compression ratio indicates the extent to which the charge in the engine is compressed. This is calculated as the ratio of the volume above the piston at B.D.C to the volume above the piston at T.D.C.R=(swept volume+clearance volume)/clearance volume.

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