Which one of following quantities is assumed constant for an internal combustion engine while estimating its friction power by extrapolation through Willan's line?

Which one of following quantities is as

1.	Which one of following quantities is assumed constant for an internal combustion engine while estimating its friction power by extrapolation through Willan's line?
A.	Brake thermal efficiency
B.	Indicated thermal efficiency
C.	Mechanical efficiency
D.	Volumetric efficiency
Answer» C. Mechanical efficiency

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Which one of following quantities is assumed constant for an internal combustion engine while estimating its friction power by extrapolation through Willan's line?

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