Relative efficiency is the ratio of
A. Brake Power to Indicated Power
B. Mechanical efficiency to Thermal efficiency
C. Actual thermal efficiency to Volumetric efficiency
D. Actual thermal efficiency to Air-standard efficiency
Answer: Option D
This Question Belongs to Automobile Engineering >> Performance And Testing Of Engines
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Mechanical efficiency of an automobile engine usually varies in the range:
A. 50% - 60%
B. 60% - 70%
C. 70% - 90%
D. More than 90%
A. Increase
B. Decrease
C. Independent
D. None of the above
How many times in a minute does each valve on a 4-stroke engine running at 2000 rpm open and close?
A. 1000
B. 2000
C. 4000
D. 6000
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