A frictionless heat engine can be 100% efficient only if its exhaust temperature is
A. Eual to its input temperature
B. Less than its input temperature
C. 0°C
D. 0 K
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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