Valve overlap is the number of degrees of crankshaft rotation during which:
A. Both intake and exhaust valve are closed
B. Both intake and exhaust valve are open
C. The valves are moving from fully closed to the timing point
D. The valves float
Answer: Option B
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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