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If L is the stroke and N is the rpm, mean piston speed of two stroke engine is _______

a) LN
b) LN/2
c) 2LN
d) 2LN/3

Answer: c
Explanation: The mean piston speed is the average speed of the piston in a reciprocating engine. It is a function of stroke and RPM. There is a factor of 2 in the equation to consider one stroke to occur in ½ of a crank revolution.

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