Q. A two stroke engine has a speed of 750 rpm. A four stroke engine having an identical cylinder size running at 1500 rpm. The theoretical output of the two stroke engine will be :

A
twice that of the four stroke engine
B
half that of the four stroke engine
C
the same as that of the four stroke engine
D
depend upon whether it is a CI or ST engine
Solution:
  • Number of working strokes per min. for a two stroke cycle engine are equal to the speed of the engine in r.p.m.
  • While number of working strokes per min. for a four stroke cycle engine are one half the speed of the engine in r.p.m.
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