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What is the minimum cranking speed for a reciprocating S.I engine?(a) 150-180rpm(b) 60 to 140rpm(c) 60-90rpm(d) 100-200rpmThis question was addressed to me in an online quiz.Question is from Starting Motor Switches and Control Circuit in chapter Starting System of Automotive Engine Design

Answer»

The correct choice is (C) 60-90rpm

Easy explanation: The MINIMUM CRANKING speed for a reciprocating S.I ENGINE is 60-90rpm, for the rotary engine it is 60-90rpm and for the C.I engine with glow plugs is 60-140rpm.



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