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What is the minimum cranking speed for a C.I engine with glow-plugs?

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What is the minimum cranking speed for a C.I engine with glow-plugs?

(a) 150-180rpm

(b) 60 to 140rpm

(c) 60-90rpm

(d) 100-200rpm

I had been asked this question in an interview.

My question is taken from Starting Motor Switches and Control Circuit in division Starting System of Automotive Engine Design

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Right option is (b) 60 to 140rpm

For explanation I would say: The rotary engine it is 150-180rpm and for the C.I engine with glow plugs is 60-140rpm.Glow plugs are the engine heaters that are used to increase the engine temperature.

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