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Engine cranking is difficult in which temperatures?

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Engine cranking is difficult in which temperatures?

(a) Moderate

(b) Hot

(c) Humid

(d) Cold

The question was posed to me by my school principal while I was bunking the class.

My question is taken from Engine Starting Methods in chapter Diesel Engine Plant of Energy Engineering

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Right answer is (d) Cold

The best I can explain: The engine cranking is difficult in colder temperatures especially if engine is directly driving other machine equipments such as torque converter or hydraulic pumps. Cold engine oil adds to the load on starter, and this load may increase by 3 to 4 times what it would normally be in warmer weather.

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