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EK-Motor : 2015/MAR/08 – 2016/DEC/08 – 2017/JUL/06 – 2017/OCT/08 – 2019/JUL/06 – 2020/JUL/08

Question

Q6. With reference to two stroke, slow speed engines:

Explain what is meant by the term thermal stress and how this can cause cracking of the crown surfaces; (4)

Sketch a cross section of a piston, labelling the MAIN components and indicating coolant flow; (8)

State a cause of EACH of the following defects:

(i) Burning of the crown upper surfaces; (2) (ii) Carbon deposits in the cooling spaces. (2)

Asked in Year/Month/Ques No.

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