Q3. With reference to the diesel engine cooling system:
(a) Explain why cooling is necessary (4)
(b) State the purpose of EACH of the following:
(i) Jacket water heater (4)
(ii) Jacket water drain tank (4)
(iii) Header tank (4)
Q5. State FOUR tests which are required for boiler water, giving a reason for EACH test. (16)
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