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Q7: A. Describe the events leading to a crankcase explosion B. How is overheating indicated other than by a mist detector C. How is severity of a crankcase explosion controlled D. Discuss the action required when overheating is indicated.

Q6. With reference to the circuit breaker for an a.c. generator A. Describe the preventive maintenance carried out on the circuit breaker for an A.C Generator. B. Explain the sequence of events that might occur if the breaker opens on a short circuit and state the check you would require following such event. C. Give a safe procedure to follow should a main circuit breaker fail to open under fault condition.

Q6. A. Describe the events leading to a crankcase explosion.

B. State how overheating might be indicated other than by a mist detector.

C. Discuss the procedure to follow in the invent of overheating being indicated.

D. State how severity of a crankcase explosion is limited.

Q1: Describe how the following conditions are prevented in auxiliary boilers:

A. Feed contamination by oil from heating coil drains.

B. Internal corrosion.

C. Furnace blowback.

D. Uptake fire.