Q8. For a fully automatic provisions refrigeration system incorporating a number of rooms; A. Explain how each room temperature is set; B. Describe the sequence of events following a demand for increased refrigerant flow from one room; C. State with reasons the devices incorporated into the system to protect the machinery and equipment against malfunction; D. State how satisfactory operation of the plant can be established?
Q4. An auxiliary engine exhibits a tendency to hunt to such an extent that the engine speed variation prohibits the connection of the machine to the switchboard. A. Discuss the possible causes of hunting; B. Explain how the problem of hunting can be rectified.
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.
Q4. Discuss the advantages and disadvantages of adopting the following policies for maintenance of main and auxiliary diesel engines. A. Planned maintenance; B. Condition monitoring; C. Periodic replacement of components. D. Break down maintenance
Q4. With reference to Auxiliary boiler safety valves;
A. Describe with the aid of Sketch the safety valve for an auxiliary boiler;
B. Identify with reasons. The parts that require particularly close attention during overhaul;
C. Describe how the safety valves are reset after an overhaul.
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