Q1. Describe, with the aid of a graph, EACH of the following types of ferrous material failure, stating ONE practical example of EACH:
1. creep; (5)
2. fatigue. (5)
Q3. (a) Explain how power is transmitted through main propulsion shafting. (3)
(b) State THREE operational factors that may induce high stress in shaft coupling bolts. (3)
(c) Sketch a hydraulic type of shaft coupling bolt. (4)
Q5. (a) Sketch the hydraulic circuit for a ram type steering gear that complies with the single failure concept and automatic isolation. (6)
(b) Describe how automatic isolation, for the hydraulic circuit sketched in part (a), is achieved within 45 seconds should leakage of system oil occur. (4)
Q6. With reference to refrigeration systems:
(a) explain why undercooling of the refrigerant at the condenser outlet is desirable; (3)
(b) describe, with the aid of a sketch, how a heat exchanger could be incorporated in the circuit to enhance undercooling; (5)
(c) explain the possible consequences of the refrigerant having a dryness fraction at the compressor suction. (2)
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