Q1. Differentiate between half and full wave rectification. State where half wave rectification may be used and the purpose for which it is not well adapted. Sketch a bridge connection by which full wave rectification may be obtained. (16)
Q2. a) i. Describe the characteristics of a D.C. motor. (4)
ii Explain the advantages of such a motor for deck machinery. (4)
B. Describe with the aid of a sketch a control system for the motor in (A). (8)
Q3. With reference to preferential tripping in a marine electrical distribution system. a) With the aid of a sketch, describe a typical arrangement to provide three stages of tripping an instantaneous protection against short circuit. (10) b) State why this protection is required. (6)
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