Q9. (a) Describe, with the aid of a sketch, the constructional details of a squirrel cage rotor as fitted in an induction motor (7)
(b) Explain why some rotors have a double cage. (3)
Q11. With reference to large electrical transformers on board ships:
(a) state where these transformers may be used; (1)
(b) state a typical efficiency range for a transformer; (1)
(c) state the regulations pertaining to transformers; (3)
(d) state the protective devices that are fitted; (2)
(e) describe the maintenance requirements. (3)
Q11. (a) Explain the principle of operation of an insulation resistance test, stating why the test is carried out on a regular basis. (6)
(b) Describe how EACH of the following electrical tests is carried out:
(i) resistance; (2)
(ii) continuity. (2)
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