Q9. (a) Describe, with the aid of a sketch, a static excitation system for a generator.(8)
(b) Explain TWO advantages of static excitation.(2)
Q10. Describe how the starting torque of electric induction motors may be improved by using EACH of the following:
(a) wound rotor; (5) (b) double cage. (5)
Q5. With reference to the protection of electrical equipment in a distribution system:
(a) state the aims of the protective devices; (3)
(b) list the parameters that are monitored and acted upon by the protective devices; (4)
(c) state, with reasons, THREE causes of electrical fires. (3)
Q11. With reference to electrical equipment in potentially flammable atmosphere:
(a) Explain why conventional equipment is considered hazardous (2)
(b) Explain the concept of intrinsic safety (3)
(c) Describe, with the aid of a sketch, a safety barrier for an electrical power supply (5)
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