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Q10. Describe, with the aid of a block diagram, the operation of a load sensing electronic governor controller for an a.c. generator. (10)

Q10. With reference to braking of a.c induction motors

(a) Explain why braking may be required (2)

(b) Explain why electrical braking is preferable to mechanical braking (2)

(c) Explain the term plugging (2)

(d) Describe how dynamic braking is achieved (4)

Q11. With reference to electrical system protective devices, explain the purpose of EACH of the following;

(a) overcurrent protection (2)         (b) Short circuit protection (2)

(c) No-volt protection (2)               (d) Reverse power protection (2)

(e) Preferential tripping (2)