Q9. (a) Explain the term power factor (2)
(b) Explain why it is detrimental to have a low power factor. (2)
(c) Explain, with the aid of phasor diagrams, how a synchronous motor may be used to assist in power factor correction. (6)
Q9. Describe the construction and operation of EACH of the following:
(a) Synchronous motor (5) (b) Induction motor. (5)
Q11. (a) With reference to battery systems for emergency purposes, explain the precautions that must be taken with regard to personnel safety, storage and maintenance. (7)
(b) Explain how batteries are kept at the correct rate of charge. (3)
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