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)
Q10. a) Sketch a cross section through an A.C. induction motor. (5)
b) Describe the construction of the A.C. induction motor sketched in part (a). (5)
Q10. With reference to overload protection for electric motors, describe the principle of operation of EACH of the following types of overload relay
(a) Thermal (3)
(b) Magnetic (3)
(C) Electronic (4)
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