Q1.a) Explain the meaning of the term power factor correction (4)
b) State advantages of power factor correction (4)
c) Explain, with the aid of a circuit diagram, how power factor correction can be effected in a three phase circuit using capacitors. (4)
d) Explain one method other than the use of capacitors by means of which power factor correction may be effected. (4)
Q2. 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)
Q3. a) Describe, with the aid of a sketch, an electronic soft starting system that may be used for large a.c. induction motors. (8)
b) Discuss the advantages and disadvantages of soft starting system. (8)
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