Q1. (a) Draw circuit diagram and explain working of Star – Delta starter. (8)
(b) Explain with diagram how direction of single phase induction motor is reversed. (8)
Q4. With reference to a three-phase shipboard electrical distribution system:
a) Enumerate the advantages of an insulted neutral system. (4)
b) Enumerate the disadvantages of an insulted neutral system. (4)
c) Describe how the Earthed neutral system is earthed. (4)
d) Compare the use of an insulated neutral system as opposed to the use of an Earthed neutral system with regard to the risk of electric shock from either system. (4)
Q1.a) Explain three methods of overcurrent protection for electrical circuit. (8)
b) Explain with aid of diagram, the meaning of the term inverse current time characteristic (8)
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