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101.

What are the names of the windings used in the split phase starting?(a) starting windings(b) auxiliary windings(c) starting or auxiliary windings(d) starting and auxiliary windingsI had been asked this question by my college professor while I was bunking the class.My enquiry is from Types of Motor in portion Design of Single Phase Induction Motor of Design of Electrical Machines

Answer»

Correct choice is (c) starting or auxiliary windings

To explain I WOULD say: The single phase induction motor is not self starting. The starting or auxiliary windings are USED along with the RUNNING or main windings.
Discussion
102.

What is the displacement of the running and the starting windings used?(a) running winding displaces the starting winding by 180°(b) running winding displaces the starting winding by 90°(c) starting winding displaces the running winding by 90°(d) starting winding displaces the running winding by 180°The question was asked in a job interview.My question is taken from Types of Motor topic in portion Design of Single Phase Induction Motor of Design of Electrical Machines

Answer»

The correct option is (b) running winding displaces the starting winding by 90°

Best explanation: The SPLIT PHASE starting MAKES use of the starting windings along with the running windings. The running winding displaces the starting windings by 900.
Discussion
103.

How many methods are present in the self starting of the single phase induction motor?(a) 1(b) 2(c) 3(d) 4I got this question in an international level competition.The query is from Types of Motor in chapter Design of Single Phase Induction Motor of Design of Electrical Machines

Answer» RIGHT choice is (c) 3

The best explanation: There are 3 METHODS involved in the self STARTING of the single phase induction motor. They are split phase starting, SHADED pole starting, repulsion motor starting.
Discussion
104.

What is the special feature of single phase induction motor?(a) high starting torque(b) low starting torque(c) average starting torque(d) zero starting torqueI have been asked this question during an interview.Question is from Types of Motor in section Design of Single Phase Induction Motor of Design of Electrical Machines

Answer»

Right option is (d) zero STARTING torque

Easy explanation: The SINGLE phase induction motor has no INHERENT starting torque. Thus special means should be used to MAKE it SELF starting.
Discussion