arrow
arrow
arrow
Which of the following is NOT a self–starting motor?
Question

Which of the following is NOT a self–starting motor?

A.

Three–phase IM

B.

DC shunt motor

C.

DC series motor

D.

One–phase IM

Correct option is D


The one-phase induction motor (IM) is not a self-starting motor: 
Explanation: When a single-phase supply is connected to the stator winding of a single-phase induction motor, it produces a pulsating magnetic field. The rotor does not rotate due to inertia, so the motor is not self-starting. 
Starting: To make a single-phase induction motor self-starting, it is temporarily converted into a two-phase motor during starting. This is done by adding an extra winding to the stator, called a starting winding. The starting winding and the main winding are placed across the single-phase supply.

test-prime-package

Access ‘PGCIL’ Mock Tests with

  • 60000+ Mocks and Previous Year Papers
  • Unlimited Re-Attempts
  • Personalised Report Card
  • 500% Refund on Final Selection
  • Largest Community
students-icon
368k+ students have already unlocked exclusive benefits with Test Prime!
test-prime-package

Access ‘PGCIL’ Mock Tests with

  • 60000+ Mocks and Previous Year Papers
  • Unlimited Re-Attempts
  • Personalised Report Card
  • 500% Refund on Final Selection
  • Largest Community
students-icon
368k+ students have already unlocked exclusive benefits with Test Prime!
Our Plans
Monthsup-arrow