19) A 3-phase, 400 V, 50 Hz induction motor has a rated speed of 715 r.p.m. How many poles are there in the machine ?
Answer is:
8
Related Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers
Answer is:
high starting current, high starting P.F.
Answer is:
Burn out
22) On switching 'ON' the starter, the magnetic contractor vibrates heavily. The possible cause is :
Answer is:
low voltage and dirt between the contacts
Answer is: