21) If a 3-phase motor runs with two phases only, it is called single phasing. It will ultimately :
Answer is:
Burn out
Related Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers
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:
the motor takes 5 to 7 times of its full load current which will spoil the starter
Answer is: