1. Number of slip rings in squirrel cage motor is:
(A) Zero
(B) 3
(C) 2
(D) 4
2. Starting torque of squirrel cage induction motor is:
(A) Very high
(B) Low
(C) Zero
(D) High
3. Resistance of the stator of 3-phase motor should not be less than:
(A) 1000 Ohm
(B) 1 M Ohm
(C) 10k Ohm
(D) 2 M Ohm
4. A 3-phase wound motor does not run; its cause may be:
(A) Open circuit in field
(B) Loose bearing
(C) Low load
(D) None of these
5. Which of the following is a mechanical fault in 3-phase synchronous motor:
(A) Punctured the insulation
(B) Breaking the motor fan
(C) Burning slip rings
(D) Open circuit
6. Wound rotor motor can be run on:
(A) None of these
(B) D.C supply only
(C) Both A.C & D.C
(D) A.C supply only
7. Stator of 3-phase synchronous motor is too hot; possible causes:
(A) Overload
(B) Both a & b
(C) Low excitation
(D) None of these
8. If wrong connection for a given voltage, then motor will be:
(A) Overheated
(B) Noise on no load
(C) Both a & b
(D) None of these
9. Wound rotor motor runs at half speed; possible causes:
(A) Short circuit
(B) No load
(C) Open circuit in rotor connection
(D) Earth fault
10. Failure of bearing is:
(A) Mechanical fault
(B) Magnetic fault
(C) Earth fault
(D) Electrical fault