# Three Phase Induction Motor MCQ Questions Answers Electrical Engineering

## Three Phase Induction Motor Electrical Engineering MCQ Questions Answers

1) The advantage of would rotor motor is that ……….

a) it is inexpensive

b) it requires less maintenance

c) external resistance can be inserted in the rotor circuit

d) none of the above

Option – c)

2)The full-load slip of a 3-phase induction motor ranges from ………

a) 10% to 20%

b) 20% to 30%

c) 2% to 5%

d) none of the above

Option – c)

3) In a 3-phase induction motor, the rotor speed is ……. The synchronous speed.

a) greater than

b) smaller than

c) equal to

d) none of the above

Option – b)

4) When the rotor of a 3-phase induction motor is blocked, the slip is ……..

a) zero

b) 0.5

c) 0.1

d) 1

Option – d)

5) 3-phase wound rotor motors are also called ……….motors.

a) synchronous

b) slip ring

c) series

d) commutator

Option – b)

6) The stator of a 3-phase induction motor produces ……… magnetic filed.

b) rotating

c) alternating

d) none of the above

Option – b)

7) If a 4-pole induction motor has a synchronous speed of 1500 r.p.m., then, supply frequency is ……..

a) 50 Hz

b) 25 Hz

c) 60 Hz

d) none of the above

Option – a)

8) The air-gap between stator and rotor of a 3-phase induction motor ranges from ……….

a) 2 cm to 4 cm

b) 0.4 mm to 4 mm

c) 1 cm to 2 cm

d) 4 cm to 6 cm

Option – b)

9) At no-load, the rotor core loss of a 3-phase induction motor is ………

a) large

b) small

c) practically zero

d) none of the above

Option – c)

10) In the slip of induction motor increases, then, current in the stator winding ……..

a) is increased

b) is decreased

c) remains unchanged

d) none of the above