1. . Current is induced in the rotor of three-phase induction motor by _______
(A) AC supply
(B) DC supply
(C) All of above
(D) Induction effect
2. . The ________ supply is used in induction motor.
(A) DC
(B) None
(C) Both
(D) AC
3. . The two prominent parts of induction motor are ________ and ________
(A) Stator, rotor
(B) Slip ring, bearing
(C) Core, end housing
(D) Shaft, stator
4. . Frame of induction motor is made of _________
(A) Wrought iron
(B) Cast steel
(C) Silicon
(D) Cast iron
5. . Supply is provided to ________ in order to start an induction motor.
(A) Rotor
(B) Field
(C) a & b
(D) Stator
6. . There are generally ________ slip rings on squirrel cage induction motor.
(A) Two
(B) Three
(C) None
(D) Four
7. . _________ is placed at rotor of wound rotor induction motor.
(A) Single-phase winding
(B) None of above
(C) Both (a) & (b)
(D) Three-phase winding
8. . The three-phase wound rotor induction motor has ________ slip rings.
(A) Two
(B) Eight
(C) Four
(D) Three
9. . The direction of rotation of three-phase motor can be reversed by ________
(A) By changing the two supply wires
(B) By changing all the supply wires
(C) (a) and (b)
(D) Any of above
10. . If the two phases are interchanged of a three-phase motor then the motor ________
(A) Keeps on running in same direction
(B) Will be reversed
(C) Stopped
(D) Draws excessive current
11. . At starting the motor draws ________ times current of its full load.
(A) Two
(B) Three
(C) Five
(D) Up to 7
12. . If line voltage is 400 V then the phase voltage will be _________
(A) 230 V
(B) 210 V
(C) 220 V
(D) 200 V
13. . In ________ method, the motor draws more current.
(A) All
(B) Auto transformer
(C) Star-Delta
(D) D.O.L
14. . The speed will ________ by reducing the supply frequency.
(A) Decreased
(B) Increased
(C) No change
(D) All
15. . By increasing the stator poles of induction motor, the speed is ________
(A) No change
(B) Increased
(C) Decreased
(D) All