Single phase induction motors Archives - Page 2 of 10 - MCQ and Quiz for Exams

11. Speed control of a universal motor is achieved by

Varying field flux with tapped field windings

Connecting rheostat in series

Applying variable voltage by means of silicon controlled rectifier

All of the above methods

Detailed SolutionSpeed control of a universal motor is achieved by

12. A single-phase induction motor is

inherently self-starting with high torque

inherently self-starting with low torque

inherently non-self-starting with low torque

inherently non-self-starting with high torque

Detailed SolutionA single-phase induction motor is

13. If the capacitor of a single-phase motor is short-circuited

the motor will not start

the motor will run

the motor will run in reverse direction

the motor will run in the same direction at reduced r.p.m.

Detailed SolutionIf the capacitor of a single-phase motor is short-circuited

14. If starting winding of a single-phase induction motor is left in the circuit, it will

run faster

spark at light loads

draw excessive current and overheat

run slower

Detailed SolutionIf starting winding of a single-phase induction motor is left in the circuit, it will

15. Which of the following motor will give relatively high starting torque ?

Capacitor start motor

Capacitor run motor

Split phase motor

Shaded pole motor

Detailed SolutionWhich of the following motor will give relatively high starting torque ?

16. Which of the following motors has highest starting torque ?

Repulsion motor

Shaped pole motor

Capacitor-start motor

Split-phase motor

Detailed SolutionWhich of the following motors has highest starting torque ?

17. The rotor developed by a single-phase motor at starting is

more than rated torque

rated torque

less than the rated torque

zero

Detailed SolutionThe rotor developed by a single-phase motor at starting is

18. Which of the following motor will have relatively higher power factor ?

Capacitor run motor

Shaded pole motor

Capacitor start motor

Split phase motor

Detailed SolutionWhich of the following motor will have relatively higher power factor ?

19. Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.

shunt motor

series motor

A. shunt motor B. series motor C. compound motor

separately excited motor

Detailed SolutionSpeed torque characteristic of a repulsion induction motor is similar to that of a D.C.

20. The direction of rotation of an hysteresis motor is determined by

interchanging the supply leads

position of shaded pole with respect to main pole

retentivity of the rotor material

none of these

Detailed SolutionThe direction of rotation of an hysteresis motor is determined by

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