The crawling in the induction motor is caused by____________?

Related Mcqs:

1. The ‘crawling” in an induction motor is caused by___________?

   A. high loads
   B. low voltage supply
   C. improper design of machine
   D. harmonics developed in the motor

2. The ‘cogging’ of an induction motor can be avoided by____________?

   A. proper ventilation
   B. using DOL starter
   C. auto-transformer starter
   D. having number of rotor slots more or less than the number of stator slots (not equal)

3. Slip ring motor is preferred over squirrel cage induction motor where___________?

   A. high starting torque is required
   B. load torque is heavy
   C. heavy pull out torque is required
   D. all of the above

4. The shaft of an induction motor is made of_____________?

   A. high speed steel
   B. stainless steel
   C. carbon steel
   D. cast iron

5. A double squirrel-cage induction motor has______________?

   A. two rotors moving in oppsite direction
   B. two parallel windings in stator
   C. two parallel windings in rotor
   D. two series windings in stator

6. An induction motor is__________?

   A. self-starting with zero torque
   B. self-starting with high torque
   C. self-starting with low torque
   D. non-self starting

7. A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?

   A. will continue running burning its one phase
   B. will continue running burning its two phase
   C. will stop and carry heavy current causing permanent damage to its winding
   D. will continue running without any harm to the winding

8. It is advisable to avoid line starting of induction motor and use starter because____________?

   A. it will run in reverse direction
   B. it will pick up very high speed and may go out of step
   C. motor takes five to seven times its full load current
   D. starting torque is very high

9. The shape of the torque/slip curve of induction motor is__________?

   A. parabola
   B. hyperbola
   C. rectangular parabola
   D. straigth line

10. In case of a double cage induction motor, the inner cage has__________?

    A. high inductance arid low resistance
    B. low inductance and high resistance
    C. low inductance and low resistance
    D. high inductance and high resistance