Related Mcqs:

1. It is advisable to avoid line-starting of induction motor and use starter because__________?

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

2. 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

3. In a star-delta starter of an induction motor___________?

   A. resistance is inserted in the stator
   B. reduced voltage is applied to the stator
   C. resistance is inserted in the rotor
   D. applied voltage perl stator phase is 57.7% of the line voltage

4. Low voltage at motor terminals is due to____________?

   A. inadequate motor wiring
   B. poorely regulated power supply
   C. any one of the above
   D. none of the above

5. A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will____________?

   A. stall after sometime
   B. stall immediately
   C. continue to run at lower speed without damage
   D. get heated and subsequently get damaged

6. A change of 4% of supply voltage to an induction motor will produce a change of approximately ________?

   A. 4% in the rotor torque
   B. 8% in the rotor torque
   C. 12% in the rotor torque
   D. 16% in the rotor torque

7. The good power factor of an induction motor can be achieved if the average flux density in the air gap is___________?

   A. absent
   B. small
   C. large
   D. infinity

8. 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

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

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

10. The rotor of an induction motor runs at__________?

    A. synchronous speed
    B. below synchronous speed
    C. above synchronous speed
    D. any of the above