For the same H.P. rating and full load speed, following motor has poor starting torque_____________?

Related Mcqs:

1. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?

   A. 2.36%
   B. 4.76%
   C. 6.77%
   D. 8.84%

2. The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?

   A. decreasing the field current
   B. increasing the field current
   C. decreasing the armature current
   D. increasing the armature current

3. The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?

   A. reducing the field current
   B. decreasing the armature current
   C. increasing the armature current
   D. increasing the excitation current
   E. none of the above methods

4. The ratio of starting torque to full-load torque is least in case of____________?

   A. series motors
   B. shunt motors
   C. compound motors
   D. none of the above

5. Following motor is used where high starting torque and wide speed range control is required?

   A. Single phase capacitor start
   B. Induction motor
   C. Synchronous motor
   D. D.C. motor
   E. None of the above

6. Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?

   A. drum type controller is used
   B. three point starter is used
   C. four point starter is used
   D. all above can be used

7. If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens____________?

   A. this will make armature to take heavy current, possibly burning it
   B. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
   C. nothing will happen to motor
   D. motor will come to stop

8. No-load speed of which of the following motor will be highest ?

   A. Shunt motor
   B. Series motor
   C. Cumulative compound motor
   D. Differentiate compound motor

9. D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this______________?

   A. series motor
   B. shunt motor
   C. compound motor
   D. any of the above

10. As -the load is increased the speed of D.C. shunt motor will____________?

    A. reduce slightly
    B. increase slightly
    C. increase proportionately
    D. remains unchanged