In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?

Related Mcqs:

1. If I2 be the armature current, then speed of a D.C. shunt motor is_______________?

   A. independent of Ia
   B. proportional to la
   C. varies as (Ia)
   D. varies as la

2. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be_____________?

   A. level compounded
   B. under compounded
   C. cumulatively compounded
   D. differentially compounded

3. If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?

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

4. 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

5. The armature torque of the D.C. shunt motor is proportional to____________?

   A. field flux only
   B. armature current only
   C. both A. and B.
   D. none of the above

6. In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?

   A. 100%
   B. around 90%
   C. anywhere between 75% and 90%
   D. less than 50%

7. In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

   A. 100% of the previous value
   B. 50% of the previous value
   C. 25% of the previous value
   D. 10% of the previous value
   E. none of the above

8. The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________?

   A. 4.0
   B. 2.0
   C. 1.0
   D. 0.5

9. If the field of a D.C. shunt motor gets opened while motor is running______________?

   A. the speed of motor will be reduced %
   B. the armature current will reduce
   C. the motor will attain dangerously high speed 1
   D. the motor will continue to nuvat constant speed

10. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?

    A. increase
    B. decrease
    C. remain same
    D. become zero