Related Questions

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
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
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
The speed of a DC 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 None of the above
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
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
A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased
A power factor as well as armature current will decrease
B power factor as well as armature current will increase
C power factor will increase but armature current will decrease
D power factor will decrease and armature current will increase
The speed of a D.C. shunt motor can be increased by
A Increasing the resistance in armature circuit
B Increasing the resistance in field circuit
C Reducing the resistance in the field circuit
D Reducing the resistance in the armature circuit
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will
A Become unstable
B Draw excessive armature current and may burn out
C Fall out of synchronism and come to stand still
D Run as induction motor
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 run at constant speed

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