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
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
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
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
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
A person goes from point N to P and comes back. His average speed for the whole journey is 60 km/hr. If his speed while going from N to P is 40 km/hr, then what will be the speed of the person (in km/hr) while coming back from P to N?
A 80
B 100
C 120
D 140
In case of D.C. shunt motors the speed is dependent on back e.m.f. only because
A Back e.m.f. is equal to armature drop
B Armature drop is negligible
C Flux is proportional to armature current
D Flux is practically constant in D.C. shunt motors

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