Related Questions

The e.m.f. generated by a shunt wound D.C. generator is E. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
A $$\frac{{\text{E}}}{2}$$
B 2E
C Slightly less than E
D E
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
In a differentially compounded D.C. motor, if shunt field suddenly opens
A The motor will first stop and then run in opposite direction as series motor
B The motor will work as series motor and run at slow speed in the same direction
C The motor will work as series motor and run at high speed in the same direction
D The motor will not work and come to stop
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
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
A shunt generator can self-excite
A Only if the resistance of the field circuit is less than critical value
B Only if the resistance of the field circuit is greater than critical value
C Irrespective of the value of the resistance in the field circuit
D None of the above
In a shunt generator the voltage build up is generally restricted by
A speed limitation
B armature heating
C insulation restrictions
D saturation of iron
The series field of a short-shunt D.C. generator is excited by
A external current
B armature current
C shunt current
D load current
The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
A Armature reaction
B Armature resistance drop
C Field weakening due to armature reaction and armature
D Commutation

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