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
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
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
A cumulatively compounded long shunt generator when operating as a motor would be
A Cumulatively compounded long shunt
B Differentially compounded long shunt
C Cumulatively compounded short shunt
D Differentially compounded short shunt
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
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 maximum number of steps in a flight should generally be restricted to
A 10
B 12
C 15
D No limit
If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is
A Square
B Rectangular
C Trapezoidal
D Triangular
Natural air cooling is generally restricted for transformers up to
A 1.5 MVA
B 5 MVA
C 15 MVA
D 50 MVA

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