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
In a certain conservative mutual fund. 70 percent of the money is in vested in bonds , and of that portion , 40 percent is invested in highly rated corporate bonds . If at least $ 1.4 million in this what is the smallest possible total value for the mutual fund?
A $4 million
B $ 4.50 million
C $ 5 million
D $8 million
The demagnetizing component of armature reaction in a D.C. generator
A Reduces generator e.m.f.
B Increases armature speed
C Reduces interpoles flux density
D Results in sparking trouble
In a separately excited generator supplying rated load the armature reaction:
A Is always present
B Is always absent
C May be sometimes present
D None of the above
Armature reaction in a generator results in
A Demagnetization of leading pole tip and magnetization of trailing pole tip
B Demagnetization of trailing pole tip and magnetization of leading pole tip
C Demagnetizing the center of all poles
D Magnetizing the center of all poles
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator?
A Providing laminations in armature core
B Providing laminations in stator
C Using nonmagnetic material for frame
D Using material of low hysteresis coefficient for armature core material
In D.C. generators on no-load, the air gap flux distribution in space is
A Sinusoidal
B Triangular
C Pulsating
D Flat topped
The good power factor of an induction motor can be achieved if the average flux density in the air gap is
A Absent
B Small
C Large
D Infinity
The armature of D.C. generator is laminated to
A reduce the bulk
B provide the bulk
C insulate the core
D reduce eddy current loss
For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f.?
A Lap winding
B Wave winding
C Either of (A) and (B) above
D Depends on other features of design

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