Related Questions

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
As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately
A 40 percent
B 25 percent
C 10 percent
D 5 percent
The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?
A 39
B 78
C 117
D 156
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
The armature core of a D.C. generator is usually made of
A Silicon steel
B Copper
C Nonferrous material
D Cast-iron
The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is
A 2
B 4
C 6
D 8
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
A separately excited generator as compared to a self-excited generator
A Is amenable to better voltage control
B Is more stable
C Has exciting current independent of load current
D Has all above features

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