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
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
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
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
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
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 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
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
The field coils of D.C. generator are usually made of
A Mica
B Copper
C Cast iron
D Carbon
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

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