Hi readers, this is new post on multiple choice questions on dc generator check out and comment if you have any doubts....
1) In a 4-pole, 35 slot d.c armature, 180 electrical-degree coil span will be obtained when coils occupy........slots.
A) 1 and 10
B) 1 and 9
C) 2 and 11
D) 3 and 12
Ans:B
2) The critical resistance of the dc generator is the resistance of
A) armature
B) field
C) load
D) brushes
Ans:B
3) The series field of a short shunt dc generator is excited by..............currents.
A) shunt
B) armature
C) load
D) external
Ans:C
4) In a dc generator, the generated emf is directly proportional to the
A) field current
B) pole flux
C) number of armature parallel paths
D) number of dummy coils
Ans:B
5) The sole purpose of a commutator in a dc generator is to
A) increase output voltage
B) reduce sparking at brushes
C) provide smoother output
D) convert the induced ac into dc
Ans:D
6) Lap winding is suitable for ..............current
A) high, low
B) low, high
C) low, low
D) high, high
Ans:A
7)For a 4-pole, 2-layer dc lap winding with 20 slots and one conductor per layer, the number of commutator bars is
A) 80
B) 20
C) 40
D) 160
Ans:B
8) A 4-pole, 12 slot lap wound dc armature has two coil sides/slot. Assuming single turn coils and progressive winding, the back pitch would be
A) 5
B) 7
C) 3
D)6
Ans:B
9) In a 12-pole triplex, lap-wound dc armature, each conductor can carry a current of 100 A. The rated current of this armature is..........ampere
A) 600
B) 1200
C) 2400
D) 3600
Ans:D
10) The commercial efficiency of a shunt generator is maximum when its variable loss equals ........loss
A) constant
B) stray
C) iron
D) friction and windage
Ans:A
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1) In a 4-pole, 35 slot d.c armature, 180 electrical-degree coil span will be obtained when coils occupy........slots.
A) 1 and 10
B) 1 and 9
C) 2 and 11
D) 3 and 12
Ans:B
2) The critical resistance of the dc generator is the resistance of
A) armature
B) field
C) load
D) brushes
Ans:B
3) The series field of a short shunt dc generator is excited by..............currents.
A) shunt
B) armature
C) load
D) external
Ans:C
4) In a dc generator, the generated emf is directly proportional to the
A) field current
B) pole flux
C) number of armature parallel paths
D) number of dummy coils
Ans:B
5) The sole purpose of a commutator in a dc generator is to
A) increase output voltage
B) reduce sparking at brushes
C) provide smoother output
D) convert the induced ac into dc
Ans:D
6) Lap winding is suitable for ..............current
A) high, low
B) low, high
C) low, low
D) high, high
Ans:A
7)For a 4-pole, 2-layer dc lap winding with 20 slots and one conductor per layer, the number of commutator bars is
A) 80
B) 20
C) 40
D) 160
Ans:B
8) A 4-pole, 12 slot lap wound dc armature has two coil sides/slot. Assuming single turn coils and progressive winding, the back pitch would be
A) 5
B) 7
C) 3
D)6
Ans:B
9) In a 12-pole triplex, lap-wound dc armature, each conductor can carry a current of 100 A. The rated current of this armature is..........ampere
A) 600
B) 1200
C) 2400
D) 3600
Ans:D
10) The commercial efficiency of a shunt generator is maximum when its variable loss equals ........loss
A) constant
B) stray
C) iron
D) friction and windage
Ans:A
if you like this post share it with your friends and subscribe to latest updates....
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