These are some multiple choice questions on dc generators which has scope to ask in competitive exams.
1) The principle of dynamically induced emf is utilised in
A) Transformer
B) choke
C) generator
D) thermocouple
Ans:C
2) The field coils of a dc generator are usually made of
A) Mica
B) Copper
C) Cast iron
D) Carbon
Ans:B
3) Armature of dc machine is made of
A) conducting material
B) insulating material
C) non-ferrous material
D) silicon steel
Ans:D
4) The commutation of a dc motor serves purpose of
A) changing ac to dc
B) converting dc into ac
C) reducing friction
D) avoiding arc at the brushes
Ans:A
5) In dc machine, the armature winding are placed on the rotor because of the necessity for
A) electromechanical energy conversion
B) generation of voltage
C) commutation
D) development of torque
Ans:C
6) In dc machine brushes are physically placed in the
A) polar axis and electrically connected to the coils lying in the interpolar axis
B) polar axis electrically connected to the coils lying in the polar axis
C) Interpolar axis and electrically connected to the coils lying in the polar axis
D) Interpolar axis and electrically connected to the coils lying in the interpolar axis
Ans:A
7) wave winding is employed in a dc machine of
A) high current and low voltage rating.
B) low current and high voltage rating.
C) high current and high voltage rating.
D) low current and low voltage rating.
Ans:B
8) A wave winding must go at least ........ around the armature before it closes back where it started
A) once
B) twice
C) thrice
D) four times
Ans:B
9) The dc armature winding in which coil sides are a pole pitch apart is called .......... winding.
A) multiplex
B) fractional-pitch
C) full-pitch
D) pole-pitch
Ans:C
10) For making coil span equal to a pole pitch in the armature winding of a dc generator, the back pitch of the winding must equal the number of
A) commutator bars per pole
B) winding elements
C) armature conductors per path
D) armature parallel paths
Ans:A
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1) The principle of dynamically induced emf is utilised in
A) Transformer
B) choke
C) generator
D) thermocouple
Ans:C
2) The field coils of a dc generator are usually made of
A) Mica
B) Copper
C) Cast iron
D) Carbon
Ans:B
3) Armature of dc machine is made of
A) conducting material
B) insulating material
C) non-ferrous material
D) silicon steel
Ans:D
4) The commutation of a dc motor serves purpose of
A) changing ac to dc
B) converting dc into ac
C) reducing friction
D) avoiding arc at the brushes
Ans:A
5) In dc machine, the armature winding are placed on the rotor because of the necessity for
A) electromechanical energy conversion
B) generation of voltage
C) commutation
D) development of torque
Ans:C
6) In dc machine brushes are physically placed in the
A) polar axis and electrically connected to the coils lying in the interpolar axis
B) polar axis electrically connected to the coils lying in the polar axis
C) Interpolar axis and electrically connected to the coils lying in the polar axis
D) Interpolar axis and electrically connected to the coils lying in the interpolar axis
Ans:A
7) wave winding is employed in a dc machine of
A) high current and low voltage rating.
B) low current and high voltage rating.
C) high current and high voltage rating.
D) low current and low voltage rating.
Ans:B
8) A wave winding must go at least ........ around the armature before it closes back where it started
A) once
B) twice
C) thrice
D) four times
Ans:B
9) The dc armature winding in which coil sides are a pole pitch apart is called .......... winding.
A) multiplex
B) fractional-pitch
C) full-pitch
D) pole-pitch
Ans:C
10) For making coil span equal to a pole pitch in the armature winding of a dc generator, the back pitch of the winding must equal the number of
A) commutator bars per pole
B) winding elements
C) armature conductors per path
D) armature parallel paths
Ans:A
Thanks for reading my post. share this post to your friends if you think this may help them...
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