Hi readers, this is another post about multiple choice questions on dc generators checkout and comment if you have any doubts.
1) The basic requirement of a d.c armature winding is that it must be
A) a closed one
B) a lap winding
C) a wave winding
D) either (B) or (C)
Ans:A
2) The primary reason for making the coil span of a d.c armature winding equal to a pole pitch is to
A) obtain a coil span of 180 degree (electrical)
B) ensure the addition of emfs of consecutive turns
C) distribute the winding uniformly under different poles
D) obtain a full-pitch winding
Ans:B
3) The emf induced in a conductor rotating in a bipolar field is
A) dc
B) ac
C) dc and ac both
D) none of these
Ans:B
4) The teeth in the armature of a dc machine are sometimes skewed This is done to reduce
A) hysteresis loss
B) copper loss
C) eddy current loss
D) vibrations
Ans:D
5) To avoid formation of grooves in the commutator
A) the brushes of opposite polarity should track each other
B) the brushes of same polarity should track each other
C) brush position has no effect on the commutator grooving
Ans:A
6) Wave winding is composed of
A) any odd number of conductors
B) any even number of conductors
C) that even number which is exact multiple of poles ∓2
D) that even number which is exact multiple of poles
Ans:C
7) The commutator pitch for simplex lap winding is
A) −1
B) ᐩ1
C) ᐩ1 or −1
D) average pitch
Ans:C
8) The commutator pitch for simplex wave winding is equal to
A) ᐩ1 or −1
B) twice average pitch
C) average pitch
D) half average pitch
Ans:C
9) Aluminium is not used as winding wire in dc machine armature as
A) is costlier
B) is of low resistivity
C) is of low thermal conductivity
D) requires large winding space
Ans:D
10) In a dc machine armature winding, the number of commutator segments is equal to the number of armature
A) coils
B) coil sides
C) conductors
D) turns
Ans:A
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1) The basic requirement of a d.c armature winding is that it must be
A) a closed one
B) a lap winding
C) a wave winding
D) either (B) or (C)
Ans:A
2) The primary reason for making the coil span of a d.c armature winding equal to a pole pitch is to
A) obtain a coil span of 180 degree (electrical)
B) ensure the addition of emfs of consecutive turns
C) distribute the winding uniformly under different poles
D) obtain a full-pitch winding
Ans:B
3) The emf induced in a conductor rotating in a bipolar field is
A) dc
B) ac
C) dc and ac both
D) none of these
Ans:B
4) The teeth in the armature of a dc machine are sometimes skewed This is done to reduce
A) hysteresis loss
B) copper loss
C) eddy current loss
D) vibrations
Ans:D
5) To avoid formation of grooves in the commutator
A) the brushes of opposite polarity should track each other
B) the brushes of same polarity should track each other
C) brush position has no effect on the commutator grooving
Ans:A
6) Wave winding is composed of
A) any odd number of conductors
B) any even number of conductors
C) that even number which is exact multiple of poles ∓2
D) that even number which is exact multiple of poles
Ans:C
7) The commutator pitch for simplex lap winding is
A) −1
B) ᐩ1
C) ᐩ1 or −1
D) average pitch
Ans:C
8) The commutator pitch for simplex wave winding is equal to
A) ᐩ1 or −1
B) twice average pitch
C) average pitch
D) half average pitch
Ans:C
9) Aluminium is not used as winding wire in dc machine armature as
A) is costlier
B) is of low resistivity
C) is of low thermal conductivity
D) requires large winding space
Ans:D
10) In a dc machine armature winding, the number of commutator segments is equal to the number of armature
A) coils
B) coil sides
C) conductors
D) turns
Ans:A
if you like my post don't forget to share and subscribe to feed.
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