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Electrical Machines
What are slot wedges in a DC machine made of?
Mild steel.
Cast iron.
Silicon steel.
Fibre.
Mild steel.
Cast iron.
Silicon steel.
Fibre.
Answer
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Related Question
Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is
40 A.
440 A.
44 A.
400 A.
40 A.
440 A.
44 A.
400 A.
Answer
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Electrical Machines
Which of the following represents the commutator pitch?
Number of conductors spanned by one coil at the front end of the armature.
Number of conductors spanned by one coil at the back end of the armature.
Number of commutator segments between two successive coils.
The distance between the staring of first coil and its next successive coil
Number of conductors spanned by one coil at the front end of the armature.
Number of conductors spanned by one coil at the back end of the armature.
Number of commutator segments between two successive coils.
The distance between the staring of first coil and its next successive coil
Answer
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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is
1 and 3
2 and 3
1 alone
1 and 2
1 and 3
2 and 3
1 alone
1 and 2
Answer
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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where
less costly motor is not required.
low starting torque.
power factor is less.
high starting torque.
less costly motor is not required.
low starting torque.
power factor is less.
high starting torque.
Answer
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Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be
Xd = 10.8Ω and Xq = 8Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 9Ω and Xq = 9.6Ω
Xd = 10.8Ω and Xq = 8Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 9Ω and Xq = 9.6Ω
Answer
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