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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 1
 finite value
 infinite value
 0

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 10 volts.
 20 volts.
 40 volts.
 30 volts.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 Remain unchanged
 Increases.
 None of above.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 2
 0 < S < 1
 -1 < S < 1

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Electrical Machines
An induction motor is, in general analogous to

 auto transformer.
None of these
 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.

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