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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Running Torque.
 Starting torque.
  Effiency.
 Speed regulation.

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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.

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

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Electrical Machines
For larger units high torque it is preferred to use

 Partial motor.
 Universal motor.
 DC shunt motor.
 Slip induction motor.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Mild steel.
 Fibre.
 Cast iron.
 Silicon steel.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cos2δ
 sin2δ
 cosδ

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

  3.33 %.
 0 .001 %.
 3 %.
None of these

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