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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  voltage.
  speed and voltage.
 speed.

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Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.
All of these
 any unbalanced magnetic pull on the armature core.

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

 Silicon steel.
 Cast iron.
 Fibre.
 Mild steel.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  very small, say about 2 or 3 V.
  250 V.
 about 100 V.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  synchronous motor.
  transformer with secondary short circuited.
  capacitor start induction motor.
  repulsion start induction motor.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 50Ω
 10Ω
 200Ω
 100Ω

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