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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Shunt.
  None of them.
  Compound.
  Series.

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Electrical Machines
The type of DC motor used for shears and punches is

  Cummulative compound motor.
 Shunt motor.
 Differential compound motor.
 Series motor.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 S
 2-S
 1-S
 1/S

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  along field axis.
  in none of above positions.
  along neutral axis.
  in any of above positions.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.
  P = 40, s = 5.79 %.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 R1 /K²
 K×R1
 K²R1

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