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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 100 ohm.
 50 ohm.

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Electrical Machines
At slip s = 1 torque developed in machine is

  none.
  maximum torque.
  starting torque.
  electromagnetic torque.

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

  voltage.
  load.
  speed and voltage.
 speed.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/ 4Sa
 PZL/4Sa²
 PZL/4Sp²
 PZL/4S

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Electrical Machines
The shaft of induction motor should be

  hollow.
  stiff.
  any of these.
  flexible.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Both 1 and 2
 Eddy current losses
 Copper losses

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