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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  0.54.
  1.

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and low reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Unity power factor.
 Lagging power factor.
 Zero power factor.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 both eddy current and hysteresis loss.
 ohmic loss.
 eddy current loss.
  hysteresis loss.

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous motor
 3-phase synchronous generator
 hysteresis motor

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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/4S
 PZL/4Sp²

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