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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P and Z.
  P.
  Z.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.9 lag
 0.2 lag
 0.2 lead

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 150Hz.
 100Hz.
 50Hz.
 200Hz.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.

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Electrical Machines
Hysteresis loss will depends on

 f²
 f1.6
 f³
 f

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1450.
 1440.
 1500.

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MORE MCQ ON Electrical Machines

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