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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
 food processing
 computer printers
All of these

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 2500 W
 1600 W and 5000 W
 3200 W and 5200 W
 1600 W and 1250 W

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 development of torque.
 generation of voltage.
 commutation.
 electromechanical energy conversion.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 250 A.
 340 A.
 440 A.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 205 V.
  201.02 V.
 212 V.
 210 V.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 4
 2
 1

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