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Electrical Machines

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

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

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 80W
 60W
 40W
 100W

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Electrical Machines
Eddy current loss will depends on

 Thickness
 Frequency
 Flux density
All of these

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 leading.
  lagging.
 unity.
 zero.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 not possible
 230 V
 some what less than 230 V

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 70° to 85°
 0°

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