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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 0 Hz
 50 Hz
 25 Hz

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage, load angle and excitation
 supply voltage and load angle
 excitation and load angle
 supply voltage and excitation

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

  unity.
 infinity.
 zero.
 two.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 hyperbola
 any of the above
 linearised

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 slip rings.
 none of above.
 solid connection.
 commutator.

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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?

 40W
 100W
 60W
 80W

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