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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 no voltage.
 maximum current.
 maximum power.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  zig - zag connection.
  delta connection.
  star connection.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 generator field terminal.
 motor field terminal.
 generator armature terminal.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 none of these.
 less than that of second transformer.
  more than that of second transformer.

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

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

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
  8.
 4.
  2.

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