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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
 DC machine
 Synchronous machine
All of these

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.06 Ω.
  0.54 Ω.
 0.54 Ω.
 0.01 Ω.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 68%
 60%
 38%
 40%

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 18°
 72°
 30°

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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

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

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the speed of the motor.
  It starts the motor.
  it limits the starting current to a safe value.
None of these

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