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Electrical Machines

Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
 5 / 6.
 6 / 7.
  4 / 5.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Both of above.
 Heavy sparking at the first stud of starting resistance steps.
 Heavy sparking at brushes.
 None of these.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 44 A.
 400 A.
 40 A.

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

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 get damaged.
 start automatically without trouble.
 develop very low starting torque.
 not start automatically.

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Electrical Machines
Rotating part of DC motor is known as

 Starter.
 Carbone brush.
 Pole.
 Armature.

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MORE MCQ ON Electrical Machines

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