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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V2
 f
 V

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid over heating.
All of these
 to avoid locking of the armature.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 66.3%
 57.7%
 50%
 33.3%

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of number of pole.
  Change of rotor resistance.
  Change of supply frequency.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 ohms.
 5.7 ohms.
 2.2 ohms.
 6 ohms.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Resistance split phase motor
 Capacitor split phase motor
All of these
 Capacitor run motor

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MORE MCQ ON Electrical Machines

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