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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 2.5Hz
 50Hz

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

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

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced iron loss.
 Reduced copper loss.
  Decrease in weight/KVA.
 Increase in weight/KVA.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 570 A.
 250 A.
 340 A.

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Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
All of these
 magnetization
 demagnetization

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Electrical Machines
A DC generator beyond critical resistance will generate

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

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