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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 95%
 92%
 94%

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Any where between 75 % and 90 %.
 Around 90 %
 Less than 50 %
 Around 100 %.

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4S
 PZL/4Sp²
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 660
 60
 600

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a high reluctance motor.
 It is a variable speed motor.
 It is a step angled motor.
  It is a constant speed motor.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 400W
 500 W
 250 W
 300 W

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