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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Hysteresis loss
 Magnetic loss
 Copper loss

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.62.
 1.24.
 0.25.
 0.72.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 4 and 2
 2 and 1
 4 ang 1

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Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 triangular wave.
 sine wave.
 square wave.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 0 < S < 2
 -1 < S < 1
 -2 < S < 2

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.96
 0.95
 1.06
 0.87

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