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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 V²
 f²
 f

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 340 A.
 250 A.
 440 A.
 570 A.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N12 : N22.
 N1 : N2.
 none.
 1 : 1.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 3 - Φ induction motor.
 Stepper motor.
  1 - Φ synchronous motor.
 DC motor.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 2400 A.
 1200 A.
  3600 A.
 600 A.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 pole chamfering
All of these
 pole stacking
 compensating winding

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