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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 44 A.
 40 A.
 400 A.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 6% and -4%
None of these
 3.2% and -1.6%
 4.8% and -3.2%

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 950 rpm
 940 rpm
 1000 rpm
 975 rpm

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 less than that of second transformer.
 equal to that of second transformer.
 none of these.
  more than that of second transformer.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
 Shaded pole motor.
  Stepper motor.
 Hysteresis motor.

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 conducting material.
 insulating material.
 non-ferrous material.

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