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Electromagnetic Field Theory

Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 short time rating.
 overload capacity.
 cooling.
 rating.

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Electromagnetic Field Theory
In above problem, if the inductance L1 and L2 in series aiding with 30 mH mutual inductance, then total inductance will be

 200 mH.
 150 mH.
 50 mH.
 100 mH.

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Electromagnetic Field Theory
The operation of electric generators and motors depend on the intraction between magnetic field and

 Electric fields.
 Copper conductors.
 Commutator.
  Electric current.

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Electromagnetic Field Theory
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position

 5 × 10-5 uy N.
  - 5 × 10-5 uy N.
 5 × 10-5 ux N.
 5 × 10-5 uz N.

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Electromagnetic Field Theory
A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

 the inductor is non linear.
 the above statement is false.
 the inductor is made of thin wire.
 the inductor has ferrite core.

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Electromagnetic Field Theory
The field at any point on the axis of a current carrying coil will be

 zero.
 parallel to axis.
 perpendicular to the axis.
 at angle of 45° with the axis.

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MORE MCQ ON Electromagnetic Field Theory

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