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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is multiband HF receiving antenna?

Conical horn
Square loop
Folded dipole
Log-periodic

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Electromagnetic Field Theory
Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of K = 0.8. The turns ratio N1/N2 is

 1.
 4.
 2.
 0.5.

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Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 1666.22 N.
 3332.47 N.
 832.29 N.
 6664.8 N.

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 113.04 mH.
 37.68 µH.
 37.68 mH.
 113.04 µH.

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Electromagnetic Field Theory
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

The weight of the conductor
The direction of the conductor
None of these
The value of current

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

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