Electromagnetic Field Theory
A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is

 40 V.
 80 V.
 60 V.
 8 V.

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Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?

At frequencies below the cut off value the wave progresses across the waveguide after total reflections
At waveguide can be coupled to a coaxial cable
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
Waveguides can handle large power at UHF and microwaves

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Electromagnetic Field Theory
The effective reactance of an inductive coil

 none of these.
 increases because of stray capacitance as the frequency increases.
 decreases because of stray capacitance as the frequency increases.
 remains same irrespective of the frequency.

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