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Electromagnetic Field Theory

Electromagnetic Field Theory
An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 O. The standing wave ratio will be

2.5
4.5
1.5
3.5

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Electromagnetic Field Theory
How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

 1mA.
 2.5 mA.
 2 mA.
 1.5 mA.

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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.
 113.04 µH.
 37.68 mH.

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Electromagnetic Field Theory
A waveguide operated below cut off frequency can be used as

An isolator
Phase shifter
None
An attenuator

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

 short time rating.
 overload capacity.
 rating.
 cooling.

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Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = b/4
a = b
a = 3b
a = 2b

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