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Electromagnetic Field Theory

Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

3 db
2.15 db
4.15 db
6 db

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Electromagnetic Field Theory
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

No change in the impedance value
An increase in the value of reactance
Decrease in the value of reactance
No change in the reactance value

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Electromagnetic Field Theory
Tropospheric scatter is used with frequencies in the

HF
VLF
UHF
VHF

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Electromagnetic Field Theory
Which of following is the unit of inductance?

  Ampere turns.
 Ohm.
  Milli- henry.
  Webers / m.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Transmission efficiency
Loss coefficient
None of these
Front to back ratio

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Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 12t3.
 12t.
 24t.
 4t3.

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