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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
6 db
4.15 db
2.15 db

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Electromagnetic Field Theory
Which of the following will increase the antenna radiation efficiency?

Providing insulation on conductor
Use of larger section of conductor
Any of the above
Top loading of antenna

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Electromagnetic Field Theory
If the resistance of a conductor does not vary in accordance with the Ohms law it is known as

 non - conductor.
 non - linear conductor.
 reverse conductor.
 bad conductor.

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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

 24 mH.
 12 mH.
 3 mH.
 48 mH.

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Electromagnetic Field Theory
For a line characteristic impedance zo terminated is load zo/3, the reflection coefficient is

 – 1/3.
  – ½.
 1/3.
 2/3.

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Electromagnetic Field Theory
The ability of charged bodies to exert force on one another is attributed to the existence of

 protons.
 electric field.
 neutrons.
 electrons.

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MORE MCQ ON Electromagnetic Field Theory

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