ECE · all questions

Electromagnetic Field Theory
practice.

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329

Questions

14/17

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Q261

Open question

For loss less transmission line L = 0.35 µH/m, C = 90 pF/m and frequency = 500 MHz. Then the magnitude of the propagation constant is

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Q262

Open question

The intrinsic impedance of free space is

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Q263

Open question

The magnitude of Coulomb's force of repulsion between two alpha particles (helium ions) in space 10 mm apart is:

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Q264

Open question

If a transmission line terminated with a load equal to be characteristic impedance the reflection co-efficient is

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Q265

Open question

The group delay function τ(ω) is related to phase function φ(ω) as

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Q266

Open question

Blue colour of sky look due to

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Q267

Open question

A vector

P

is given by

P = x^{3} y a_{x} - x^{2} y^{2} a_{y} - x^{2} y z a_{z}

Which of the following statements is TRUE?

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Q268

Open question

The intensity of radiation of a dipole depends strongly on frequency. If at a frequency f, the intensity of radiation is '

I

' then at a frequency of

\frac{f}{2}

, the intensity will be:

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Q269

Open question

A lossy transmission line has resistance per unit length-R = 0.01 Ω/m. The line is distortion less and has characteristic impedance of 100 Ω. The attenuation constant (in NP/m, correct to three decimal places) of the line is

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Q270

Open question

A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m. If the line is distortion less, the attenuation constant (in Np/m) is

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Q271

Open question

Divergence theorem is applicable for . . . . . . . .

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Q272

Open question

Divergence of D is a

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Q273

Open question

An axial magnetic field is applied to a cylindrical rod. The Faraday rotation of a plane polarized beam after emergence from the rod is 5°. If both the field and length of rod or doubled, then the angle of rotations is:

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Q274

Open question

The force between two parallel current carrying conductors placed at a x distance apart and carrying same current I is :