Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

A 10 GHz signal propagates in a waveguide with a phase velocity of 4 x 108 m/s. If the signal produces standing wave in the guide, then the distance between successive minimal will be
A:
10 mm
B:
20 mm
C:
30 mm
D:
40 mm
Answer: B

f = 10 GHz, v = 4 x 108 m/sec,

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Two identical and parallel dipole antenna are kept apart by a distance of λ/4 in the H-plane. They are fed with equal currents but the right most antenna has a phase shift of + 90°. The radiation pattern is given as
A:
B:
C:
D:
Answer: A

There will be no pattern in E-plane, only in H-Plane.

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An antenna having an effective temperature of 27°K is fed into a microwave amplifier that has an effective noise temperature of 30 K. Calculate the available noise power per unit bandwidth
A:
30 K
B:
57 K
C:
27 K
D:
3K, K is Boltzmann constant
Answer: B

where K is Boltzmann constant.

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If wave of critical frequency 30 MHz is departing at an angle of 60°, then the MUF is given to be
A:
10 MHz
B:
15 MHz
C:
30 MHz
D:
60 MHz
Answer: D

MUF = fc sec θ

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For static magnetic field Maxwell's curl equation is given by
A:
∇ . = μ0
B:
∇ x = 0
C:
∇ x = μ0
D:
∇ x = μ0/
Answer: C

For static field, time varying factor will be zero, ∇ x H

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