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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 1
21.
A (75 - j 40) W load is connected to a co-axial line of z0 = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting
a short circuit stub at the load
an inductance at the load
a short circuit stub at a specific distance from the load
a capacitance at a specific distance from the load
Answer: Option
Explanation:

ZL = 75 - J . 40, ZC = 75 W, f = 6 mHz

Given ZL is capacitive, so proper matching, load must be inductive.

22.
A plane wave is characterized by the wave is
linearly polarized
circularly polarized
elliptically polarized
unpolarized
Answer: Option
Explanation:

Because, magnitude is different (0.5, 1) and phase is 90°

23.
The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε0. The surface charge density on the conductor is ((ε0 = 10-9/36p)F/m)
0 c/m2
2 c/m2
1.8 x 10-11 c/m2
1.14 x 10-9 c/m2
Answer: Option
Explanation:

.

24.
A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.
3 x 108 m/sec
5 x 108 m/sec
1.5 x 108 m/sec
9 x 108 m/sec
Answer: Option
Explanation:

Vg . Vp = C2

where .

25.
A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is
increased by a factor of 9
increased by a factor of 3
unchanged
reduced by a factor of 1/3
Answer: Option
Explanation:

.

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