Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly
A:
0.13 W
B:
0.88 W
C:
7.3 W
D:
73 W
Answer: D

P = I2 . R (1)2 . 73 73 watt.

Here, vertical wire will be considered as dipole.

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A TV. transmitting aerial is fixed on top of a 150 metre tower located on a mountain 1200 m height. The range of transmitter is
A:
51 km
B:
152 km
C:
152 m
D:
51 m
Answer: B

1 = 1.44[ht + ht]

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The distance between maxima and minima of a standing wave is
A:
λ/4
B:
λ/2
C:
λ
D:
2λ
Answer: A

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Maximum effective aperture of an antenna which is operating at a wavelength of 3 meters and has a directivity of 100
A:
71.68 m2
B:
716 m2
C:
7.16 m2
D:
71.6 m2
Answer: D

.

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A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The transmission coefficient will be
A:
1.70 - j 2.97
B:
0.08 + j 0.32
C:
1.32 + j 1.38
D:
1.08 + j 0.32
Answer: D

Transmission coefficient .

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