Electronics and Communication Engineering - Electromagnetic Field Theory

11. 

A line of characteristic impedance z0 ohms, phase velocity VP = 2 x 108 m/sec and length l = 2 m is terminated by a load impedance zL Ohms. The reflection coefficients at the input end and load end are respectively for a frequency of 50 MHz will be

A. 1
B. - 1
C. -1
D. 2

Answer: Option A

Explanation:

ri .


12. 

When a particular mode is excited in a waveguide, these appears an extra electric components in the direction of propagation. The resulting mode is

A. Transverse electric
B. Transverse magnetic
C. Longitudinal
D. Transverse Electromagnetic

Answer: Option B

Explanation:

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13. 

An antenna has a gain of 44 dB. Assuming that the main beam of the antenna is circular in cross-section the beamwidth will be

A. 0.4456°
B. 1.4456°
C. 2.4456°
D. 3.4456°

Answer: Option C

Explanation:

.


14. 

The directive gain of an antenna is given by

A.
B.
C.
D.

Answer: Option C

Explanation:

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15. 

In cellphone communication base antennas are connected to other base antennas in

A. line of sight communication
B. ionospheric propagation
C. ground wave propagation
D. medium wave propagation

Answer: Option A

Explanation:

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