# 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

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

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°

Explanation:

.

14.

The directive gain of an antenna is given by

 A. B. C. D.

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