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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 3
46.
Cassergain feed is used with a parabolic reflector to
increase the gain of the system
increase the beamwidth of the system
reduce the size of the main reflector
allow the feed to be placed at a convenient point
Answer: Option
Explanation:

Cassergain is a type of feed, which is used to allow parabolic reflector to provide feed at a convenient point.

47.
Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure.

The value of load resistance is
50 Ω
200 Ω
12.5 Ω
0 Ω
Answer: Option
Explanation:

Vmax = 4, Vmin = 1,

48.
For the same length of arrays, half power beam-width of binomial array
is equal to that of uniform arrays
is less than that of uniform array
is more than that of uniform array
is negligible as compared to that of uniform array
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
The effective electrical length of an antenna is __________ its physical length
greater than
equal to
less than
none of the above
Answer: Option
Explanation:

Physical length is geometrical length, Effective length is increased by method called loading.

50.
The direction in a Yagi Uda antenna is longer than the radiating element.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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