Microwaves are used for telephony radio broadcast TV systems all of the above

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all of the above

Microwave Communication problems

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1. At a frequency equal to cutoff frequency in a rectangular wave guide
Options
A. the flow of electromagnetic energy is zero
B. the flow of electromagnetic energy is infinite
C. the flow of electromagnetic energy is 50% of maximum
D. the flow of electromagnetic energy is 10% of maximum

2. A directional coupler is used
Options
A. to transmit microwave signals
B. to generate microwave signals
C. to measure amplitude and phase of a travelling wave
D. both (a) and (b)

3. Consider the following statements about a magic tee
1. The collinear arms are isolated from each other.
2. On of the collinear arms is isolated from E arm.
3. On of the collinear arms is isolated from H arm.
4. E and H arms are isolated from each other.
Of the above statements
Options
A. 1 and 2 are correct
B. 1 and 3 are correct
C. 1 and 4 are correct
D. 2 and 3 are correct

4. As compared to LED, LASER has
1. higher emission efficiency
2. no tuning arrangement
3. narrow spectral width
4. provision for confinement
Of these statements
Options
A. 1, 2, 3 are correct
B. 1, 2, 4 are correct
C. 1 and 3 are correct
D. 1, 3, 4 are correct

5. A TEM wave is incident normally on a perfect conductor. The E and H fields at boundary will respectively be
Options
A. minimum and maximum
B. minimum and minimum
C. maximum and minimum
D. maximum and maximum

10. In a klystron amplifier the transit time of electron passing the gap in the cavity should be
Options
A. less than one cycle
B. less than half cycle
C. less than quarter cycle
D. more than quarter cycle

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