Hollow waveguides are used as transmission lines at frequencies above 1 GHz abov

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Question
Hollow waveguides are used as transmission lines at frequencies
Options
A. above 1 GHz
B. above 5 GHz
C. above 10 MHz
D. above 1 MHz

Correct Answer

above 5 GHz

Microwave Communication problems

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1. The following components are used to measure power output of a 2 kW TWT amplifier
1. TWT
2. Low pass/High pass filter
3. Low power 20 dB attenuator
4. 40 dB directional coupler with matched load
5. Power meter.
The correct sequence of connections of these components is:
Options
A. 1, 4, 2, 3, 5
B. 1, 3, 4, 2, 5
C. 1, 2, 4, 3, 5
D. 1, 4, 3, 2, 5

4. To ensure that only dominant TE₁₀ mode propagates in a rectangular waveguide, the operating frequency
Options
A. must be more than cutoff frequency of TE₁₀ mode
B. must be less than cutoff frequency of TE₂₀ mode
C. must be more than cutoff frequency of TE₁₀ mode and less than cutoff frequency of TE₂₀ mode
D. must be less than cutoff frequency of TE₁₀ mode

6. A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present
Options
A. an infinite impedance in shunt with line
B. an infinite impedance in series with line
C. a zero impedance in shunt with line
D. a finite impedance in shunt with line

10. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have
Options
A. reduced losses
B. high bandwidth
C. reduced losses and low bandwidth
D. more losses and low bandwidth

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