To ensure that only dominant TE10 mode propagates in a rectangular waveguide, th

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Question
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

Correct Answer

must be more than cutoff frequency of TE₁₀ mode and less than cutoff frequency of TE₂₀ mode

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2. Assertion (A): In TE mode for rectangular waveguide.
Reason (R): In TM mode for rectangular waveguide.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

3. In which of the following devices can the operation be visualised in terms of a series feedback loops?
Options
A. TWT
B. Reflex klystron
C. Klystron amplifier
D. Backward wave oscillator

5. In a high frequency coaxial line and the length of line characteristic impedance is a function of
Options
A. properties of insulating material only
B. inner and outer conductor radius only
C. both (a) and (b)
D. neither (a) nor (b)

8. 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

10. 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

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