ECE · all questions

Microwave Communication
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Q141

Transferred electron bulk effect occurs in which of the following?

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Q142

A 20 B directional coupler is shown in the figure
The power output at port 3 will be
Microwave Communication mcq question image

Microwave Communication mcq question image

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Q143

The cutoff wavelength in a standard rectangular waveguide for the TE₁₁ mode is:

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Q144

X-band frequencies are in which one of the following ranges?

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Q145

Which of the following is not a negative resistance device?

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Q146

An ideal local oscillator for microwave frequency measurements, The most suitable microwave source is a

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Q147

Evanescent mode attenuation in a waveguide depends upon the

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Q148

A parametric amplifier has to be cooled

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Q149

In order to couple two generators to a wave guide system without coupling them to each other one, one could not use a

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Q150

Consider the following statements:
For a square waveguide of cross section 3 cm × 3 cm it has been found
1. At 6 GHz dominant mode will propagate
2. At 4 GHz all the modes are evanescent
3. At 11 GHz only dominant modes and no higher order mode will propagate
4. At 7 GHz degenerate modes will propagate
Which of the above statements are correct?

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Q151

The frequency range of K band for the radar system is

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Q152

For a WR 90 waveguide, the cut-off frequency for TE₂₀ mode is 16 GHz. Then the cut-off frequency for TE₁₁ mode will be

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Q153

A turnstile junction is a

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Q154

Consider a rectangular waveguide of internal dimension 8 cm × 4 cm Assuming an TE₁₀ mode of propagation, the critical wavelength would be

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Q155

Typical material thickness in micro-strip is

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Q156

Which of the following statement is correct in the directional coupler?

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Q157

Gunn diode can replace reflex klystron in
1. Signal Generators
2. Frequency modulated power oscillators
3. Parametric amplifier pumps

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Q158

At microwave frequencies, varactor diode is not useful

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Q159

A reflex klystron oscillator uses

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Q160

A reflex klystron is capable of operating at such high frequencies as

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