ECE · all questions

Microwave Communication
practice.

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179

Questions

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Q161

Which one of the following can be used for amplification of microwave signals?

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Q162

A cavity is a

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Q163

The modes in a rectangular waveguide are denoted by TE_mn/ TM_mn where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide respectively.
Which one of the following statements is TRUE?

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Q164

Probe coupling is

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Q165

When a particular mode is excited in a wave guide, there appears an extra electric component in the direction of propagation. The resulting mode is

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Q166

HEMT used in microwave circuit is a

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Q167

Typical power gain of TWT amplifier is

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Q168

Which of the following is not a TWT slow wave structure

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Q169

Baretters and Bolometers are used to measure

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Q170

The TWT is sometimes preferred to the magnetron as a radar transmitter output tube because it is

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Q171

The diode which is mainly used in harmonic generator circuits as frequency multiplier is

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Q172

Indicate the false statement
Transient time in microwave tubes will be reduced if

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Q173

For TE or TM modes of propagation in bounded media, the phase velocity

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Q174

In a particular microwave tube an electron beam is traveling with an electromagnetic wave. The arrangement is such that beam of electrons gets accelerated. During this process

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Q175

Blackbody radiation is enclosed inside a spherical cavity of radius r at a temperature T. What would be the temperature of the enclosure if the radius expands to 2r adiabatically?

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Q176

Which vacuum based device is widely used as a power amplifier in satellite communication system?

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Q177

A microwave junction is supposed to be matched if in the S-matrix

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Q178

Consider the following statements relating to the micro-strip lines
1. Modes in micro-strip lines are purely TEM
2. Micro-strip lines is also called open strip line
3. Radiation loss in micro-strip line can be reduced by using thin high dielectric materials
4. Conformal transformation technique is quite suitable for solving micro problems
Which of the statements given above are correct?

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Q179

A directional coupler with three or more holes is preferred to a two-hole coupler

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