Microwave Communication MCQ Questions & Answers

71

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

A) Gunn diode B) Tunnel diode C) Step recovery diode D) Schottky diode

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Answer & Solution

Answer: Option D

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72

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

A) The electrodes are brought closer together B) A higher anode current is used C) Multiple or coaxial leads are used D) The anode voltage is made larger

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Answer & Solution

Answer: Option C

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73

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

A) Is independent of frequency B) Is a linear function of frequency C) Is a non-linear function of frequency D) Can be frequency-dependent or frequency independent depending on the source

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Answer & Solution

Answer: Option C

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74

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

A) Electron beam imparts energy to the EM wave B) EM wave gets attenuated C) EM wave gets a boost D) None of the above

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Answer & Solution

Answer: Option C

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75

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?

A) $$\frac{{\text{T}}}{2}$$ B) T C) $$\frac{{\text{T}}}{{\sqrt 2 }}$$ D) 2T

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Answer & Solution

Answer: Option A

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76

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

A) Amplitron B) Klystron C) Magnetron D) TWT

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Answer & Solution

Answer: Option D

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77

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

A) All diagonal elements are zero B) All diagonal elements are equal but not zero C) Are diagonal are complex D) Is hermitian

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Answer & Solution

Answer: Option A

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78

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?

A) 1, 2 and 3 B) 2, 3 and 4 C) 1, 3 and 4 D) 1, 2 and 4

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Answer & Solution

Answer: Option B

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79

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

A) to reduce spurious mode generation B) to reduce coupling of the signal C) To increase the bandwidth of the network D) Because it is more efficient

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Answer & Solution

Answer: Option C

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Microwave Communication MCQ Questions & Answers | ECE