Microwave Communication MCQ Questions & Answers

1

Coupling into and out of a traveling-wave tube can be accompanied by a

A) Waveguide match B) Cavity match C) Direct coax-helix match D) All of the above

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Answer & Solution

Answer: Option D

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2

When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

A) A long time constant B) Low-pass filters C) The shortest possible time D) The restricted high-frequency response

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Answer & Solution

Answer: Option C

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3

The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:
where R = effective earth radius (m) and L = path length (m)

A) $${\text{S}} = \frac{{2\lambda {\text{R}}}}{{\text{L}}}$$ B) $${\text{S}} = \frac{{3\lambda {\text{R}}}}{{\text{L}}}$$ C) $${\text{S}} = \frac{{\lambda {\text{R}}}}{{\text{L}}}$$ D) $${\text{S}} = \frac{{\text{L}}}{{\lambda {\text{R}}}}$$

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Answer & Solution

Answer: Option B

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4

The aquadag coating on the inside of PPI tube is used

A) To focus the beam of primary electrons B) To shield the electron beam from unidirectional magnetic C) As a second anode and to prevent the build-up of secondary field D) All of these

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Answer & Solution

Answer: Option C

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5

What allow microwave to pass in only one direction?

A) RF emitter B) Capacitor C) Varactor-triac D) Ferrite emitter

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Answer & Solution

Answer: Option D

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6

If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the

A) $$\pi $$ mode B) $$\frac{\pi }{2}$$ mode C) $$2\pi $$ mode D) $$\frac{\pi }{4}$$ mode

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Answer & Solution

Answer: Option A

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7

Oscillators of a klystron tube are maintained

A) By bunches of electrons passing the cavity grids B) By plate-to-cathode feedback C) By feedback between the accelerating grid and the repeller D) By circulating bunches of electrons within the cavities.

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Answer & Solution

Answer: Option A

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8

A PPI cathode-ray tube as used on a radar set

A) Is used to check the percentage of modulation B) Indicates both the range and azimuth of a target C) Indicates only the range of a target D) Is used for receiver alignment

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Answer & Solution

Answer: Option B

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9

It is possible to increase the maximum range of a radar equipment by

A) Lowering the pulse frequency B) Raising the peak power of the transmitter C) Narrowing the beam width and increasing the pulse duration D) All of these

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Answer & Solution

Answer: Option D

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10

A high-power microwave pulse of the order of megawatts can be generated by a

A) Traveling-wave tube B) Magnetron C) Reflex klystron D) Gunn diode

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Answer & Solution

Answer: Option B

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Microwave Communication MCQ Questions & Answers | ECE