Microwave Engineering MCQ Questions Answers Electronics ECE

Microwave Engineering MCQ Questions Answers – Electronics & Communication Engineering (ECE)

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1) HEMT used in the microwave circuit is a

a) source

b) high power amplifier

c) low noise amplifier

d) detector

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2) Klystron operates on the principle of
a) Amplitude Modulation
b) Frequency Modulation
c) Pulse Modulation
d) Velocity Modulation

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3) A cavity resonator can be represented by

a) an LC circuit

b) an LCR circuit

c) a lossy inductor

d) a lossy capacitor

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4) Ionospheric preparation is not possible for microwaves because

a) Microwaves will be fully absorbed by the ionospheric layers
b) There will be an abrupt scattering in all directions
c) Microwave will penetrate through the ionospheric layers
d) There will be dispersion of microwave energy

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5) If the peak power of pulsed microwave system is 10⁴ W and the average power is 800 W, the the duty cycle will be

a) 80%

b) 8%

c) 0.8%

d) 0.08%

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6) The noise produced in a microwave tube due to random nature of emission and electron flow is called
a) Partition noise
b) Shot noise
c) Johnson noise
d) Shannon noise

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7) Which of the following is not possible in a circular wave guide ?

a) TE₁₀

b) TE₀₁

c) TE₁₁

d) TE₁₂

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8) The pulse frequency is equal to

Duty cycle/pulse width

The reciprocal of the pulse repetition rate

Pulse width x peak power/average power

All of these

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9) The maximum theoretical output circuit efficiency of a double resonator klystron amplifier is

a) 25%

b) 50%

c) 58%

d) 85%

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10) Which of the following can be used for amplification of microwave energy?
a) Travelling wave tube
b) Magnetron
c) Reflex Klystron
d) Gunn diode