# Noise in Micro-Wave circuits MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Noise in Micro-Wave circuits”.

1. ________ noise occurs due to the random fluctuation of charge in an electron tube.
a) Flicker noise
b) Shot noise
c) Thermal noise
d) White noise

2. Flicker noise occurs in solid-state components and vacuum tubes.
a) True
b) False

3. The type of noise caused by vibration of bound charges is called:
a) Thermal noise
b) Shot noise
c) Flicker noise
d) None of the mentioned

4.________ noise is caused by random motion of charges in ionized gas.
a) Plasma noise
b) Quantum noise
c) Thermal noise
d) Flicker noise

5. An X- band amplifier has a gain of 20 dB and a gain of 1GHz bandwidth. Noise figure of the amplifier is -62 dBm at 290 K and -64.7 dBm at 77 K. then the Y factor of the amplifier is :
a) 3 dB
b) 6.4 dB
c) 2.7 dB
d) 5.6 dB

6. An amplifier has a noise equivalent temperature of 170 K. If the amplifier is used with a source having an equivalent noise temperature of TS=450 K, the output noise power of the amplifier is:
a) -50 dBm
b) -60 dBm
c) -60.7 dBm
d) -55 dBm

7. The most insignificant form of noise is:
a) Plasma noise
b) Quantum noise
c) Shot noise
d) Flicker noise

8. The Y factor of an amplifier obtained by measuring the noise figure at the temperatures 77 K and 290 K is 2.7 db. Then the equivalent noise temperature of the amplifier is:
a) 100 K
b) 150 K
c) 170 K
d) None of the mentioned

9. The noise power associated with a two port network modeled as thevinin equivalent is:
a) kTB
b) k/TB
c) TB/ K
d) None of the mentioned

10. Equivalent noise temperature associated with an arbitrary white noise source is:
a) N0/GKB
b) N0
c) N0/ kB
d) None of the mentioned

11. Excess noise ratio is defined as the ratio of generator noise to the noise associated with room temperature
a) True
b) False

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