# Noise Characteristics of Receivers MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Noise Characteristics of Receivers”.

1. Equivalent noise temperature of a transmission line connecting the antenna to the receiver is:
a) TP (LP-1)
b) TP (LP + 1)
c) TP/ (LP-1)
d) TP / (LP + 1)

2. In a receiver, if the noise figure of the mixer stage in the receiver is 7 dB, then the equivalent noise temperature is given that the receiver is operating at 290 K:
a) 1163 K
b) 1789 K
c) 1000 K
d) 1234 K

3. The noise power will determine the maximum detectable signal level for a receiver.
a) True
b) False

4. If a transmission line connecting the antennas to the receiver has a loss of 1.5 dB, given the physical temperature is 270C, noise equivalent temperature is:
a) 123 K
b) 145 K
c) 345 K
d) 234 K

5. If a receiver is operating at a bandwidth of 1 MHz and has antenna noise temperature of 210 K, then the input noise power is:
a) -90 dBm
b) -115 dBm
c) -56 dBm
d) -120 dBm

6. If the received power at antenna terminals is -80dBm, and if the input noise power is -115 dBm, then the input SNR is:
a) 45 dB
b) -195 dB
c) -35 dB
d) 35 dB

7. Given that the antenna efficiency is 0.9, equivalent brightness temperature is 200 K; physical temperature is 300 K, noise temperature of an antenna is:
a) 220 K
b) 210 K
c) 240 K
d) None of the mentioned

8. Antenna noise temperature of a system is 210 K, noise temperature of transmission line is 123 K, loss of a transmission line connecting the antenna to receiver is 1.41 and noise temperature of the receiver cascade is 304 K. then the total system noise temperature is:
a) 840 K
b) 762 K
c) 678 K
d) 1236 K

9. A receiver system is operating at a bandwidth of 1 MHz and has a total system noise temperature of 762 K. then the output noise power is:
a) -110 dBm
b) -234 dBm
c) -145 dBm
d) -124 dBm

10. If the received power at the antenna terminals is Si=-80 dBm and the output noise power is -110 dBm then the output signal to noise ratio is given by:
a) 30 dB
b) -30 dB
c) 35 dB
d) -35 dB