Noise generated in a resistor is also known as partition noise white noise therm

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Question
Noise generated in a resistor is also known as
Options
A. partition noise
B. white noise
C. thermal noise
D. shot noise

Correct Answer

thermal noise

Radio Receivers problems

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1. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 25 MHz will be
Options
A. 24.09 MHz
B. 24.54 MHz
C. 25.45 MHz
D. 25.91 MHz

2. In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be
Options
A. 1655 kHz
B. 2110 kHz
C. 745 kHz
D. 910 kHz

3. In a radio receiver with simple AGC
Options
A. the highest AGC voltage is produced between stations
B. the faster the AGC time constant, the more accurate the output
C. an increase in signal strength produces more AGC
D. the audio stage gain is normally controlled by AGC

5. For the system in the given figure the characteristic equation is
Options
A.
B.
C. K(s + 1)(s + 3) = 0
D. s(s + 2) = 0

8. In a radio receiver, if the intermediate frequency is too low
Options
A. Image-frequency rejection will improve
B. Selectivity will be too sharp
C. The frequency selectivity of the local oscillator will have to be lowered
D. All of the above

9. In a broadcast superheterodyne receiver
Options
A. the local oscillator operates below the signal frequency
B. local oscillator frequency is normally double the IF
C. RF amplifier normally works at kHz above the carrier frequency
D. mixer input must be tuned to the signal frequency

10. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver
Options
A. Unsuitability will occur
B. Heterodyne whistles will be heard
C. Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible
D. All of the above

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