Noise figure of an amplifier depends on? Mark as favorite Copy Link Bandwidth Output power Power input None of these Check Answer
RF amplifiers are used in radio receivers for? Mark as favorite Copy Link Improved image frequency rejection Improved rejection of adjacent unwanted signals Prevention of radiation of the local oscillator through the antenna of the receiver All of the other options Check Answer
The term white noise refers to the following? Mark as favorite Copy Link A random signal with flat power spectral density A random signal generated by beat signal A random signal with long range correlation All of the above are true Check Answer
During heterodyne process in a receiver the modulation of the signal? Mark as favorite Copy Link Is totally eliminated Remains unaffected Increases decreases Check Answer
A super heterodyne radio receiver with an IF of 455 KHz is tuned to a signal at 1205KHz, the image frequency is? Mark as favorite Copy Link 910 KHz 1660 KHz 2865 KHz None of these Check Answer
AFC and AGC are respectively? Mark as favorite Copy Link Audio frequency control and automatic gain control Audio frequency control and automatic gate control Amplitude frequency control and automatic gain control Automatic frequency control and automatic gain control Check Answer
An antenna has 40 as antenna resistance and 60 as radiation resistance. What is the efficiency of the antenna? Mark as favorite Copy Link 3% 70% 60% 80% Check Answer
Modulation of signal during heterodyne process in a receiver? Mark as favorite Copy Link Decreases Finished totally Increases Remains unchanged Check Answer
When the antenna diameter is doubled, the gain of the antenna? Mark as favorite Copy Link Reduces by half Increases by 3 dB Reduces by 3 dB Increases by 6 dB Check Answer
A super heterodyne receiver with an intermediate frequency of 450 KHz is tuned to a signal at 1100 KHz, the image frequency is? Mark as favorite Copy Link 650 KHz 1550 KHz 800 KHz 2000 KHz Check Answer