Q. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to

View solution

Q. A padder is basically a/an

View solution

Q. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is

View solution

Q. Selectivity varies with receiving frequency, frequency is raised.

View solution

Q. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10¯⁵ ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is

View solution

Q. In an FM signal, the power

View solution

Q. RF amplifiers are used in radio receivers for

View solution

Q. 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. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is

View solution

Q. Three point tracking can be achieved with

View solution

Q. Double spotting in a receiver is due to

View solution

Q. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of

View solution

Q. The IF stage of a receiver employs

View solution

Q. In a receiver, which of the following device has RF input but IF output?

View solution

Q. Statement 1:
Diode is the most common device used for demodulation.

Statement 2:
A discriminator is a FM detector.

View solution

Q. A receiver having poor IF selectivity will also have poor

View solution

Q. The source of which of the following noise is different from that of the remaining?

View solution

Q. The household radio receiver uses

View solution

Q. In a transistor receiver, the use of FET as the first stage amplifier is likely to

View solution

Q. In a FM waveform, the side bands are spaced at intervals equal to

View solution

Q. Power spectral density of white noise

View solution