Q. Directivity means

View solution

Q. If the oscillator output is modulated by audio frequencies upto 10 kHz, the frequency range occupied by the side bands will be

View solution

Q. The power to the portable unit of a cordless telephone is provided by

View solution

Q. In a AM wave the carrier and one of the side bands is suppressed. If m = 0.5, the percentage saving in power is

View solution

Q. Computer communication networks have

View solution

Q. Assertion (A): A balun is an RF impedance matching transformer.

Reason (R): Sometimes a booster amplifier is used with a TV set.

View solution

Q. In a TV, studio the function of vision switcher is to

View solution

Q. Y signal has maximum percentage of

View solution

Q. To ensure good transient response in audio systems the natural frequencies should be

View solution

Q. Consider the following features of monochrome TV

1. Number of lines per picture - 625
2. Interlace ratio - 2 : 1
3. Aspect ratio - 4 : 3
4. Channel bandwidth - 8 MHz

As regards CCIR system B, which of the above are correct?

View solution

Q. In the absence of noise, if C is channel capacity in bits/s, δf is channel bandwidth in Hz and N is number of coding levels. Then

View solution

Q. The open loop gain of an amplifier is 50 but is likely to change by 20%. If negative feedback with β = 0.1 is used, the change in gain will be about

View solution

Q. Audio amplifiers need

View solution

Q. For an ideal 3000 Hz channel, S/N ratio is

View solution

Q. Which of the following types of noise assumes greater importance at high frequencies?

View solution

Q. In transistor radio receivers the number of IF amplifier stages are

View solution

Q. To relay outdoor remotely located live programs, TV transmitter use

View solution

Q. If each short element of signal occupies 20 ms, the speed is

View solution

Q. The Hilbert transform of cos ω₁t + sin ω₂t is

View solution

Q. In ionosphere incidence angle is 60°. The maximum usable frequency fm is equal to

View solution