Q. In TV transmitter some possible advantages of IF modulation are

1. The modulator section and visual exciter can be solid state devices
2. VSB filter can be introduced at low power level
3. The subsequent stages following VSB filter can be tuned permanently for wideband linear operation
4. It is economical

which of the above are true?

View solution

Q. A source is radiating power equally in all directions. If source power is P, the power density at distance d is

View solution

Q. As compared to AM, FM requires

View solution

Q. Capture effect occurs in

View solution

Q. Household taperecorders generally use

View solution

Q. In AM receiver the oscillator frequency is

View solution

Q. A photo diode converts light signals to binary.

View solution

Q. A three stage telephone switching structure is to have 128 input and 128 output terminals. It has been found that at peak time the utilization probability is 0.1. The number of intermediate links required for non-blocking configuration is 15. If the actual number of intermediate links is 5, the probability of blocking of call is

View solution

Q. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

View solution

Q. If carrier modulated by a digital bit stream had one of the possible phases of 0°, 90°, 180°, 270°, then the modulation is called.

View solution

Q. In FM, when the bandwidth is doubled, the signal to noise ratio improves by a factor of

View solution

Q. Pilot-carrier transmission is one in which

View solution

Q. AM-SC stands for

View solution

Q. FM has poor efficiency than

View solution

Q. The number of spectral component when two sine wave of same frequency multiplied is

View solution

Q. Public address systems generally use electret microphones.

View solution

Q. The noise at the input to an ideal frequency detector is white. The detector is operating above threshold. The power spectral density of the noise at the output is

View solution

Q. As regards BCH code, Hamming code and Reed-Solomon code

View solution

Q. Which of the following form of angle modulation, If e = 10 sin(10⁸ t + 3 sin 10⁴ t)

View solution

Q. The noise performance of a square law demodulator of AM signal is

View solution