Q. A resistor of 10 kΩ has an rms noise voltage of 1 mV under a certain set of conditions. A resistor of 20 kΩ under the same conditions will have an rms noise voltage of

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Q. Assertion (A): EM waves are attenuated as they travel outward from a source

Reason (R): Both field intensity and power density follow inverse square law.

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Q. The frequency response of a microphone means

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Q. Graphic equaliser system in stereophonic systems generally have

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Q. An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10‾²³ J/K)

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Q. Some sources of TV programs are

1. TV camera
2. Telecine
3. VTR
4. External signal

Which of the above are actually present in a TV studio?

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Q. Compact discs use

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Q. A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is

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Q. In a communication receiver, a squelch circuit is normally inserted

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Q. In PCM, the information lies

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Q. In PCM the amplitude levels are transmitted in a 7 unit code. Sampling frequency is 10 kHz. The bandwidth should be

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Q. In colour television V and U signals are

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Q. Which of the following has highest power gain?

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Q. Two messages m1, and m2 have a probability of 0.5 each. The entropy is

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Q. A TV receiver is 40 cm wide and 30 cm high. The EHT supply required is about

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Q. The total number of pulses in a TV remote control is

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Q. Which camera tube has highest sensitivity and very wide spectral response?

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Q. Assertion (A): A Smith chart can be used for a number of calculations of a transmission line

Reason (R): Smith chart is basically a polar impedance diagram.

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Q. A computer monitor uses 180 W in normal operation and 20 W in sleep mode. The computer is on all the 24 hours but is in sleep mode for 18 hours a days. The energy units saved in 30 days are

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Q. Consider the following functions

1. It detects the AM video carrier IF so as to produce the video signal
2. It produces and separates out the inter carrier sound IF of 5.5 MHz
3. It amplifies the video signal
4. It amplifies the audio signal

The video detector in a colour TV performs which of the above functions

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