Q. In a circuit the value of resistor is made four times. The noise voltage generated by this resistance will

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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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