Q. In colour TV receiver, varactor diode is used for

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Q. The number of noise sources in a BJT are

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Q. Energy content of atmospheric noise

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Q. As the frequency increases, the absorption of ground wave by earth's surface

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Q. The velocity of sound waves in air

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Q. The range of a cordless telephone is about

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Q. An earth mat for a communication tower consists of

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Q. Degaussing in a picture tube means

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Q. The rate at which information can be carried through a communication channel depends on

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Q. Some types of traps used in video IF amplifier of colour TV are

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Q. Direct and reflected sound waves may interfere with each other.

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Q. A carrier is simultaneously modulated by two sine waves having modulation indices of 0.4 and 0.3. The total modulation index will be

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Q. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?

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Q. A 400 W carrier is amplitude modulated with m = 0.75. The total power in AM is

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Q. c(t) and m(t) are used to generate an FM signal. If the peak frequency deviation of the generated FM signal is three times the transmission bandwidth of the AM signal, then the coefficient of the term cos [2π(1008 x 10³t)] in the FM signal (in terms of the Bessel Coefficients) is

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Q. Non-coherently detection is not possible for

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Q. Tracking of extra terrestrial objects requires

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Q. Assertion (A): Free space does not interfere with normal radiation and propagation of radio waves

Reason (R): Free space has no magnetic or gravitational fields.

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Q. Which of the following is taken as reference antenna for directive gain?

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Q. Push pull amplifier is

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