Q. Assertion (A): If frequency is high, the distance between transmitter and antenna may be an appreciable fraction of wavelength

Reason (R): Wavelength is inversely proportional to frequency.

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Q. Speeds of sound and radio waves are equal.

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Q. When Pc is the unmodulated carrier power and Pt is the total power in the modulated wave, then the maximum power in AM wave is

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Q. Thermal noise is passed through an ideal low pass filter having cut off at fc = ω Hz. The auto-correlation value of the noise at the output of the filter is given as

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Q. The tuned circuit of the oscillator in a simple AM transmitter employs a 50 H coil and a 1 nanofarad capacitor. If the oscillator output is the carrier frequency will be

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Q. In a low level AM system, the amplifier which follows the modulated stage must be the

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Q. In a square law modulator, the carrier frequency should be __________ times than the highest modulating frequency.

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Q. CSSB stands for

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Q. Tropospheric scatter is used with frequencies in the range of

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Q. In Modulation, "carrier" is

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Q. Which one of the following blocks is not common in both AM and FM receivers?

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Q. If the variance σx² of d(n) = x(n) - x(n - 1) is one-tenth the variance σx² of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function Rxx(x)/σx² at k = 1 is

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Q. Which of the following is not advantage of FM over AM?

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Q. In single tone FM discriminator (S₀/N₀) is

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Q. In a PCM the amplitude levels are transmitted in a 7 unit code. The no. of levels is

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Q. In high power AM transmission modulation is done at

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Q. Which one of the following gives maximum probability of error?

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Q. In FM, which one is correct?

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Q. In FM, increased depth of modulation increases

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Q. Which of the following frequency is likely to be associated with AM radio broadcast?

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