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

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Q. Pilot-carrier transmission is one in which

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Q. AM-SC stands for

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Q. FM has poor efficiency than

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

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Q. Public address systems generally use electret microphones.

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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

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

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

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

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Q. In AM the amplitude of carrier components ... while in FM it

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Q. In a colour TV receiver, the function of comb filter is

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Q. A communication receiver is

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Q. In PCM, bit duration is defined as

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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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