Q. A photo diode converts light signals to binary.

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Q. A three stage telephone switching structure is to have 128 input and 128 output terminals. It has been found that at peak time the utilization probability is 0.1. The number of intermediate links required for non-blocking configuration is 15. If the actual number of intermediate links is 5, the probability of blocking of call is

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Q. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

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Q. If carrier modulated by a digital bit stream had one of the possible phases of 0°, 90°, 180°, 270°, then the modulation is called.

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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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