Q. In TV systems, equalising pulses are sent during

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Q. A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

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Q. The main function of a balanced modulator is to

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Q. FM transmitting and receiving equipment as compared to AM equipment is

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Q. An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 10⁶ Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

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Q. If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

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Q. Which one of the following is analog?

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Q. The disadvantage of FM over AM is that

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Q. Transistor T1 operates at 30 kHz and T2 operates at 300 Hz. The flicker noise is

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Q. A pre-emphasis circuit provides extra noise immunity by

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Q. A tape recorder and deck are entirely similar.

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Q. Assertion (A): SSB systems generally have duplex operation

Reason (R): SSB systems are generally used in two way communication.

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Q. Which of the following is a digital modulation technique?

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Q. Which of the following is used to generate PDM?

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Q. A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

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Q. What is the purpose of peak clipper circuits in radio transmitters?

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Q. In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

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Q. Under ordinary circumstances, impulse noise can be reduced in

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Q. In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

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Q. If sampling is done at the rate of 10 kHz. The bandwidth required is

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