Q. As EM waves travel in free space they get

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Q. Cross talk is due to reception of portions of a signal from one channel into another.

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Q. If there are M equally likely and independent messages and M = 2ᴺ where N is an integer, the information in each message is equal to

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Q. A radar beacon is a small radar set having a receiver, a separate transmitter and an antenna.

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Q. In the above case the total power in the modulated wave double sideband, suppressed carrier AM will be

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Q. If the plate supply voltage for a plate modulated class C amplifier is E, the maximum plate cathode voltage could be almost as high as

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Q. If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be

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Q. The characteristics of H and V sync pulses in a colour TV receiver are

1. H sync, pulses are narrow and have frequency of 15625 Hz
2. V sync, pulses are much wider and have frequency of 50 Hz
3. H and V pulses have almost the same size but frequencies of 15625 and 50 Hz respectively
4. V sync, pulses are very narrow but H sync, pulses are wide and their frequencies are 15625 Hz and 50 Hz respectively

Which of the above are correct?

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Q. Bandwidth for practical PCM system is (where n is no. of channels, N length of PCM codes)

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Q. Circuit switching, Message switching and Packet Switching Network belong to which of the following systems?

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Q. Which of the following is the main advantage of PCM system?

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Q. BPSK stands for

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Q. If a dipole is meant for a frequency of 1 MHz, the length of each rod is about

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Q. Consider the following statements:
In a radar system having a high value of the ratio (antenna diameter)/wavelength

1. the maximum range is large
2. good target discrimination is achieved
3. capture area is increased
4. target acquisition is difficult

Which of the above are correct?

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Q. Assertion (A): The maximum range of a radar is proportional to fourth root of the peak transmitted pulse power.

Reason (R): Radar signals are subjected twice to inverse square law.

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Q. The decoder for PAL system is

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Q. CW Doppler radar is capable of giving accurate measurements of relative velocities.

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Q. In the stabilized reactance modulators AFC system

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Q. An antenna is 30 metre high. The frequency is 1 MHz. The radiation resistance is about

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Q. Which of the following codes is based on BCD format?

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