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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Q. Which of the following terms is not applicable to Yagi-Uda array?

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Q. If transmission path, in PCM, is very long then

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Q. In a single tone AM the power of carrier is P and modulation index is m. The powers of each of the two side bands are

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Q. If F(ω) is Fourier transform of f(t), then the Fourier transform of f(t) cos ωct is

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Q. In a TV receiver the raster is normal but there is no sound and quality of picture is poor. The defective part is

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Q. Foster Seeley discriminator uses a

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Q. Which of the following statement about modulation is correct?

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