Q. Some possible disadvantages of high level modulation in TV transmitters are

1. Video monitor has to supply high video voltages upto several hundred volts into highly capacitive loads drawing high current at video frequencies
2. The grid modulated stage presents a varying load to its driver
3. The linearity and high video driving power present design problems

Out of above which are true?

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Q. Beam width of an antenna is expressed in

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Q. In broadcast television, the number of lines per frame is chosen to be odd number to

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Q. In a picture tube, the video signal is applied to

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Q. If frames are repeated at 60 Hz and each frame has 525 lines, the time for scanning one horizontal line (for progressive scanning and no interlacing) is about

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Q. The name modem is a contraction of terms modulator demodulator.

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Q. The use of SSB

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Q. Video signals are transmitted through

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Q. A TV receiver has 20 kV EHT supply and total beam current (for 3 electron guns) of 1500 μA. The power handled by IHVT is

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Q. Full duplex operation

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Q. In a tape recorder the erase head is

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Q. Consider the following statements as regards advantages of CCD sensors as camera pick up tube

1. High sensitivity
2. Good spectral response
3. Image lag absent

Out of the above which are correct

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Q. Some desirable features of a computer communication network are

1. It should accept an intended transmission without excessive delay
2. The data arriving at a receiving point should be processed rapidly
3. When a transmission calls for a response, the delay of response should be minimum.

Which of the above are true?

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Q. Television transmission is by

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Q. In the television system in India, the aspect ratio is

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Q. In high power radars, which of the following are used for switching?

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Q. A remote control for TV uses

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Q. In the FM wave described by equation v = 15 sin (4 x 10⁸ t + 3 sin 1100 t), the carrier frequency and signal frequency respectively are

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Q. In the television system in India, the odd and even fields are scanned

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Q. Consider the following:

1. A signal f(t) and its Hilbert transform fh(t) have the same energy density spectrum
2. A signal f(t) and its Hilbert transform, fh(t) have the same auto correlation function
3. A signal f(t) and its Hilbert transform are mutually orthogonal

Which of the above are true?

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