Q. In push button type telephone set, pressing a button generates

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Q. If sound wave has an intensity of 10 Pa. The dB level is about

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Q. The intermediate frequencies in VCR are

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Q. Assertion (A): In TV scanning is done from left to right and top to bottom.

Reason (R): Interlaced scanning is useful in eliminating flicker

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Q. The unit of loudness is

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Q. In frequency modulation noise can be further reduced by

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Q. Which one of the following is digital?

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Q. Automatic sensitivity control by target voltage control is easily possible in

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Q. Pick the odd one out

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Q. In a colour TV receiver SAW filter consists of

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Q. To couple a coaxial line to a parallel line wire it is best to use

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Q. The total bandwidth needed for an AM signal at 55.25 MHz with 0.5 MHz video modulation is

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Q. In PM, without any modulation, all the transmitted pulses have the same

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Q. Colour picture tube needs higher anode voltage and needs larger beam and cathode currents than monochrome tube because

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Q. The modulation index of an AM wave is changed from 0 to 1. The transmitted power is

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Q. In a radio receiver the input from local oscillator is fed to

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Q. A shadow zone does not receive any space wave

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Q. A radio frequency signal contains the following three frequencies :

850 kHz; 865 kHz and 875 kHz

In order to amplify this signal, which of the following amplifier should be selected?

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Q. Which of the following pulse-time modulation is least used?

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Q. FM has

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