Q. The material used for the magnet of moving coil cone type loudspeaker is

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Q. CCIR system B employs

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Q. The power to the base unit of a cordless telephone is supplied by

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Q. In cellular telephone each cell is designed to handle

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Q. A UPS contains

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Q. A transmitter power of 10 W is increased by 30 dB. The effective radiated power is

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Q. It is desired to couple a coaxial line to a two parallel wire line. It is best to use

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Q. 24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is

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Q. If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about

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Q. A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is

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Q. In FM, as bandwidth increases

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Q. A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is

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Q. In TV transmitter, the function of duplexer is

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Q. The PSD and the power of a signal g(t) are respectively Sg(ω) and Pg, the PSD and the power of signal a.g(t) are respectively

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Q. The simplest method of suppression of unwanted side band in AM is

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Q. For attenuation of low frequencies we should use

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Q. Assertion (A): A colour TV uses a SAW filter to give stable band pass response and high gain.

Reason (R): Devices using SAW principle are used in many systems.

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Q. In an FM signal, the modulating frequency is 2 kHz and maximum deviation is 10 kHz. The bandwidth requirement is

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Q. The effective length of antenna is different from actual length due to

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Q. In a TV receiver there is no raster, no picture and no sound. The most likely defective stage is

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