Q. Each frequency in the modulating wave gives rise to four side bands.

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Q. Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.

Reason (R): The aspect ratio is 4 : 3

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Q. At night the ionosphere can be considered to be consisting of

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Q. A balun transformer gives an impedance transformation of

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Q. Which one of the following is true?

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Q. A 1000 kHz carrier wave modulated 40% at 40000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulator after transmission through the circuit?

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Q. The EHT voltage in a picture tube of TV is

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Q. Assertion (A): For satellites and space probes, PRF of a radar is pretty low.

Reason (R): PRF of a radar depends on the range of a radar.

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Q. An S/N ratio of 3 expressed in db is

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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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