Q. If the bandwidth is increased by 2, the γFM γAM (where γ is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of

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Q. A carrier wave carries information.

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Q. Frequency shift keying is used mostly in

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Q. A generator is feeding power to a transmission line of characteristic impedance Z0. The line is terminated in impedance ZL. Standing waves will be set up if

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Q. In sound recording the degree of pre-emphasis is about 6 dB/ octave.

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Q. Space wave may be a direct wave or wave reflected from earth.

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Q. Radio broadcasts are generally

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Q. If the frequency of a wave 20 Hz, the time period is

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Q. In radar systems PRF stands for

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Q. Which of the following cannot be the Fourier series expansion of a periodic signal?

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Q. Which of the following is the indirect way of FM generation?

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Q. A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is

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Q. A cordless telephone using separate frequencies for transmission in base and portable units is known as

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Q. For attenuation of high frequencies we should use

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Q. A modem is classified as low speed if data rate handled is

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Q. VSB modulation is preferred in TV because

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Q. A woofer should be fed from the input through a

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Q. It is desired that transmission line and load should match for a range of frequencies. The best method is

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Q. Which of the following has the highest input impedance?

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Q. In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is

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