Q. Assertion (A): Free space does not interfere with normal radiation and propagation of radio waves

Reason (R): Free space has no magnetic or gravitational fields.

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Q. Which of the following is taken as reference antenna for directive gain?

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Q. Push pull amplifier is

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Q. When the channel is noisy, producing a conditional probability of error p = 0.5; the channel capacity and entropy function would be, respectively,

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Q. In CCIR-B system, the time between start of one H syn. pulse and next is

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Q. Counterpoise is used in coils having

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Q. In standing wave pattern on a transmission line

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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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