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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Q. Consider the following statements

1. The amplitude of an FM wave is constant
2. FM is more immune to noise than AM
3. FM broadcasts operate in upper VHF and UHF frequency ranges
4.FM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments

Which of the above are correct?

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Q. Signal to noise ratio of microphone is defined as the ratio of output when the sound pressure is __________ to the output in the absence of any sound signal.

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Q. Fields are said to be circularly polarised if their magnitudes are

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Q. Three analog signals, having bandwidths 1200 Hz, 600 Hz, 600 Hz are sampled at their Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is

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Q. In a CD player the speed of CD is

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Q. In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t1 < t < t2. This indicates that during this interval

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Q. A fascimile reproduction has a specification of 200 lines per frame, progressive scanning and 5 frames per second. The time to scan one line is

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