Q. At a given probability of error, binary coherent FSK is interior to binary coherent PSK by

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Q. In a TV receiver the video IF amplifier provides a gain of about

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Q. Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?

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Q. Switching systems

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Q. Which one of the following statements is wrong. The radar cross-section of a target?

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Q. Tuned voltage amplifiers are not used

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Q. If B is the bandwidth, the thermal noise voltage is proportional to

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Q. ARQ stands for

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Q. MTSO stands for

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Q. The main advantage of TDM over FDM is that it

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Q. VLF waves are sometimes used because

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Q. Which of the following is very useful as multiband HF receiving antenna?

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Q. Assertion (A): A video monitor does not need RF tuner and IF amplifier

Reason (R): The picture tube in TV is basically a CRT.

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Q. Consider the following statements as regards IF in radio receivers

1. If IF is too high, poor selectivity and poor adjacent channel rejection could result
2. If IF is high, tracking difficulties increase
3. A very low IF makes selectivity too sharp
4. As IF is decreased, image frequency rejection becomes better

Which of the above are correct?

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Q. Audio-signal modulates a 125 MHz carrier, causing a frequency deviation of 5 kHz. The bandwidth of the narrowband FM signal is __________ kHz.

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Q. Assertion (A): Radar gave birth to microwave technology.

Reason (R): In radar systems very high frequencies give the most accurate results.

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Q. A channel has a SNR of 7 and BW 4 kHz. Keeping the channel capacity (BPS) same, the BW is reduced to accommodate more channels. The SNR

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Q. In amplitude modulation the rms value of radio frequency voltage after 40% modulation is 60 mV. If modulation is 80% the rms value after modulation will be about

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Q. 1 GHz is equal to

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Q. Consider the following statements

1. In a pulsed radar, the transmitted pulses are of high frequency
2. In a pulsed radar, the transmitted pulses are of high power
3. In a pulsed radar, the transmitted pulses are of brief duration
4. In a pulsed radar, the transmitted pulses are of square wave shape.

Of the above statements the correct statements are

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