Q. In amplitude modulation

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Q. At f = 7 GHz, a 120 cm dish antenna gives a gain of about

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Q. PIL colour picture tube has the main advantage that

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Q. What is the frequency of the modulated carrier wave?

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Q. In high power AM transmission, modulation is done at

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Q. The noise sources shot noise, partition noise and thermal noise are associated with which component

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Q. Consider the following statements as regards communication receiver

1. Variable sensitivity is used to eliminate selective fading
2. A product demodulator can be used to receive Morse code
3. The noise limiter cuts off receiver output during a noise pulse
4. Double conversion is used to improve image rejection

Which of the above statements are correct?

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Q. In a transmission line, losses due to dielectric heating are

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Q. The power rating of radio transmitters is around

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Q. Which of the following microphones has bidirectional feature?

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Q. In TV transmitter some possible advantages of IF modulation are

1. The modulator section and visual exciter can be solid state devices
2. VSB filter can be introduced at low power level
3. The subsequent stages following VSB filter can be tuned permanently for wideband linear operation
4. It is economical

which of the above are true?

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Q. A source is radiating power equally in all directions. If source power is P, the power density at distance d is

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Q. As compared to AM, FM requires

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Q. Capture effect occurs in

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Q. Household taperecorders generally use

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Q. In AM receiver the oscillator frequency is

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Q. A photo diode converts light signals to binary.

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Q. A three stage telephone switching structure is to have 128 input and 128 output terminals. It has been found that at peak time the utilization probability is 0.1. The number of intermediate links required for non-blocking configuration is 15. If the actual number of intermediate links is 5, the probability of blocking of call is

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Q. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

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Q. If carrier modulated by a digital bit stream had one of the possible phases of 0°, 90°, 180°, 270°, then the modulation is called.

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