Q. In a low level amplitude modulated system, the amplifier modulated stage must be

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Q. A noise can be represented as superposition of spectral components. When this noise is passed through a narrow band filter, the output of filter should look like

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Q. A narrow band noise show

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Q. The upper and lower side frequencies for 3 kHz audio modulation with a 27 MHz carrier frequency will be

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Q. Consider the following advantages of phase array radar

1. simple circuitry
2. ability to track and scan simultaneously
3. ability to track many targets together
4. very fast scanning

Which of the above are correct?

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Q. An antenna having a length of λ/4 and grounded at one end is called

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Q. The noise figure of individual stages of a two stage amplifier is 2.03 and 1.54 respectively. If gain of first stage is 62, the overall noise figure is

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Q. A trinitron colour picture tube uses

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Q. Which of the following circuits cannot be demodulate SSB?

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Q. During day time ionosphere can be considered to be consisting of

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Q. Baudot code is a six bit code.

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Q. PWM can be generated

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Q. Consider the following statements as regards SAW filter

1. The centre frequency is determined by the pitch of IDT comb shaped electrodes
2. The response can be modified shaping the overlap of comb electrodes
3. The response is maximum when acoustic wave has its wavelength equal to pitch
4. When a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin x)/x

Which of the above statements are correct?

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Q. In telephone, the dial tone has a frequency of

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Q. Companding is used

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Q. For a good public address system the sound intensity at the farthest point should be at least

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Q. An ungrounded antenna near the ground

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Q. Reception through space wave is limited to line of sight distance.

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Q. A video transmission system transmits 625 picture frames per second. Each frame consist of a 400 x 400 pixel grid with 64 intensity levels per pixel. The data rate of the system is

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Q. Which of the following is a false statement about Armstrong modulation system?

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