Q. Consider the following applications/ advantages of radar beacons

1. navigation
2. target identification
3. accurate tracking of enemy targets
4. large increase in maximum range

Which of the above are correct?

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Q. The signal plate of vidicon tube is coated with tin oxide.

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Q. The maximum permissible distance between two samples of a 10 kHz signal

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Q. In telephone systems, load is expressed in the unit of

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Q. Which of the following can be used to convert PPM into PWM?

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Q. For an antenna of height ht metres, the radio horizon is equal to

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Q. If in a radio receiver, RF signal has a frequency of 800 kHz and local oscillator that of 1000 kHz, then at the output of the mixer, the frequencies found would be __________ kHz.

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Q. In the stabilized reactance modulator AFC system

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Q. In AM, the modulation envelope has a peak value double the unmodulated carrier level, when the modulation is

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Q. A bit synchronizer regenerates at the receiver a clock waveform which is

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Q. Probability of error in DPSK is less than PSK

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Q. Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be

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Q. Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is

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Q. In radar display system PPI stands for

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Q. When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to

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Q. A pre-emphasis circuit provides extra noise immunity by

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Q. The function of a modulator is to

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Q. Which of the following radio waves are not reflected by ionosphere?

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Q. Square law modulators utilise

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Q. Which of the following is a disadvantage of Vestigial Sideband (VSB) system?

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