Q. The most commonly used system of modulating for telegraphy is

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Q. Which of the following antennas is not wide band?

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Q. In phase shift keying the input signal is

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Q. A circuit which cannot demodulate SSB is

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Q. In TV system in India IF video and IF audio frequencies are

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Q. While AM has __________ frequencies, FM has __________ number of sidebands.

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Q. In VHS format diameter of head drum is about

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Q. The correct sequence of subsystem in an FM receiver is

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Q. A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is

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Q. Short circuited stubs are preferred to O.C stubs because

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Q. Assertion (A): In FM all power amplifiers can be operated in class C

Reason (R): FM is a constant amplitude modulation system.

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Q. In radar system which of the following is called A scope

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Q. In a CD the channel separation is

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Q. The unit for luminous energy is

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Q. The IF bandwidth of a radar receiver is inversely proportional to

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Q. If the radiated power of AM transmitter is 10 kW, the power in the carrier for modulation index of 0.6 is nearly.

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Q. Satellite communication uses frequencies in the range of

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Q. In a channel voice coder, the outputs of sixteen 20 Hz low pass filters are sampled, multiplexed and A/D converted. If sampling is at 40 samples/second and 3 bits/sample represents each voltage sample, the bit rate is about

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Q. Super high frequency means more than 3000 MHz.

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Q. Impedance inversion may be obtained with

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