Q. In a radio receiver the input from local oscillator is fed to

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Q. A shadow zone does not receive any space wave

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Q. A radio frequency signal contains the following three frequencies :

850 kHz; 865 kHz and 875 kHz

In order to amplify this signal, which of the following amplifier should be selected?

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Q. Which of the following pulse-time modulation is least used?

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Q. FM has

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Q. The service area of a TV transmitter is a little beyond radio horizon.

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Q. Bit is a unit of

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Q. Frequency shifting keying is basically a method involving

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Q. Which of the following codes provides parity checks?

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Q. PA radar means

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Q. Dynamic range of hi-fi system is at least

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Q. A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through

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Q. The seven segment display used in watches and clocks generally uses

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Q. If e = 10 sin(10⁸ t + 3 sin 10⁴ t) then modulating frequency is

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Q. When a signal is quantized such that the step size S is small in comparison with the peak to peak range of the signal, the mean square quantization error is equal to

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Q. Assertion (A): Many times a radar cannot detect 'grounding hopping' military aircraft.

Reason (R): Ground interference limits the range of radar.

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Q. Entropies associated with an extremely unlikely message and that with an extremely likely message are respectively

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Q. For TV broadcast, picture signal is modulated in

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Q. Assertion (A): Stubs, directional couplers and baluns are very commonly used in communication systems

Reason (R): Characteristic impedance of a line is an important parameter.

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Q. Audio frequency range lies between

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