Q. If each short element of signal occupies 20 ms, the speed is

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Q. The Hilbert transform of cos ω₁t + sin ω₂t is

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Q. In ionosphere incidence angle is 60°. The maximum usable frequency fm is equal to

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Q. The generally used value of EHV supply in TV receivers is

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Q. The number of channels available in MF band (300 kHz - 3 MHz) for AM modulating signal of 20 kHz is

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Q. The function of blend control in stereo system is

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Q. The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is

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Q. In a reactance FET, gm = 9 x 10‾³ Siemens, gate to source resistance is one-ninth of reactance of gate to drain capacitor and frequency is 4 MHz. The capacitive-reactance is

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Q. Audio cassettes used in household tape recorders have a width of

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Q. The receiver of a pulsed RADAR can detect signal power in the order of

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Q. In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is

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Q. The number of channels in a stereophonic system is

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Q. When the carrier is unmodulated, a certain transmitter radiates 9 kW when the carrier is sinusoidally modulated the transmitter radiates 10.125 kW. The modulation index will be

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Q. A signal x(t) = 100 cos (24π x 10³t) is ideally sampled with a sampling period of 50 μ sec and then passed through an ideal low pass filter with cut off frequency of 15 kHz Which of the following frequencies are present at the filter output?

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Q. A sinusoidal voltage of 2 kV peak value is amplitude modulated to give 20% modulation. The peak value of each side band term is

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Q. Consider the following reasons for using antenna coupler

1. To prevent illegal radiation of spurious frequencies
2. To tune out reactive components of antenna impedance
3. To have correct value of load impedance for transmitter

Which of the above are correct?

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Q. Which of the following microphones works on the principle of Faraday's law?

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Q. In a CE amplifier connection, the emitter is at ground potential for

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Q. In an AM wave with m = 1, the carrier is suppressed. The resulting power saving will be

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Q. Directive gain is

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