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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Q. Which of the following sampling frequencies is considered adequate in voice telephony?

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Q. In telephone systems the relation between load ρ, number of calls initiated during a specified interval λ and average duration of a call (h) is

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Q. In a Vidicon camera tube

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Q. In a CD the sampling frequency is nearly

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Q. Consider the following statements about loop antenna

1. It is suitable for direction finding application
2. It is a single turn or multiturn coil carrying RF current
3. The loop is surrounded by a magnetic field everywhere perpendicular to the loop

Which of the above statements are correct?

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Q. Which of the following is present in both TRF receiver and superheterodyne receiver?

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Q. Which camera tube has highest dark current?

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Q. If a sound wave has a frequency of 50 Hz, the wavelength is

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