Q. If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if fm = 500 Hz, Δf = 2.25

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Q. In TV scanning sequence of lines is

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Q. In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by

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Q. A carrier is modulated by two modulating waves A and B having modulation indices of 0.6 and 0.8 respectively. The overall modulation index is

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Q. A communication channel disturbed by additive white, Gaussian noise has a bandwidth of 4 kHz and SNR of 15. The highest transmission rate that this channel can support (in k bits/sec) is

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Q. Which of the following microphones is used as a standard for calibration?

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Q. The reactance of coupling capacitor for AC signals in an amplifier, should be

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Q. Assertion (A): In India we use CCIR-B standard

Reason (R): Video signals are frequency modulated.

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Q. CATV stands for

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Q. Household tape recorders use

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Q. A 400 W carrier is modulated to a depth of 75 percent. The total power in modulated wave will be

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Q. A geostationary satellite

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Q. For an ideal 3000 Hz channel, Nyquist rate is

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Q. Assertion (A): Electromagnetic waves in free space spread uniformly in all directions from a point source

Reason (R): Free space has no interference or obstacles.

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Q. In the FM wave described by equation v = 15 sin (4 x 10⁸ t + 3 sin 1100 t), the maximum frequency deviation is

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Q. The radar cross-section of a target depends an

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Q. The Nyquist sampling interval, for the signal sin c (700t) + sin c (5000 t) is

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Q. A line has L = 0.8 µH/m and C = 32 pF/m. Z0 =

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Q. A line has standing waves with a voltage maximum of 35 mV and minimum of 17.5 mV VSWR is

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Q. For a bit rate of 8 kbps, the best possible values of the transmitted frequencies in a coherent binary FSK system are

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