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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Q. If luminance signal Y = 0.3 R + 0.59 G + 0.11 B, the hue of R - Y colour is

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Q. Trap circuits used in video IF amplifier of colour TV are

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Q. 24 telephone channels, each band limited to 3.4 kHz are to be time division multiplexed using PCM. If sampling frequency is 10 kHz and number of quantization levels is 128, the required bandwidth of PCM is

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Q. Resonant circuits are used in

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Q. Linear diode detector utilizes

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Q. In the equivalent circuit of a moving coil cone type loudspeaker, the mass of the moving system is represented by

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Q. FSK is a system involving

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Q. A 200 Hz sound wave is to be transmitted by a 1000 kHz radio wave using frequency modulation. The instantaneous frequency variation will be

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Q. In a TV studios, flying spot scanner is a device for

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Q. A broadcast radio transmitter radiates 5 kW when the modulation percentage is 60. How much of this is carrier power?

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Q. A device has two resistances 300 Ω and 200 Ω respectively. The noise voltages due to these two resistance calculated separately are 5.38 μV and 4.38 μV respectively. When both of them are used together, the noise voltage will be

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Q. A directional microphone gives an output of 0.5 mV whereas an omnidirectional one gives an output of 0.5 μV in the same position for the same sound pressure. The directivity of the directional microphone is

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Q. If Eb, the energy per bit of a binary digital signal is 10‾⁶ watt sec. and the one sided power spectral density of the white noise N0 = 10‾⁵ W/Hz, then the output SNR of the matched filter is

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