Q. A 100 + j 100 Ω load is to be matched to a line with Z0 = 300 Ω to give SWR = 1. The reactance of stub is

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Q. In VHS format each video head is tilted from azimuth by

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Q. The number of possible colours with a 4 line digital input monitor are

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Q. Convolution of x(t + 5) with impulse function δ(t - 7) is equal to

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Q. Which of the following is a better recording medium?

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Q. An angle modulated signal is given by s(t) = cos 2π (2 x 10⁶t + 30 sin 150t + 40 cos 150t). The maximum frequency and phase deviations of s(t) are

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Q. Microwave link repeaters are typically 50 km apart in TV transmission due to

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Q. Assertion (A): The colour signal consists of only luminance signal

Reason (R): In India PAL colour signal system is used.

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Q. To separate channels in FDM receiver we have to use

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Q. A device with input x(t) and y(t) is characterized by y(t) = x²(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is

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Q. Assertion (A): Bandwidth of a TV signal is 5 MHz.

Reason (R): TV systems use vestigial side band transmission.

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Q. In a satellite system circular polarization is to be obtained. The antenna used is

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Q. A horizontal output stage is cutoff for retrace and 40% of trace. If time for each horizontal line is 64 μs and retrace time is 12 μs, the transistor is conducting for about

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Q. A TV remote control works on the principle of

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Q. As the magnitude of reverse bias is increased, the capacitance of varactor diode

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Q. To prevent overloading in the last IF amplifier one should use

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Q. The number of spectral component when two cosine waves are multiplied of different frequency

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Q. Radiation resistance of an antenna is a

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Q. A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal?

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Q. The input to a coherent detector is DSB - SC signal plus noise. The noise at the detector output is

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