Q. The power density spectrum of noise voltage at the input of a network is Sni and that at the output of the network is Sno. If transfer function of network is H(ω), the corresponding noise figure is

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Q. The modulation index of an AM wave is measured using a CRO. The waveform is as shown in figure, the modulation index is nearly

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Q. On a smooth surface, the line of sight distance between transmitting antenna (height ht metres) and receiving antenna (height hr metres) is about

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Q. Which stage generates RF carrier?

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Q. If F(ω) is Fourier transform of f(t), then Fourier transform of f(t) cos² ωct is

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Q. The circuit of figure give an output which is

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Q. A carrier A cos ωct is modulated by a signal mt A cos ω₁t + m₂ A cos ω₂t + m₃ A cos ω₃t. The total modulated power is

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Q. If an isotropic source is radiating power P in all directions, the electric field at a distance d from the source is proportional to

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Q. Waveform shown in figure is that for

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Q. Which of the following operation are performed on linear queues?

1. Testing a linear queue for underflow
2. Enqueue operation
3. Dequeue operation
4. Testing a linear queue for overflow

Select the correct answer using the codes given below the lists

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Q. The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of

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Q. In FM signal with a modulation index mf is passed through a frequency tripler. The wave in the output of the tripler will have a modulation index of

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Q. In colour TV receiver, varactor diode is used for

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Q. The number of noise sources in a BJT are

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Q. Energy content of atmospheric noise

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Q. As the frequency increases, the absorption of ground wave by earth's surface

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Q. The velocity of sound waves in air

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Q. The range of a cordless telephone is about

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Q. An earth mat for a communication tower consists of

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Q. Degaussing in a picture tube means

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