Q. A signal m(t) amplitude modulates a carrier Ac cos ωct. The final signal will be

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Q. An oscillator at 4.2 MHz is followed by two frequency doublers and two triplers. The output frequency will be

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Q. Over which frequency range the effect of atmospheric noise is significant?

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Q. In an AM system, doubling of modulation index doubles the antenna current. The system is

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Q. A frequency multiplier stage should operate as

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Q. UHF range is

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Q. A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?

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Q. Which is not purpose of modulation?

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Q. If ω is the frequency of modulating voltage in FM, the modulation index is proportional to

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Q. Which camera tube has gamma of almost unity?

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Q. The baud rate is

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Q. In a tape recorder

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Q. When satellite radio beam is aimed towards earth, it illuminates on the earth for an oval shaped area called

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Q. Chrome signals in PAL colour television system consist of

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Q. In TV system in India, each frame is divided into

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Q. In PAL system

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Q. Among the various modulation systems, the most favoured from the point of linearity of modulation and efficiency is

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Q. The phase of colour subcarrier burst in PAL is along the axis at

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Q. In tape recorder erase head is active during recording.

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Q. Which of the following microphones has maximum distortion?

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