Q. Some features of RF stage in good radio receivers is

1. It increases sensitivity by providing amplification to RF signal
2. It eliminates image frequency interference
3. It increases selectivity
4. It reduces noise level

Which of the above are true?

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Q. During amplitude modulation, the phase angle of the modulating voltage changes by

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Q. The image frequency of a superheterodyne receiver is

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Q. Image frequency rejection mainly depends upon

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Q. Which of the following is most likely to be found in an SSB transmitter?

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Q. Which one of the following frequency bands is allocated by ITU (International Telecomm. Union) for DBS - (Direct Broadcast service) also referred as DTH - (Direct to Home service)?

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Q. FM broadcast lies in which band?

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Q. Which colour picture tube uses slotted aperture mask?

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Q. If the circumference of a spherical target is between 1 to 10 wavelength in a radar system, the situation is called

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Q. The complete video signal consists of

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Q. Transit time is considered as significant at

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Q. In a colour TV receiver, AGC adjusts the gain of

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Q. In pulse transmitter the ratio of time on to time off is called

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Q. A MASER is a

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Q. Which one of the following is correct?

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Q. A paraboloid reflector has mouth diameter D meters, wavelength λ meters. Its beam width φ is equal to

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Q. A balanced modulator circuit uses

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Q. In a television camera tube, scanning of a picture is done

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Q. In communication receivers the fidelity is provided by

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Q. A signal having uniformly distributed amplitude in the interval (- V to + V) is to be encoded using PCM with uniform quantization. The signal to quantization noise ratio is determined by

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