70001. The start of modern computer age was started by the event
70002. At night D layer of ionosphere is absent.
70003. Which of the following is not correct?
70004. Assertion (A): Data communication using digital data must be very accurate.Reason (R): In analog signals redundancy is available but in digital signals redundancy is not available.
70005. What is the RF amplifier plate voltage when the audio-modulating voltage is +600 V?
70006. FM has
70007. The service area of a TV transmitter is a little beyond radio horizon.
70008. If carrier power is P and amplitude modulation index is m, the total power after modulation is
70009. Bit is a unit of
70010. The modulation index of an AM wave is changed from 0 to 1. The transmitted power is
70011. In a radio receiver the input from local oscillator is fed to
70012. A shadow zone does not receive any space wave
70013. A radio frequency signal contains the following three frequencies : 850 kHz; 865 kHz and 875 kHz In order to amplify this signal, which of the following amplifier should be selected?
70014. Which of the following pulse-time modulation is least used?
70015. Transit time is considered as significant at
70016. In a colour TV receiver, AGC adjusts the gain of
70017. In pulse transmitter the ratio of time on to time off is called
70018. In figure the output v(t) is
70019. A MASER is a
70020. Which one of the following is correct?
70021. A balanced modulator circuit uses
70022. In a television camera tube, scanning of a picture is done
70023. In communication receivers the fidelity is provided by
70024. Some features of RF stage in good radio receivers is It increases sensitivity by providing amplification to RF signalIt eliminates image frequency interferenceIt increases selectivityIt reduces noise level Which of the above are true?
70025. During amplitude modulation, the phase angle of the modulating voltage changes by
70026. The image frequency of a superheterodyne receiver is
70027. Image frequency rejection mainly depends upon
70028. Which of the following is most likely to be found in an SSB transmitter?
70029. The maximum life time cumulative dose of Adriamycin chemotherapy is
70030. Which of the following is true as regards telephone systems?
70031. SSB can be generated by
70032. Which one of the following cannot be used to remove the unwanted sideband in SSB?
70033. For FM, which of the following statement is not true?
70034. For TV broadcast, picture signal is modulated in
70035. Assertion (A): Stubs, directional couplers and baluns are very commonly used in communication systemsReason (R): Characteristic impedance of a line is an important parameter.
70036. Audio frequency range lies between
70037. Assertion (A): SSB and ISB receivers have good S/N ratioReason (R): SSB and ISB receivers have good suppression of adjacent channels.
70038. De-emphasis circuit is used
70039. FM broadcast lies in which band?
70040. Which colour picture tube uses slotted aperture mask?
70041. If the circumference of a spherical target is between 1 to 10 wavelength in a radar system, the situation is called
70042. The complete video signal consists of
70043. Which is most important subsystem for recovering and reconstructing signal in a TDM system?
70044. Which one of the following is an indirect way of generating FM?
70045. Companding is used in PCM to
70046. Assertion (A): In AM the amplitude of carrier is made proportional to the instantaneous amplitude of modulating waveReason (R): In AM, frequency of side band = frequency carrier ± frequency of modulating wave.
70047. Pressing a key on telephone set generates two frequencies. The basis for selection of these frequencies is
70048. The orbital period of a geostationary communication satellite is
70049. Which of the following is not true as regards communication receiver?
70050. Which of the following is the disadvantage of PDM and PPM?
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