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Radio receivers
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Noise generated in a resistor is also known as thermal noise [other wrong options] [Discuss in forum] partition noise white noise shot noise |
Q22 ⇒ Which one of the following is not a useful quantity for comparing the noise performance of receivers? Input noise voltage [other wrong options] [Discuss in forum] Noise figure Noise temperature Equivalent noise resistance |
Q23 ⇒ In a FM waveform, the side bands are spaced at intervals equal to half the modulating frequency [other wrong options] [Discuss in forum] four times the modulating frequency twice the modulating frequency modulating frequency |
Q24 ⇒ Vividh Bharati programme is transmitted in medium frequency [other wrong options] [Discuss in forum] short wave very high frequency all of the above |
Q25 ⇒ The source of which of the following noise is different from that of the remaining? Atmospheric noise [other wrong options] [Discuss in forum] Solar noise Cosmic noise Galactic noise |
Q26 ⇒ RF amplifiers are used in radio receivers for all of the above [other wrong options] [Discuss in forum] better sensitivity improved signal-to-noise ratio better coupling of receiver to the antenna |
Q27 ⇒ In a receiver, at higher frequencies tracking will be improved [other wrong options] [Discuss in forum] tracking will be poor selectivity will be poor image frequency rejection will be poor |
Q28 ⇒ In a broadcast superheterodyne receiver mixer input must be tuned to the signal frequency [other wrong options] [Discuss in forum] the local oscillator operates below the signal frequency local oscillator frequency is normally double the IF RF amplifier normally works at kHz above the carrier frequency |
Q29 ⇒ In a receiver, which of the following device has IF input but RF output? Demodulator [other wrong options] [Discuss in forum] Loudspeaker Audio amplifier Frequency changer |
Q30 ⇒ In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be 2110 kHz [other wrong options] [Discuss in forum] 1655 kHz 745 kHz 910 kHz |
Q31 ⇒ Which of the following oscillator is generally not used at VHF? Armstrong oscillator [other wrong options] [Discuss in forum] Colpitts oscillator Clapp oscillator Ultra Audio oscillator |
Q32 ⇒ Which of the following statement about receivers is false? Variable sensitivity is used to eliminate selective fading [other wrong options] [Discuss in forum] Double conversion is used to improve image rejection Double conversion is used to improve selectivity Variable sensitivity is used to improve selectivity |
Q33 ⇒ Which curve represents the fidelity curve of a standard recei Curve C [other wrong options] [Discuss in forum] Curve A Curve B Curve D |
Q34 ⇒ In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be 1910 kHz [other wrong options] [Discuss in forum] 1010 kHz 1455 kHz 545 kHz |
Q35 ⇒ Double spotting in a receiver is due to inadequate image frequency rejection [other wrong options] [Discuss in forum] poor sensitivity of RF amplifier high gain of IF amplifier all of the above |
Q36 ⇒ Fidelity of a receiver represents the variation of the output with the modulation frequency when the output impedance is a resistance [other wrong options] [Discuss in forum] the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies none of the above |
Q37 ⇒ Most of the amplification of the received signal is obtained in a superheterodyne receiver from the IF stage [other wrong options] [Discuss in forum] RF stage power amplification stage none of the above |
Q38 ⇒ A heterodyne frequency changer is called a Mixer [other wrong options] [Discuss in forum] Modulator Demodulator Frequency translator |
Q39 ⇒ Standard AM radio broadcasts are confined to MF [other wrong options] [Discuss in forum] HF VHF UHF |
Q40 ⇒ In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is 2100 kHz [other wrong options] [Discuss in forum] 750 kHz 990 kHz 1650 kHz |
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