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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. |
Q41 ⇒ The output of a diode detector contains all of the above [other wrong options] [Discuss in forum] D.C. voltage modulating signal RF ripple |
Q42 ⇒ Which of the following is same in AM and FM receivers? IF amplifier [other wrong options] [Discuss in forum] Demodulator AGC All of the above |
Q43 ⇒ In radio receiver, the maximum contribution to noise is from power amplifier [other wrong options] [Discuss in forum] mixer stage power supply equally from above three |
Q44 ⇒ An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is AM-DSB signal with carrier [other wrong options] [Discuss in forum] AM-DSB signal with suppressed carrier AM-SSB signal with carrier a sequence of exponentially decaying sine waves |
Q45 ⇒ In a transistor receiver, the use of FET as the first stage amplifier is likely to reduce the effect of negative peak clipping [other wrong options] [Discuss in forum] improve selectivity of the receiver improve the effectiveness of the AGC reduce the effect of noise at all frequencies |
Q46 ⇒ The passband of the tuned circuits of a radio receiver should be equal to 20 kHz [other wrong options] [Discuss in forum] 455 kHz 1455 kHz more than 455 kHz |
Q47 ⇒ Which of the following noise becomes of great importance at high frequencies? Transit-time noise [other wrong options] [Discuss in forum] Shot noise Flicker noise Agitation noise |
Q48 ⇒ Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver? Variable sensitivity [other wrong options] [Discuss in forum] Variable selectivity Double conversion Squelch |
Q49 ⇒ Neutralization is used in RF amplifiers to stop oscillation [other wrong options] [Discuss in forum] increase bandwidth improve selectivity all of the above |
Q50 ⇒ In a communication system, noise is most likely to affect the signal in the channel [other wrong options] [Discuss in forum] at the transmitter in the information source at the destination |
Q51 ⇒ Padders are used in a receiver to facilitate tracking [other wrong options] [Discuss in forum] discard the carrier filter the input signal suppress noise |
Q52 ⇒ RF amplifiers are used in radio receivers for all of the above [other wrong options] [Discuss in forum] improved image frequency rejection improved rejection of adjacent unwanted signals prevention of re-radiation of the local oscillator through the antenna of the receiver |
Q53 ⇒ If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver All of the above [other wrong options] [Discuss in forum] Unsuitability will occur Heterodyne whistles will be heard Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible |
Q54 ⇒ In a radio receiver with simple AGC an increase in signal strength produces more AGC [other wrong options] [Discuss in forum] the highest AGC voltage is produced between stations the faster the AGC time constant, the more accurate the output the audio stage gain is normally controlled by AGC |
Q55 ⇒ A low ratio of the A.C. load impedance of a diode detector results in negative peak clipping [other wrong options] [Discuss in forum] diagonal clipping poor AGC operation poor AF response |
Q56 ⇒ A transmitter serial current contains radio frequencies [other wrong options] [Discuss in forum] carrier frequencies audio frequencies none of the above |
Q57 ⇒ In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to allow permit adequate frequency coverage without switching [other wrong options] [Discuss in forum] facilitate tracking facilitate image frequency rejection all of the above |
Q58 ⇒ 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 rejection ratio at 25 MHz will be 1.116 [other wrong options] [Discuss in forum] 1.386 2.116 2.386 |
Q59 ⇒ The IF stage of a receiver employs double-tuned transformer coupling [other wrong options] [Discuss in forum] capacitive coupling impedance coupling single-tuned transformer coupling |
Q60 ⇒ Which of the following noise does not occur in transistors? Partition noise [other wrong options] [Discuss in forum] Shot noise Flicker noise Resistance noise |
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