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Home⇒ Engineering⇒
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. |
Q1 ⇒ Modulated carrier power in FM is independent of the modulating signal power [other wrong options] [Discuss in forum] increases with modulating signal power decreases with modulating signal power none |
Q2 ⇒ The sensitivity of a superheterodyne receiver is determined by all of the above [other wrong options] [Discuss in forum] the gain IF amplifier the gain of RF amplifier the noise figure |
Q3 ⇒ In a superheterodyne receiver, the IF stage has better selectivity than RF stage because of constant passband [other wrong options] [Discuss in forum] of higher frequency of lower frequency of high L/C ratio |
Q4 ⇒ Three point tracking can be achieved with variable selectivity [other wrong options] [Discuss in forum] gang condenser paddar capacitor any of the above |
Q5 ⇒ Which of the following produces upper and lower side frequencies? Microphone [other wrong options] [Discuss in forum] Demodulator in a superheterodyne receiver Modulator in a. radio transmitter Oscillator in a receiver |
Q6 ⇒ The problem associated with tuned-radio frequency receiver is all of the above [other wrong options] [Discuss in forum] instability insufficient adjacent frequency rejection bandwidth variation |
Q7 ⇒ In a superheterodyne receiver the IF stage has better selectivity than RF stage [other wrong options] [Discuss in forum] the RF stage has better selectivity than IF stage the RF stage has same selectivity than IF stage none of the above |
Q8 ⇒ Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz 30, 60 and 70 MHz [other wrong options] [Discuss in forum] 30, 60 and 70 kHz 3, 6 and 7 kHz 3, 6 and 7 GHz |
Q9 ⇒ In a radio receiver, if the intermediate frequency is too low Selectivity will be too sharp [other wrong options] [Discuss in forum] Image-frequency rejection will improve The frequency selectivity of the local oscillator will have to be lowered All of the above |
Q10 ⇒ Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver? Ganged tuning inductor [other wrong options] [Discuss in forum] Variable tuning inductor Variable capacitor Variable preset |
Q11 ⇒ Which of the following statement about the amplitude limiter is not valid? The circuit is always biased in class C, by virtue of the leak type bias [other wrong options] [Discuss in forum] Leak type bias must be used Output must be tuned When the input increases past the threshold of limiting, the gain decreases to keep the output constant |
Q12 ⇒ A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is 236 [other wrong options] [Discuss in forum] 5870 3655 13.3 |
Q13 ⇒ The image frequency of a superheterodyne receiver is typical to FM receivers only [other wrong options] [Discuss in forum] independent of the frequency at which the receiver is tuned always outside the operating range of the receiver not rejected by the IF tuned circuits |
Q14 ⇒ A receiver having poor IF selectivity will also have poor blocking [other wrong options] [Discuss in forum] sensitivity double spotting all of the above |
Q15 ⇒ In an FM signal, the power remains constant when the modulation index increases [other wrong options] [Discuss in forum] increases as the modulation index increases reduces as the modulation index increase increases as the modulation index decreases |
Q16 ⇒ Which of the following circuit cannot be used to demodulate SSB? Phase discriminator [other wrong options] [Discuss in forum] Produce detector Balanced modulator Beat frequency oscillator |
Q17 ⇒ The noise generated by a resistor depends upon its operating temperature [other wrong options] [Discuss in forum] its resistance value both its resistance value and operating temperature none of the above |
Q18 ⇒ The sensitivity curve of a standard receiver is represente curve C [other wrong options] [Discuss in forum] curve A curve B curve D |
Q19 ⇒ Which of the following cannot be used to demodulate SSB? Bipolar transistor balanced modulator [other wrong options] [Discuss in forum] Complete phase-shift generator Product detector Diode balanced modulator |
Q20 ⇒ As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers? High gain and better sensitivity [other wrong options] [Discuss in forum] Better selectivity at high frequencies Stability Noise suppression |
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