logo

CuriousTab

CuriousTab

Discussion

Home ‣ Electronics and Communication Engineering ‣ Radio Receivers Comments
  • Question

  • Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?


  • Options
  • A. Variable selectivity
  • B. Variable sensitivity
  • C. Double conversion
  • D. Squelch

  • Correct Answer
  • Variable sensitivity 

    • Radio Receivers problems

    Search Results

    • 1. RF amplifiers are used in radio receivers for

    • Options
    • A. improved image frequency rejection
    • B. improved rejection of adjacent unwanted signals
    • C. prevention of re-radiation of the local oscillator through the antenna of the receiver
    • D. all of the above
      • Discuss
    • 2. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is

    • Options
    • A. 114 kW
    • B. 336 kW
    • C. 384 kW
    • D. 455 kW
      • Discuss
    • 3. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

    • Options
    • A. 750 kHz
    • B. 990 kHz
    • C. 1650 kHz
    • D. 2100 kHz
      • Discuss
    • 4. The sensitivity curve of a standard receiver is represented by

    • Options
    • A. curve A
    • B. curve B
    • C. curve C
    • D. curve D
      • Discuss
    • 5. A duplexer is a device used to

    • Options
    • A. feed more than one receiver from a single antenna
    • B. connect two transmitters to the same antenna
    • C. connect a receiver and a transmitter to the same antenna
    • D. none of these
      • Discuss
    • 6. The output of a diode detector contains

    • Options
    • A. D.C. voltage
    • B. modulating signal
    • C. RF ripple
    • D. all of the above
      • Discuss
    • 7. A heterodyne frequency changer is called a

    • Options
    • A. Modulator
    • B. Mixer
    • C. Demodulator
    • D. Frequency translator
      • Discuss
    • 8. Modulated carrier power in FM

    • Options
    • A. increases with modulating signal power
    • B. decreases with modulating signal power
    • C. is independent of the modulating signal power
    • D. none
      • Discuss
    • 9. When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is given by

    • Options
    • A. fsi = fs - 2fi
    • B. fsi = fs + 2fi
    • C.
    • D.
      • Discuss
    • 10. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?

    • Options
    • A. High gain and better sensitivity
    • B. Better selectivity at high frequencies
    • C. Stability
    • D. Noise suppression
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.