Electronic Engineering: Radio Transmission Test

55 Questions | Total Attempts: 176

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Electronic Engineering: Radio Transmission Test

Radio transmission in simple words is a travel of some kind of information using radio waves. Just like infrared, microwaves, ultraviolet, gamma rays, and x-rays, radio waves are too electromagnetic wave. This quiz primarily focuses on the all the technical terms of a radio transmission and has more than fifty important questions. So, I suggest you to keep a notepad with you in case you need to take some notes.


Questions and Answers
  • 1. 
    An AM broadcast receiver has two identical tuned circuits with a Q prior to the IF stage. The IF frequency is 460 kHz and the receiver is tuned to a station on 550 kHz. The image frequency rejection is?
    • A. 

      41 dB

    • B. 

      82 dB

    • C. 

      36.2 dB

    • D. 

      72.4 dB

  • 2. 
    The acronym CDMA stand for?
    • A. 

      Code division multiple access system

    • B. 

      Carrier division multiple access system

    • C. 

      Capture division multiple access system

    • D. 

      Channel division multiple access system

  • 3. 
    The tuned circuit prior to the mixer in a superheterodyne receiver are called the:
    • A. 

      Front end

    • B. 

      Tuner

    • C. 

      Preselector

    • D. 

      All of the above

  • 4. 
    A certain FM reciever provides a voltage gain of 113 dB prior to its limiter. The limiter's quieting voltage is 400mV, its sensitivity is approximateley:
    • A. 

      2uV

    • B. 

      0.9uV

    • C. 

      1uV

    • D. 

      0.7uV

  • 5. 
    An FM transmitter has an output power of 1000 W when it is not modulated. When intelligence is added, its modulation index is 2.0. What is its output with a modulation index of 2.0?
    • A. 

      500 W

    • B. 

      250 W

    • C. 

      1000 W

    • D. 

      2000 W

  • 6. 
    The simplest Am detector is the:
    • A. 

      Diode detector

    • B. 

      Product detector

    • C. 

      Synchronous detector

    • D. 

      Heterodyne detector

  • 7. 
    Which of the following is the best value for the image frequency rejection ratio (IFRR)?
    • A. 

      70 dB

    • B. 

      50 dB

    • C. 

      40 dB

    • D. 

      60 dB

  • 8. 
    A device that takes the information to be communicated and converts it into an electronic signal compatible with the communication medium is called a:
    • A. 

      Radio transmitter

    • B. 

      Transmission channel

    • C. 

      Radio reciever

    • D. 

      Dynamic range

  • 9. 
    The ability of a receiver to identify and pick the desired signal from other signals present in the frequency spectrum:
    • A. 

      Selectivity

    • B. 

      Dynamic range

    • C. 

      Sensitivity

    • D. 

      Image frequency rejection

  • 10. 
    FM broadcasting uses what type of multiplexing scheme?
    • A. 

      FDM

    • B. 

      Synchronous TDM

    • C. 

      Statistical TDM

    • D. 

      TDM

  • 11. 
    What percent of thee VHF band does the FM broadcast band occupy?
    • A. 

      7.4%

    • B. 

      9.2%

    • C. 

      8.8%

    • D. 

      6.1%

  • 12. 
    A Colpits oscillator uses:
    • A. 

      Tapped capacitor

    • B. 

      Varactor

    • C. 

      Tapped inductor

    • D. 

      Piezoelectric crystal

  • 13. 
    A spectrum analyzer is:
    • A. 

      An instrument that displays amplitude versus frequency on CRT

    • B. 

      Used to determine if a transmitter's output signal is free from any spurious signal

    • C. 

      A radio receiver with broad frequency range

    • D. 

      None of the above

  • 14. 
    The noise figure for an amplifier with noise is:
    • A. 

      0 dB

    • B. 

      Less than 1

    • C. 

      Infinite

    • D. 

      Greater than 1

  • 15. 
    What is the purpose of a buffer amplifier stage in a transmitter ?
    • A. 

      It amplifies audio frequencies before modulation occurs

    • B. 

      It prevents transmitters from producing spurious frequency on CRT

    • C. 

      It provides power amplification with high effieciency

    • D. 

      Its high input impedance prevents oscillators from drifting off frequency

  • 16. 
    The sensitivity of a reciever has to do with its ability to:
    • A. 

      Receive weak stations

    • B. 

      Withstand shock

    • C. 

      Receive one station over another

    • D. 

      All of the above

  • 17. 
    The input signal into a PLL is the:
    • A. 

      Phase detector

    • B. 

      Low pass filter

    • C. 

      VCO

    • D. 

      Comparator

  • 18. 
    Suppose a certain FM signal uses frequency deviation of 100 kHz and a modulating index of 5. Calculate the bandwidth using Carsons rule.
    • A. 

      240 kHz

    • B. 

      230 kHz

    • C. 

      200 kHz

    • D. 

      260 kHz

  • 19. 
    If the frequency fed to the pre - amplifier of a basic transmitter with multipliers is composed of a pair of triplers and a doubler is 198 Mhz, what frequency should the oscillator operate? 
    • A. 

      11 MHz

    • B. 

      16.5 MHz

    • C. 

      30 MHz

    • D. 

      5.5 MHz

  • 20. 
    What is Piezoelectric effect?
    • A. 

      Mechanical vibration of a crystal by the application of voltage

    • B. 

      Mechanical deformation of a crystal by the application of a magnetic field

    • C. 

      The generation of electrical energy by the application of voltage

    • D. 

      Reversed conduction states when pn-junction is exposed to a biased potential

  • 21. 
    A circuit that isolates the carrier oscillator from load changes is called a:
    • A. 

      Linear amplifier

    • B. 

      Final power amplifier

    • C. 

      Buffer amplifier

    • D. 

      Driver amplifier

  • 22. 
    How is a positive feedback coupled to the input in a Hartley oscillator?
    • A. 

      Through a neutralizing capacitor

    • B. 

      Through a capacitive divider

    • C. 

      Through a link coupling

    • D. 

      Through a tapped coil

  • 23. 
    What is the shape factor of a receiver whose 60 dB bandwidth is 12 kHz and a 6 dB bandwidth of 3 kHz?
    • A. 

      4

    • B. 

      2

    • C. 

      0.25

    • D. 

      0.5

  • 24. 
    An AM receiver is tuned to broadcast station 600 kHz. Calculate the image rejection in dB, assuming that the input filter consists of one tuned circuit with a Q of 40:
    • A. 

      29.57 dB

    • B. 

      38.57 dB

    • C. 

      43.57 dB

    • D. 

      34.57 dB

  • 25. 
    An AM superheterodyne receiver is experiencing image channel interference on a frequency of 1570 kHz. What frequency is the receiver tuned to?
    • A. 

      720 kHz

    • B. 

      455 kHz

    • C. 

      600 kHz

    • D. 

      650 kHz