Communication Engineering Mock Test

30 Questions | Total Attempts: 53

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Communication Engineering Mock Test

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Questions and Answers
  • 1. 
    In the Amplitude modulated wave ____________carries the the majority power from the transmitter to the receiver
    • A. 

      Carrier

    • B. 

      USB

    • C. 

      LSB

    • D. 

      Both USB and LSB

  • 2. 
    Degree of modulation depends on---------
    • A. 

      Only amplitude of carrier

    • B. 

      Only amplitude of modulating wave

    • C. 

      Amplitude of both carrier and modulating wave

    • D. 

      Amplitude of both carrier and modulated wave

  • 3. 
    Identify the source of transmission in the case of radio transmission
    • A. 

      Antenna

    • B. 

      Space

    • C. 

      Cable

    • D. 

      Coaxial

  • 4. 
    At which stage the noise is generally developed in the case of radio type receivers?
    • A. 

      IF Stage

    • B. 

      Receiving antenna

    • C. 

      RF stage

    • D. 

      Audio stage

  • 5. 
    Calculate the modulation index if the three modulating signals are having modulation index of 0.6, 0.3, 0.4
    • A. 

      0.871

    • B. 

      0.781

    • C. 

      0.178

    • D. 

      0.117

  • 6. 
    What is the Bandwidth of FM in which the modulating signal is 2 KHZ and the maximum frequency deviation is 12 KHZ. Use Carson's rule.
    • A. 

      26 KHZ

    • B. 

      20 KHZ

    • C. 

      28 KHZ

    • D. 

      30 KHZ

  • 7. 
    Identify the Characteristics of Narrow Band FM
    • A. 

      The frequency sensitivity kf is large and Bandwidth is wide

    • B. 

      The frequency sensitivity kf is small and Bandwidth is narrow

    • C. 

      The frequency  sensitivity kf is large and Bandwidth is narrow

    • D. 

      The frequency sensitivity kf is small and Bandwidth is wide

  • 8. 
    Pick the incorrect choice in the analog communication system
    • A. 

      Radio broadcast

    • B. 

      Frequency division multiplexing

    • C. 

      A/D converter

    • D. 

      Prone to noise

  • 9. 
    In radio transmission, for the height of antenna to be 90m, what should be the modulated signal in AM broadcasting?
    • A. 

      8 MHZ

    • B. 

      80 MHZ

    • C. 

      0.8 MHZ

    • D. 

      30 MHZ

  • 10. 
    Find the bandwidth of the following multitone amplitude modulation system. Given modulating frequencies are 2 kHz and 5 kHz with carrier frequency of 1MHz.
    • A. 

      3 kHz

    • B. 

      7 kHz

    • C. 

      10 kHz

    • D. 

      1005 kHz

  • 11. 
    What is the image frequency for a standard broadcast AM superheterodyne receiver tuned to a station at 700 kHz?
    • A. 

      1610 kHz

    • B. 

      1155 kHz

    • C. 

      245 kHz

    • D. 

      945 kHz

  • 12. 
    Identify the incorrect statement regarding the disadvantage of TRF receiver.
    • A. 

      For entire frequency range large variation in bandwidth

    • B. 

      There is instability since amplifiers tuned to same carrier frequency

    • C. 

      Variations in gains of RF amplifiers

    • D. 

      Not capable of receiving and detecting weak RF signals

  • 13. 
    The total antenna current of an AM transmitter is 10A. If modulation index is 0.8, calculate the carrier current in antenna
    • A. 

      3.2

    • B. 

      4.6

    • C. 

      8.7

    • D. 

      9.5

  • 14. 
    Changing the Characteristics of the sinusoidal Carrier signal with respect to digital input signal is known as 
    • A. 

      Analog modulation

    • B. 

      Encoding

    • C. 

      Digital Modulation

    • D. 

      Demodulation

    • E. 

      None of the above

  • 15. 
    In BPSK , the symbols 1 and 0 are denoted by carrier wave with phase shift of
    • A. 

      π/2

    • B. 

    • C. 

      π

    • D. 

      0

  • 16. 
    The minimum bandwidth to send an information without loss is called
    • A. 

      Trellis Bandwidth

    • B. 

      Nyquist Bandwidth

    • C. 

      Shannon limit

    • D. 

      Huffman Bandwidth

  • 17. 
    The ability of the receiver to select the wanted signals among the various incoming signals is termed as
    • A. 

       Sensitivity

    • B. 

      Selectivity

    • C. 

       Stability

    • D. 

      Fiedility

  • 18. 
    The amount of data transmitted for a given amount of time is called
    • A. 

      Bandwidth

    • B. 

      Frequency

    • C. 

      Noise 

    • D. 

      Signal power

  • 19. 
     Super heterodyne receivers
    • A. 

      Have better sensitivity

    • B. 

      Have high selectivity

    • C. 

      Need extra circuitry for frequency conversion

  • 20. 
     Standard intermediate frequency used for AM receiver is
    • A. 

       455 MHz

    • B. 

      455 KHz

    • C. 

      455 Hz

  • 21. 
     The modulation technique that uses the minimum channel bandwidth and transmitted power is
    • A. 

      FM

    • B. 

      DSB-SC

    • C. 

      VSB

    • D. 

      SSB

  • 22. 
    The total power in an Amplitude Modulated signal if the carrier of an AM transmitter is 800 W and it is modulated 50 percent.
    • A. 

      850 W

    • B. 

      1000.8 KW

    • C. 

      750 W

    • D. 

      900 W

  • 23. 
    A 100MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 50 KHz, calculate the modulation index of the FM signal.
    • A. 

      100

    • B. 

       50

    • C. 

      70

    • D. 

      90

  • 24. 
    FM is disadvantageous over AM signal because
    • A. 

      Much wider channel bandwidth is required

    • B. 

       FM systems are more complex and costlier

    • C. 

      Adjacent channel interference is more

  • 25. 
     FSK reception is
    • A. 

      Phase Coherent

    • B. 

      Phase non coherent

    • C. 

      Phase Coherent & non coherent

    • D. 

      None of the mentioned

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