MCQ Quiz: Data Communication! Test

26 Questions | Attempts: 436
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MCQ Quiz: Data Communication! Test - Quiz

Think you are an expert in digital communication? Can you pass this quiz? Data communication is the transmission of digital data between two or more computers and a computer network. It is a network that allows computers to exchange information. The physical connection between networked computing devices is established using either cable media or wireless media. Computer systems are connected to form a network. This quiz will explain all the variables of data communication.


Questions and Answers
  • 1. 
    Sampling is process to convert _________ to ____________
    • A. 

      Analog signal to digital signal

    • B. 

      Continous time signal to discrete time signal

    • C. 

      Signal to message

    • D. 

      None of the above

  • 2. 
    If even parity is being used then the value of parity bit should be ______ for data sequence 101010.
    • A. 

      1

    • B. 

      0

    • C. 

      2

    • D. 

      3

  • 3. 
    Asynchronous transmission is ________ efficient as compared to synchronous transmission.
    • A. 

      More

    • B. 

      Equally

    • C. 

      Less

    • D. 

      None

  • 4. 
    CRC code is ____________ technique.
    • A. 

      Error detection

    • B. 

      Error correction

    • C. 

      Flow control

    • D. 

      Encryption

  • 5. 
    Consider data word 1110 is to transmitted using CRC code and if the pattern P= 1101 then how many redundant bits will be added to data word to make code word?
    • A. 

      Three

    • B. 

      Four

    • C. 

      Two

    • D. 

      One

  • 6. 
    If the generator polynomial is X^4 + X^3 + 1 then the corresponding binary pattern will be:
    • A. 

      11001

    • B. 

      11010

    • C. 

      10011

    • D. 

      110

  • 7. 
    The signal-to-noise ratio (in dB) for n-bit PCM can be expressed as:
    • A. 

      6.02n + 1.76

    • B. 

      20log 2 + 1.76

    • C. 

      1.76n + 6.02

    • D. 

      20nlog 2 + 1.76

  • 8. 
    The ratio of data rate R, to transmission bandwidth is referred to as the:
    • A. 

      Baud Rate

    • B. 

      Bandwidth efficiency

    • C. 

      Signal efficiency

    • D. 

      Bit Rate Efficiency

  • 9. 
    In asynchronous transmission, assume that data rate 10 kbps & the receiver clock is fast by 6%, then the receiver samples the incoming character at every:
    • A. 

      100 micro seconds

    • B. 

      47 micro seconds

    • C. 

      94 micro seconds

    • D. 

      50 micro seconds

  • 10. 
    If R is the bit rate and r is related to the technique by which the signal is filtered to establish a bandwidth for transmission, then transmission bandwidth for ASK is equal to:
    • A. 

      (1+ r)R

    • B. 

      (1+ r)/R

    • C. 

      (1+ R)r

    • D. 

      (1+ R)/r

  • 11. 
    The ________ between two words is the number of differences between corresponding bits.
    • A. 

      HAMMING RULE

    • B. 

      HAMMING DISTANCE HAMMING DISTANCE

    • C. 

      HAMMING CODE

    • D. 

      NONE OF THE ABOVE

  • 12. 
    In block coding, we divide our message into blocks, is called
    • A. 

      CODEWORDS

    • B. 

      ERROR CODES

    • C. 

      PACKET BLOCKS

    • D. 

      DATAWORDS

  • 13. 
    Find parity bit for 1001011.
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      0

  • 14. 
    Which error detection method consists of just one redundant bit per data unit?
    • A. 

      CRC

    • B. 

      CheckSum

    • C. 

      Simple Parity

    • D. 

      Hamming Distance

  • 15. 
    In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant.
    • A. 

      PSK

    • B. 

      ASK

    • C. 

      FSK

    • D. 

      QAM

  • 16. 
    _______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.
    • A. 

      Analog-to-analog

    • B. 

      Digital-to-digital

    • C. 

      Digital-to-Analog

    • D. 

      None of these

  • 17. 
    In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.
    • A. 

      PSK

    • B. 

      ASK

    • C. 

      FSK

    • D. 

      QAM

  • 18. 
    ASK, PSK, FSK, and QAM are examples of ________ conversion.
    • A. 

      Analog-to-analog

    • B. 

      Digital-to-digital

    • C. 

      Analog-to-digital

    • D. 

      Digital-to-analog

  • 19. 
     If the value of checksum is 0, then the message is:  
    • A. 

      Accepted

    • B. 

      Rejected

    • C. 

      Sendback

    • D. 

      None of these

  • 20. 
    If the generator of cyclic code has at least two terms and rightmost bit is 1 then error cannot be divided by:
    • A. 

      Syndrome

    • B. 

      Error

    • C. 

      Dataword

    • D. 

      Generator

  • 21. 
    In bit pattern, shifting to right means:
    • A. 

      Adding extra 0s as rightmost bits

    • B. 

      Deleting some rightmost bits

    • C. 

      Adding extra 1s as rightmost bits

    • D. 

      Deleting some leftmost bits

  • 22. 
    The _______ of a polynomial is the highest power in the polynomial.  
    • A. 

      Range

    • B. 

      Power

    • C. 

      Degree

    • D. 

      None

  • 23. 
    In cyclic redundancy checking, the divisor is _______ the CRC. 
    • A. 

      The same size as

    • B. 

      One bit less than one bit less than one bit less than one bit less than one bit less than

    • C. 

      One bit more than

    • D. 

      None

  • 24. 
    In cyclic redundancy checking, what is the CRC?
    • A. 

      The divisor The Divisor

    • B. 

      The Dividend

    • C. 

      The Reminder

    • D. 

      The Quotient

  • 25. 
    Which can detect two-bit errors?
    • A. 

      Parity check

    • B. 

      Parity & Cyclic redundancy check

    • C. 

      Cyclic redundancy check

    • D. 

      None of the mentioned

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