14.1 Digital Technology

10 Questions | Total Attempts: 184

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14.1 Digital Technology

Digitgal technology - binary numbers - AD conversions,


Questions and Answers
  • 1. 
    Wrtie 22 as a 5bit binary word.
    • A. 

      11100

    • B. 

      11010

    • C. 

      10110

    • D. 

      11011

    • E. 

      01010

  • 2. 
    In this base ten number, "123456" which is the least significant bit?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      5

    • F. 

      6

  • 3. 
    What is 00111 as a base ten number
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      5

    • F. 

      6

    • G. 

      7

    • H. 

      8

    • I. 

      9

  • 4. 
    What should be done to increase the quality of a digitized signal  if the higher frequencies are missing?
    • A. 

      Increase gain

    • B. 

      Decrease gain

    • C. 

      Amplify signal

    • D. 

      Increase sampling rate

    • E. 

      Decrease sample rate

  • 5. 
    What disadvantage is there to improving the quality of the digitzed signal (in the method in the previous question)?
    • A. 

      It takes longer to record signal

    • B. 

      It takes more space to store file

    • C. 

      There is no real disadvantage

    • D. 

      You will get too used to good quality music

  • 6. 
    Which of the following terms can be used to describe an analogue signal. I is continuous signal II has discrete values in the signal III varies between two extreme values IV signal varies depending on the physical mechanism that created the signal V is quantized.
    • A. 

      I & II & III & IV

    • B. 

      I & III & IV & V

    • C. 

      I & III & IV

    • D. 

      II & III & IV

    • E. 

      III & IV & V

  • 7. 
    The height of the bump on a CD is 100nm.  What is the wavelength of light that is used to read the CD
    • A. 

      100nm

    • B. 

      200nm

    • C. 

      300nm

    • D. 

      400nm

    • E. 

      600nm

    • F. 

      800nm

  • 8. 
    Which two properties of light are needed to read the information on a CD? reflection refraction interference diffraction polarization
    • A. 

      Reflection and refraction

    • B. 

      Reflection and diffraction

    • C. 

      Reflection and interference

    • D. 

      Refraction and interference

    • E. 

      Polarization and reflection

    • F. 

      Refraction and polarization

  • 9. 
    An analogue signal is sampled at time intervals t.  Each sample is converted to a digital number having n bits. What is the total number of bits produced in a time T ?
    • A. 

      NT/t

    • B. 

      Nt/T

    • C. 

      NtT

    • D. 

      N/Tt

  • 10. 
    What areas of difficulty have you had with this topic?  Take note, there are many questions similar to question 9 on paper 2 of the exam.