14.1 Digital Technology

10 Questions | By Gboulton | Last updated: Oct 19, 2020 | Total Attempts: 184

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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.