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MODD / Mr. Hansen |
Name:
_________________________ |
Test on Unit 0x10 (Topics 0x11-0x1F, omitting 0x1C)
Time limit: 32 minutes (48 minutes for extended
time). A calculator is permitted but is probably not required.
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1. |
Add in hex: CAB + ADD. Show
your work. |
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2. |
Explain why 408 is not an
octal number. Use the word radix in
your answer. |
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3. |
ASCII stands for __________________________________________________________
. There are _____ different ASCII characters possible, each of which is
represented by 2 hex digits (i.e., one _________ of data). |
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4. |
How many nybbles are in a dword? Show
your work. |
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5. |
Who was Mark Zbikowski? |
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6. |
AM radio stations are licensed at frequencies such as
600 KHz, 610 KHz, 620 KHz, etc. Compute the bandwidth in MHz. |
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7. |
FM radio stations are
licensed at frequencies such as 89.9 MHz, 90.1 MHz, 90.3 MHz, 90.5 MHz, etc.
If stereo CD-quality sound requires a bit rate of 162 kbps, could FM radio
(theoretically) be used to transmit music of this type in digital format?
Justify your answer. |
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8. |
In round numbers (not produced on a calculator), how many different
possibilities could be represented by a 40-bit binary number? Express your answer
first as a power of 2, then as a power of 10. |
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9. |
I have a 56 kbps modem that
I wish to use for transmitting digitized music at low fidelity (8 kbps per
channel). |
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(a) |
Is it possible for me to transmit
more than one channel using my modem? ___________ |
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(b) |
If so, how many channels
could I transmit in real time (i.e., streaming)? __________ |
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(c) |
Write a sentence or two describing the process of multiple-channel
transmission and reception, using the vocabulary words we learned (_____ing and de-____ing). |
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(d) |
Approximately how long will
it take to transmit a 1.5 MB data file with my modem if I devote all channels
to that purpose? (Show work.) |
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Point values: 2. 10 3. 10 4. 8 5. 5 6. 6 7. 10 8. 8 9.(a) 3 (c) 6 (d) 10 |