Exam (elaborations)
Engr 217 final.
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Exam of 6 pages for the course EGR 217: Exam at EGR 217: Exam (Engr 217 final.)
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Engr 217 finalHow do you calculate the largest decimal "n" number of bits can output - ANS-largest
decimal = 2^n -1
How does flash type ADC (analog to digital converter) work? and what is an advantage
and disadvantage of it? - ANS-Flash memory makes every comparison simultaneously.
The lowest binary comparator that changes state represents the binary value.
Advantage: Very fast
Disadvantage: Very hardware intensive
How does successive approximation ADC (analog to digital converter) work? What are
the advantages and disadvantages to this method? - ANS-Successive approximation is
similar to the bi-section numerical method. The comparison voltage is set to 1/2 of it's
full scale (FS) voltage and is compared. If the reference is higher, you know the MSB is
0. Otherwise, that bit is a one. Then test half-way the next range. And so forth. Requires
n-1 separate comparisons.
Advantage: very low hardware requirements
Disadvantage: Slower than flash ADC
How does a DAQ work? - ANS-A ladder or resistors and a decoder are used to convert
the digital input to analog.
What is the "Critical Path" in a Project Network Diagram - ANS-The critical path is the
path that takes the longest to complete
What does each variable in the D.C. motor EMF equation repesent?
𝐸 = (𝜙𝑥𝑃𝑥𝑁𝑥𝑍)/(60𝑥A) - ANS-𝜙 = Watts per pole
P = number of generator poles
N = Revolutions per minute
Z = number of armature conductors
, A = number of parallel paths
What are the 7 parts of a D.C. motor and where are they located? - ANS-1. Pole
(located on casing)
2. Filed Winding (attached to the pole)
3. Armature winding (wrapped around the shaft)
4. Armature (Attached on top of armature winding)
5. shaft (located through the middle armature winding)
6. Commutator (attached at the end of the shaft)
7. Brushes (contact the commutator)
What are the 4 materials displayed in Danial Rozin's work (The clicky one) - ANS-Wood,
brass, stainless steal, circuit board
What are the differences between microprocessors and a micro-controller (hardware
and how they are used) - ANS-Physical Structure:
- onboard ROM to hold the program being run
- onboard RAM to hold the program variables
- Buint-in I/O; often specialized such as dedicated ADC, DAC, input/output ports
How they are used:
- designed to allow direct access to read sesors, process information, and they control
some type of actuator
- designed to hold and run only one program
- runs that one program as a loop, continuously, "forever"
- No operating system
- Typically no compiler or interpreter - that is done externally and machine code is
loaded into memory for execution
Arduino Uno R3 parts and purposes:
a. What is the primary intended function of pins 0-13?
b. What is the primary intended function of pins A0-A5?
C. What is the purpose of pins labeled GND, 5V and 3.3V?
D. What does the push button in the upper left hand corner do? - ANS-a. Digital
input/output pins. Used to read and write binary (Boolean) values.
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