Transcript Jeopardy

Jeopardy
Transducers
(general)
Practical
Applications of
Strain Gauges
Properties of Strain
Characteristics of
Stress, Strain,
Gauges and how Young’s Modulus Stress-Strain Curves
they work
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Q $500
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Q $500
Final Jeopardy
Teams
1: Aaron, Tyran, Darius
2: Alex, Jordan, Tiffany
3: Lia, Wade, Tim
$100 Question from H1
How are transducers classified?
$100 Answer from H1
By the energy that it senses/comes in
$200 Question from H1
Can an energy convertor be a transducer?
$200 Answer from H1
Yes
$300 Question from H1
What is the difference between
an analog and digital
transducer?
$300 Answer from H1
The analog shows readings on a meter
basically and digital shows readings in
number form.
$400 Question from H1
Explain why all
transducers are not
sensors?
$400 Answer from H1
A sensor is something that
produces a readable signal output.
A sensor is made of transducer(s)
BUT transducers can be used and
not produce a readable output
signal.
$500 Question from H1
What are two properties that differentiate a transducer
from an energy convertor?
$500 Answer from H1
Transducers take in only a small
amount of energy AND
transducers produce an output
signal
$100 Question from H2
What is the name of the circuit we used with the
strain gauge in one of our labs?
$100 Answer from H2
Wheatstone bridge
$200 Question from H2
Who was the inventor of the
strain gauge?
$200 Answer from H2
Arthur Claude Ruge
$300 Question from H2
What are the 6 practical
uses for strain gauges?
$300 Answer from H2
Sensing airplane wing deflection, bridge
deflection, rail deflection, aerodynamics,
auto classification, and dynos
$400 Question from H2
How many sensors does the
Tsing Ma Bridge have?
$400 Answer from H2
350 sensors
$500 Question from H2
Where is a dyno connected to?
$500 Answer from H2
A flywheel or crankshaft
$100 Question from H3
What is the formula for stress and strain?
$100 Answer from H3
Stress= F/A
Strain= ∆L/L
$200 Question from H3
Who invented the strain gauge?
$200 Answer from H3
Arthur C. Ruge
$300 Question from H3
A strain gauge relies on
a change in ___ in
order to create a change
in voltage which is
used to provide a stress
reading.
$300 Answer from H3
Resistance
$400 Question from H3
When a material receives a tensile
force F it has a stress that corresponds
to the applied force. In proportion to the stress
the cross-section of the strain gauge wire contracts and the
length elongates
by ∆L from the length material had before
receiving the tensile force. This is a description of what
property?
$400 Answer from H3
E: Elastic Modulus (YM Modulus)
$500 Question from H3
Name 3 types of strain gauges.
$500 Answer from H3
1. Foil Strain Gauge
2. Wire Strain Gauge
3. Semi-Conductor Strain Gauge
$100 Question from H4
What is the formula for Young’s
Modulus?
$100 Answer from H4
YM= Stress/Strain
$200 Question from H4
Force is to stress as __________
is to strain
$200 Answer from H4
Deformation
$300 Question from H4
What are the two variables
needed to calculate Young’s
Modulus? What are the two
formulas needed to get these
variables?
$300 Answer from H4
Stress & Strain.
Stress=F/A
Strain= L/L
$400 Question from H4
What is the Young’s Modulus equation?
Briefly describe what you would use
the Young’s Modulus equation for.
$400 Answer from H4
Y.M.=Stress/Stain
Can be used to determine the
Hardness/Elasticity of a material or object.
$500 Question from H4
A power line is stretched as it strung across two telephone poles.
The lines length before stretching is 50 feet after stretching is 60 feet.
The diameter of the line is 1 inch.
The force being applied to the line under wind is 200 pounds.
Calculate the stress AND the strain applied to the line. Then using your
stress and strain values, calculate the Y.M value.
(Calculate Pi as 3.14)
$500 Answer from H4
Strain=.2
Stress=0.42lb/in2
Y.M.=2.1lb/in2
$100 Question from H5
Name the point where the
material involved can no
longer return to it’s original
shape?
$100 Answer from H5
Elastic Limit
$200 Question from H5
Name the point at
which a material can
stretch no further?
$200 Answer from H5
Failure Point
$300 Question from H5
Describe the difference
between elastic limit and
the yield point?
$300 Answer from H5
At the yield point a material begins to
“Give Way” to a force, at the elastic
limit the material has stretched too far
for it to return back to it’s original
shape.
$400 Question from H5
A Y.M. graph has a slope of 1/6
At an X(Strain) value of .75
find the Y(Stress) value.
$400 Answer from H5
.125
$500 Question from H5
Find the slope of a Y.M graph using the following variables:
Stress1=50lb/in2
Stress2=600lb/in2
Strain1=.0123
Strain2=.0173
$500 Answer from H5
Slope=550/.005
2
= 110000lb/in
Final Jeopardy
What would have a greater
Y.M. graph slope.
Reinforced concrete
Or
A bar of aluminum?
Final Jeopardy Answer
Reinforced Concrete