Skip to content

E
edx-platform
Commit c1c7d3a1 by Lyla Fischer
Options

added basic problem types

parent 3cbb8ed2
Showing with 345 additions and 0 deletions
common/lib/xmodule/xmodule/templates/problem/circuitschematic.yaml 0 → 100644
---
metadata:
display_name: Circuit Schematic
data: |
<!-- Logic gate: cjt 2/13/12 -->
<problem>
<startouttext />
Your goal for this lab is to design a circuit that implements a
<!-- \overline doesn't seem to render correctly -->
3-input logic gate that implements \(Z = \lnot{(C(A+B))}\) where the
\(\lnot\) symbol stands for logical negation. This function is
enumerated in the following truth table:
<center><pre>
C B A | Z
=========
0 0 0 | 1
0 0 1 | 1
0 1 0 | 1
0 1 1 | 1
1 0 0 | 1
1 0 1 | 0
1 1 0 | 0
1 1 1 | 0
</pre></center>
The schematic diagram below includes the resistive pullup for the logic
gate and some voltage sources that serve as the power supply and
generators for the signals that will be the inputs to the gate.
The voltage sources generate the three input signals (A, B and C), timed so that all
possible combinations of the inputs will be generated over a \(4\mu s\)
interval.
<br/><br/>Please add the appropriate pulldown network of mosfet
switches connected to node Z to implement the truth table above, with
\(R_{ON}\) of the mosfets chosen so that \(V_{ol}\) of the logic gate is less than
\(0.25V\) for any combination of inputs. In the schematic tool, the mosfet
model has \(V_{th} = 0.5V\), so \(V_{ol} \lt 0.25V\)
will ensure that when the output of the logic gate is 0, if it is used
as the input to some other logic gate, the mosfet to which
it connects will be off.
<br/><br/>On <A href="/book-shifted/305">page 305</A> of the text we
see from Equation (6) that \(R_{ON} = R_n \frac{L}{W}\). In the
schematic tool, the mosfet model has \(R_n \approx 26.5k\Omega\) when
using a \(3V\) power supply. To adjust \(R_{ON}\), double click the
mosfet and select an appropriate value for the W/L parameter. For
example, setting a mosfet's W/L to 10 would result in \(R_{ON} =
2.65k\Omega\).
<br/><br/>Note that the "Plot offset" property of the scope probes
on the A, B and C signals has been set so that the plots will not
overlap, making it easier to see what's happening.
<br/><br/>Please do not change the voltages of the voltage sources or the
resistance of the pullup resistor.
<endouttext />
<schematicresponse>
<center>
<schematic height="500" width="600" parts="g,n,s" analyses="dc,tran"
submit_analyses="{&quot;tran&quot;:[[&quot;Z&quot;,0.0000004,0.0000009,0.0000014,0.0000019,0.0000024,0.0000029,0.0000034,0.000039]]}"
initial_value="[[&quot;w&quot;,[112,96,128,96]],[&quot;w&quot;,[256,96,240,96]],[&quot;w&quot;,[192,96,240,96]],[&quot;s&quot;,[240,96,0],{&quot;color&quot;:&quot;cyan&quot;,&quot;offset&quot;:&quot;&quot;,&quot;plot offset&quot;:&quot;0&quot;,&quot;_json_&quot;:3},[&quot;Z&quot;]],[&quot;w&quot;,[32,224,192,224]],[&quot;w&quot;,[96,48,192,48]],[&quot;L&quot;,[256,96,3],{&quot;label&quot;:&quot;Z&quot;,&quot;_json_&quot;:6},[&quot;Z&quot;]],[&quot;r&quot;,[192,48,0],{&quot;name&quot;:&quot;Rpullup&quot;,&quot;r&quot;:&quot;10K&quot;,&quot;_json_&quot;:7},[&quot;1&quot;,&quot;Z&quot;]],[&quot;w&quot;,[32,144,32,192]],[&quot;w&quot;,[32,224,32,192]],[&quot;w&quot;,[48,192,32,192]],[&quot;w&quot;,[32,96,32,144]],[&quot;w&quot;,[48,144,32,144]],[&quot;w&quot;,[32,48,32,96]],[&quot;w&quot;,[48,96,32,96]],[&quot;w&quot;,[32,48,48,48]],[&quot;g&quot;,[32,224,0],{&quot;_json_&quot;:16},[&quot;0&quot;]],[&quot;v&quot;,[96,192,1],{&quot;name&quot;:&quot;VC&quot;,&quot;value&quot;:&quot;square(3,0,250K)&quot;,&quot;_json_&quot;:17},[&quot;C&quot;,&quot;0&quot;]],[&quot;v&quot;,[96,144,1],{&quot;name&quot;:&quot;VB&quot;,&quot;value&quot;:&quot;square(3,0,500K)&quot;,&quot;_json_&quot;:18},[&quot;B&quot;,&quot;0&quot;]],[&quot;v&quot;,[96,96,1],{&quot;name&quot;:&quot;VA&quot;,&quot;value&quot;:&quot;square(3,0,1000K)&quot;,&quot;_json_&quot;:19},[&quot;A&quot;,&quot;0&quot;]],[&quot;v&quot;,[96,48,1],{&quot;name&quot;:&quot;Vpwr&quot;,&quot;value&quot;:&quot;dc(3)&quot;,&quot;_json_&quot;:20},[&quot;1&quot;,&quot;0&quot;]],[&quot;L&quot;,[96,96,2],{&quot;label&quot;:&quot;A&quot;,&quot;_json_&quot;:21},[&quot;A&quot;]],[&quot;w&quot;,[96,96,104,96]],[&quot;L&quot;,[96,144,2],{&quot;label&quot;:&quot;B&quot;,&quot;_json_&quot;:23},[&quot;B&quot;]],[&quot;w&quot;,[96,144,104,144]],[&quot;L&quot;,[96,192,2],{&quot;label&quot;:&quot;C&quot;,&quot;_json_&quot;:25},[&quot;C&quot;]],[&quot;w&quot;,[96,192,104,192]],[&quot;w&quot;,[192,96,192,112]],[&quot;s&quot;,[112,96,0],{&quot;color&quot;:&quot;red&quot;,&quot;offset&quot;:&quot;15&quot;,&quot;plot offset&quot;:&quot;0&quot;,&quot;_json_&quot;:28},[&quot;A&quot;]],[&quot;w&quot;,[104,96,112,96]],[&quot;s&quot;,[112,144,0],{&quot;color&quot;:&quot;green&quot;,&quot;offset&quot;:&quot;10&quot;,&quot;plot offset&quot;:&quot;0&quot;,&quot;_json_&quot;:30},[&quot;B&quot;]],[&quot;w&quot;,[104,144,112,144]],[&quot;w&quot;,[128,144,112,144]],[&quot;s&quot;,[112,192,0],{&quot;color&quot;:&quot;blue&quot;,&quot;offset&quot;:&quot;5&quot;,&quot;plot offset&quot;:&quot;0&quot;,&quot;_json_&quot;:33},[&quot;C&quot;]],[&quot;w&quot;,[104,192,112,192]],[&quot;w&quot;,[128,192,112,192]],[&quot;view&quot;,0,0,2,&quot;5&quot;,&quot;10&quot;,&quot;10MEG&quot;,null,&quot;100&quot;,&quot;4us&quot;]]"
/>
</center>
<answer type="loncapa/python">
# for a schematic response, submission[i] is the json representation
# of the diagram and analysis results for the i-th schematic tag
def get_tran(json,signal):
for element in json:
if element[0] == 'transient':
return element[1].get(signal,[])
return []
def get_value(at,output):
for (t,v) in output:
if at == t: return v
return None
output = get_tran(submission[0],'Z')
okay = True
# output should be 1, 1, 1, 1, 1, 0, 0, 0
if get_value(0.0000004,output) &lt; 2.7: okay = False;
if get_value(0.0000009,output) &lt; 2.7: okay = False;
if get_value(0.0000014,output) &lt; 2.7: okay = False;
if get_value(0.0000019,output) &lt; 2.7: okay = False;
if get_value(0.0000024,output) &lt; 2.7: okay = False;
if get_value(0.0000029,output) &gt; 0.25: okay = False;
if get_value(0.0000034,output) &gt; 0.25: okay = False;
if get_value(0.0000039,output) &gt; 0.25: okay = False;
correct = ['correct' if okay else 'incorrect']
</answer>
</schematicresponse>
<startouttext />
When your circuit is ready for testing, run a \(4\mu s\) transient
simulation to verify correct functionality and appropriate \(V_{ol}\)
when the output of the gate is logic 0. To submit, please click
CHECK. The checker will be verifying the voltage of the
output node at several different times, so you'll earn a checkmark
only <i>after</i> you've performed the transient simulation so that
the checker will have a waveform to check!
<br/><br/>Hint: you'll only need 3 mosfet switches to implement the gate.
<br/><br/>When the gate is correctly implemented, the plot produced by the transient
analysis should like similar to the following figure.
<center>
<img src="/static/Lab3_1.png"/>
<br/>Figure 1. Example plot output
</center>
<br/><br/>Food for thought: You'll notice there are little spikes,
sometimes called <i>glitches</i>, in the output waveform (see the
bottom cyan-colored waveform in Figure 1). These only occur when the
A and B inputs are changing simultaneously and the C input is high.
Can you explain why? Think about what is happening in the pulldown
circuitry at the time the glitches occur.
<endouttext />
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/customgrader.yaml 0 → 100644
---
metadata:
display_name: Custom Grader
data: |
<problem>
<text>
<h2>Example: Custom Response Problem</h2>
<p>
A custom response problem accepts one or more lines of text input from the
student, and evaluates the inputs for correctness based on evaluation using a
python script embedded within the problem.
</p>
<script type="loncapa/python">
def test_add(expect,ans):
(a1,a2) = map(float,ans)
return (a1+a2)==10
</script>
<text>
Enter two integers which sum to 10: <br/>
<customresponse cfn="test_add">
<textline size="40" correct_answer="3"/><br/>
<textline size="40" correct_answer="7"/>
</customresponse>
</text>
</text>
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/forumularesponse.yaml 0 → 100644
---
metadata:
display_name: Formula Repsonse
data: |
<problem>
<text>
<h2>Example: Formula Response Problem</h2>
<p>
A formula response problem accepts a line of text input from the
student, and evaluates the input for correctness based on numerical sampling of
the symbolic formula which is given.
</p>
<p>
The answer is correct if it is within a specified numerical tolerance
of the expected answer.
</p>
<p>This kind of response checking can handle symbolic expressions, but places an extra burden
on the problem author to specify the allowed variables in the expression, and the
numerical ranges over which the variables must be sampled to test for correctness.</p>
<script type="loncapa/python">
I = "m*c^2"
</script>
<text>
<br/>
Give an equation for the relativistic energy of an object with mass m. Explicitly indicate multiplication with a <tt>*</tt> symbol.<br/>
</text>
<formularesponse type="cs" samples="m,c@1,2:3,4#10" answer="$I">
<responseparam description="Numerical Tolerance" type="tolerance"
default="0.00001" name="tol" />
<br/><text>E =</text> <textline size="40" math="1" />
</formularesponse>
</text>
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/imageresponse.yaml 0 → 100644
---
metadata:
display_name: Image Response
data: |
<problem>
<text>
<h2>Example: Image Response Problem</h2>
<p>
When teaching conventionally, a common check for understanding is to ask the student to point
at something which satisfies a set of contraints. This use case is captured in the imageresponse.
An image response problem presents an image for the student. Input is
given by the location of mouse clicks on the image. Correctness of input can only be evaluated based on expected dimensions of a rectangle.
</p>
<text>
Click on the cow in this image:
<imageresponse>
<imageinput src="/static/cow.png" width="715" height="511" rectangle="(404,150)-(715,480)" />
</imageresponse>
</text>
</text>
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/multiplechoice.yaml 0 → 100644
---
metadata:
display_name: Multiple Choice
data: |
<problem>
<text>
<h2>Example: Multiple Choice Response Problem</h2>
<p>
A multiple choice response problem presents radio buttons for student
input. <!-->One or more of the choice may be correct.--> Correctness of
input is evaluated based on expected answers specified within each
"choice" stanza.
</p>
<p>Select the correct choice. Grass is:</p>
<multiplechoiceresponse direction="vertical" randomize="yes">
<choicegroup type="MultipleChoice">
<choice location="random" correct="false" name="red">Red</choice>
<choice location="random" correct="true" name="green">Green</choice>
<choice location="random" correct="false" name="yellow">Yellow</choice>
<choice location="bottom" correct="false" name="blue">Blue</choice>
</choicegroup>
</multiplechoiceresponse>
</text>
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/numericalresponse.yaml 0 → 100644
---
metadata:
display_name: Numerical Response
data: |
<problem>
<text>
<h2>Example: Numerical Response Problem</h2>
<p>
A numerical response problem accepts a line of text input from the
student, and evaluates the input for correctness based on its
numerical value.
</p>
<p>
The answer is correct if it is within a specified numerical tolerance
of the expected answer.
</p>
<p>Enter the numerical value of Pi:
<numericalresponse answer="3.14159">
<responseparam type="tolerance" default="5%" name="tol" description="Numerical Tolerance" />
<textline />
</numericalresponse>
</p>
</text>
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/optionresponse.yaml 0 → 100644
---
metadata:
display_name: Option Response
data: |
<problem>
<text>
<h2>Example: Option Response Problem</h2>
<p>
An option response problem presents option boxes for students to select from. Correctness of input is evaluated based
on which option is defined as correct in the optioninput statement.
</p>
<p>Select the correct options:</p>
<optionresponse direction="vertical" randomize="yes">
<p><text class="inline">The location of the sky is: </text><optioninput inline="1" options="('Up','Down')" correct="Up"></optioninput></p>
<p><text>The location of the earth is: </text><optioninput options="('Up','Down')" correct="Down"></optioninput></p>
</optionresponse>
</text>
</problem>
children: []
common/lib/xmodule/xmodule/templates/problem/string_response.yaml 0 → 100644
---
metadata:
display_name: String Response
data: |
<problem >
<text>
<h2>Example: String Response Problem</h2>
<p>
A string response problem accepts a line of text input from the
student, and evaluates the input for correctness based on an expected
answer within each input box.
The answer is correct if it is the expected answer.
</p>
</text>
<span style="display:inline">
<p style="display:inline">Which US state has Lansing as its capital? &#160; &#160;</p>
<stringresponse answer="Michigan" type="ci">
<textline size="20" inline="1"/>
<hintgroup>
<stringhint answer="wisconsin" type="cs" name="wisc">
</stringhint>
<stringhint answer="minnesota" type="cs" name="minn">
</stringhint>
<hintpart on="wisc">
<text>The state capital of Wisconsin is Madison.</text>
</hintpart>
<hintpart on="minn">
<text>The state capital of Minnesota is St. Paul.</text>
</hintpart>
<hintpart on="default">
<text>The state you are looking for is also known as the 'Great Lakes State'</text>
</hintpart>
</hintgroup>
</stringresponse>
</span>
</problem>
children: []
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment