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<h2 class="hd hd-2 unit-title">Review of Concepts: Valve Safety</h2>
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<h2>7.6.1 Review of Concepts: Valve Safety</h2>
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Describe the traditional approach to component reliability and explain the difference between 'reliability' and 'safety'" type="button" id="LD">MO 7.1</button></p>
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Component Redundancy
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<legend id="0beaace0830747d38a2d3d50b785e0a5_2_1-legend" class="response-fieldset-legend field-group-hd">Valves can fail open or fail closed. Having two valves in parallel reduces the probability of which situation?</legend>
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<input type="radio" name="input_0beaace0830747d38a2d3d50b785e0a5_2_1" id="input_0beaace0830747d38a2d3d50b785e0a5_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="0beaace0830747d38a2d3d50b785e0a5_2_1-choice_1-label" for="input_0beaace0830747d38a2d3d50b785e0a5_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_0beaace0830747d38a2d3d50b785e0a5_2_1"> Entire system fails closed
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<h2 class="hd hd-2 unit-title">Review of Concepts: Safety and Reliability</h2>
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<h2>7.6.2 Review of Concepts: Safety and Reliability</h2>
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Describe the traditional approach to component reliability and explain the difference between 'reliability' and 'safety'" type="button" id="LD">MO 7.1</button></p>
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Safety Vs. Reliability
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<p>Put the following into one of the four categories:</p>
<p>Category 1 - Safe and Reliable</p>
<p>Category 2 - Reliable but Unsafe</p>
<p>Category 3 - Unreliable but Safe</p>
<p>Category 4 - Unreliable and Unsafe</p>
<p>You will receive 1 point for each correct answer.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="inputtype option-input ">
<label class="problem-group-label" for="input_b701ff7a0f104a00ab44cf7bd8c53bdc_2_1" id="label_b701ff7a0f104a00ab44cf7bd8c53bdc_2_1">Carbon monoxide sensor does not work properly. Category?</label>
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<option value="Category 1"> Category 1</option>
<option value="Category 2"> Category 2</option>
<option value="Category 3"> Category 3</option>
<option value="Category 4"> Category 4</option>
</select>
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<span id="solution_b701ff7a0f104a00ab44cf7bd8c53bdc_solution_1"/>
</div><div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><div class="inputtype option-input ">
<label class="problem-group-label" for="input_b701ff7a0f104a00ab44cf7bd8c53bdc_3_1" id="label_b701ff7a0f104a00ab44cf7bd8c53bdc_3_1">Automatic Speed Control system in a car fails to engage. Category?</label>
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<option value="option_b701ff7a0f104a00ab44cf7bd8c53bdc_3_1_dummy_default">Select an option</option>
<option value="Category 1"> Category 1</option>
<option value="Category 2"> Category 2</option>
<option value="Category 3"> Category 3</option>
<option value="Category 4"> Category 4</option>
</select>
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<p class="answer" id="answer_b701ff7a0f104a00ab44cf7bd8c53bdc_3_1"/>
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<span id="solution_b701ff7a0f104a00ab44cf7bd8c53bdc_solution_2"/>
</div><div class="wrapper-problem-response" tabindex="-1" aria-label="Question 3" role="group"><div class="inputtype option-input ">
<label class="problem-group-label" for="input_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1" id="label_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1">Normal operation of a nuclear reactor. Category?</label>
<select name="input_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1" id="input_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1" aria-describedby="status_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1">
<option value="option_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1_dummy_default">Select an option</option>
<option value="Category 1"> Category 1</option>
<option value="Category 2"> Category 2</option>
<option value="Category 3"> Category 3</option>
<option value="Category 4"> Category 4</option>
</select>
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<span class="status unanswered" id="status_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
<p class="answer" id="answer_b701ff7a0f104a00ab44cf7bd8c53bdc_4_1"/>
</div></div>
<div class="solution-span">
<span id="solution_b701ff7a0f104a00ab44cf7bd8c53bdc_solution_3"/>
</div><div class="wrapper-problem-response" tabindex="-1" aria-label="Question 4" role="group"><div class="inputtype option-input ">
<label class="problem-group-label" for="input_b701ff7a0f104a00ab44cf7bd8c53bdc_5_1" id="label_b701ff7a0f104a00ab44cf7bd8c53bdc_5_1">Firearm whose safety lock fails (this question is about the firearm itself). Category?</label>
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<option value="option_b701ff7a0f104a00ab44cf7bd8c53bdc_5_1_dummy_default">Select an option</option>
<option value="Category 1"> Category 1</option>
<option value="Category 2"> Category 2</option>
<option value="Category 3"> Category 3</option>
<option value="Category 4"> Category 4</option>
</select>
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<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
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<p class="answer" id="answer_b701ff7a0f104a00ab44cf7bd8c53bdc_5_1"/>
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<h2 class="hd hd-2 unit-title">Review of Concepts: Software Safety</h2>
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<h2>7.6.3 Review of Concepts: Software Safety</h2>
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<h3 class="hd hd-3 problem-header" id="ecdaf5cad0134dba9769e1295a122950-problem-title" aria-describedby="block-v1:MITx+16.00x+2T2019+type@problem+block@ecdaf5cad0134dba9769e1295a122950-problem-progress" tabindex="-1">
Software
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<p>Which of the following are true?</p>
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<text>a) It is impossible to test all the branches of an "intelligent" computer program.</text>
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<text>b) Software never fails. It does exactly what it has been coded to do.</text>
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<text>c) Software specifications are often inadequate to cover all operational situations.</text>
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<text>d) Accidents can be caused if humans do not understand the mode in which an automated system is operating.</text>
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