# Total Quality Management Questions and Answers – Reliability

This set of Total Quality Management Multiple Choice Questions & Answers (MCQs) focuses on “Reliability”.

1. Reliability is a measure of how quality changes over time.
a) True
b) False

Explanation: Reliability is a measure of how quality changes over time. Quality shows us how well the product or service performs its intended function, but reliability shows how well the product or service retain its original level of quality over a period of time.

2. Reliability is the probability of a system or service to perform its intended function satisfactorily over a specific period of time under specific conditions.
a) True
b) False

Explanation: Reliability is the probability of a system or service to perform its intended function satisfactorily over a specific period of time under specific conditions. The keywords are probability, intended function, satisfactorily, specific period of time, and specific conditions.

3. The reliability of the entire system is called ______
a) Partial reliability
b) Isolated reliability
c) Closed reliability
d) System reliability

Explanation: The reliability of the entire system is called system reliability. A system is the collection of items such as subsystems, components, units, blocks etc.

4. System reliability for components kept in series _______ as the number of components increases.
a) Increases
b) Decreases
c) Remains unchanged
d) Cannot be determined

Explanation: System reliability for components kept in series decreases as the number of components increases. In this case, the system reliability is always less than the lowest value of reliability of any component.

5. System reliability for components kept in parallel ______ as the number of components increases.
a) Increases
b) Decreases
c) Remains unchanged
d) Cannot be determined

Explanation: System reliability for components kept in parallel increases as the number of components increases. In this case, the system reliability is always more than the highest value of reliability of any component.
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6. In series configuration of five components, the entire system will fail if ______
a) any two components fail
b) any three components fail
c) any one of the components fail
d) any four components fail

Explanation: In series configuration of five components, the entire system will fail if any one of the components fail. The entire system will work satisfactorily only if all the components work without fail.

7. In parallel configuration of five components, the entire system will fail if _____
a) any two components fail
b) any three components fail
c) all the components fail
d) any one components fail

Explanation: In parallel configuration of five components, the entire system will fail if all the components fail. The system will work satisfactorily even when any one of the parallel components fail.

8. The life-test sample plans that are terminated when a pre-assigned number of failures occur in the sample is _____
a) Failure-terminated
b) Time-terminated
c) Operation-terminated
d) Sequential

Explanation: The life-test sample plans that are terminated when a pre-assigned number of failures occur in the sample is failure-terminated. The other types of tests are time-terminated and sequential.

9. What does the graph of ‘bathtub curve’ represent?
a) Failure rate v/s Mean
b) Failure rate v/s Time
c) Failure rate v/s Distance
d) Failure rate v/s Velocity

Explanation: The ‘bathtub curve’ represents failure rate v/s time. It has three distinct phases known as the debugging phase, chance-failure phase, and the wear-out phase.

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To practice all areas of Total Quality Management, here is complete set of 1000+ Multiple Choice Questions and Answers.

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