This set of Industrial Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Reliability Redundancy and its Types”.
1. Which of the following statements is/are not correct about the redundancy of the system?
a) Redundancy is the provision of alternative mean and/ or parallel path so that the system will fail if and only if all the paths are failed
b) Provision of redundancy in the system increases the system reliability
c) Provision of redundancy in the system decreases the system reliability
d) Redundancy can be active or standby
View Answer
Explanation: Providing redundancy to the system will increase system reliability. It provides an alternative way to keep the system operating without failure when the mail/route line is failed.
2. What is a standby redundancy?
a) The redundant component provided in the system will work only when the main component fails
b) The redundant component provided in the system will work simultaneously along with the main component
c) Redundancy is provided for each component/machine in the path separately
d) Redundancy is provided for the path of workflow and not for each machine in the path
View Answer
Explanation:
As shown in the figure above, the standby component comes into operation when the main component fails. Switch provided facilitates the path change in the system.
3. What is an active redundancy?
a) The redundant component provided in the system will work only when the main component fails
b) The redundant component provided in the system will work simultaneously along with the main component
c) Redundancy is provided for each component/machine in the path separately
d) Redundancy is provided for the path of workflow and not for each machine in the path
View Answer
Explanation: A machine or component that is provided as a redundant will also work along with the main machine or component as shown in the figure below.
4. What is component redundancy?
a) The redundant component provided in the system will work only when the main component fails
b) The redundant component provided in the system will work simultaneously along with the main component
c) Redundancy is provided for each component/machine in the path separately
d) Redundancy is provided for the path of workflow and not for each machine in the path
View Answer
Explanation: Redundancy in a system can be provided in two types. They are:
i. Component redundancy
ii. Unit redundancy
In addition to the above, a hybrid model, which is the combination of both component and standby redundancy, also exists.
The following figure shows a component redundant system.
Note: In the figure, A, B, C and D are referred to components which may also be referred to machines.
5. What is unit redundancy?
a) The redundant component provided in the system will work only when the main component fails
b) The redundant component provided in the system will work simultaneously along with the main component
c) Redundancy provided for each component/machine in the path separately
d) Redundancy provided for the path of workflow and not for each machine in the path
View Answer
As shown in the figure above, in unit redundancy, redundancy is provided for the entire path and not for each machine/component.
6. What is also known as system redundancy?
a) Component redundancy
b) Active redundancy
c) Standby redundancy
d) Unit redundancy
View Answer
Explanation: Unit redundancy is also known as system redundancy as redundancy is provided for the entire path of the system as shown below.
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