Test on Operations Management and Industrial Maintenance

Question 1: Modified maintenance involves performing maintenance tasks on equipment while it is already stopped for another intervention, with the goal of replacing key components simultaneously to reduce overall costs.

A. Ano

B. Ne

Explanation: Modified maintenance, also called Improvement Maintenance, is characterized by performing maintenance tasks while the equipment is already stopped for another intervention. The key point is to replace key components of the same equipment at the same time to reduce overall cost.

Question 2: According to the study materials, which of the following is essential for achieving high availability (A(t)) of equipment?

A. Low reliability and quick repairs

B. High reliability and quick repairs

C. Only unavoidable failures, regardless of repair speed

D. Long repair times even with a very low number of failures

Explanation: The study materials state that 'High availability, A(t), requires both high reliability (fewer breakdowns) and high maintainability (quick repairs).' It also mentions that 'Long repair times even though the number of failures is very low' leads to low availability.

Question 3: Overall Equipment Effectiveness is determined by summing the percentages of Availability, Productivity, and Quality.

A. Ano

B. Ne

Explanation: The study materials define %OEE as %Availability * %Productivity * %Quality, which means it is calculated by multiplying these percentages, not by summing them.

Question 4: Productivity, a component of Overall Equipment Effectiveness (OEE), is calculated by dividing the Design speed by the Operating speed.

A. Ano

B. Ne

Explanation: According to the study materials, Productivity is calculated as 'Operating speed / Design speed', not Design speed / Operating speed.

Question 5: According to the study materials, which statement accurately describes the activation mechanism of sequential redundancy?

A. All elements in the system operate simultaneously to provide continuous support.

B. The backup system becomes active only when the primary component experiences a failure.

C. The system activates its backup only during the 'wear-out failures' phase as equipment ages.

D. The backup element is used to address initial failures caused by defects or design flaws.

Explanation: Sequential Redundancy (or Stand-by) is defined as a system where the 'Backup activates only after failure', as stated in the study materials.