Which Factor to be considered while preparing maintenance schedule?

Question

Examoogle · Accepted Answer

Option D: All of these

Explanation & Concepts:
A comprehensive maintenance schedule is designed by integrating technical, operational, and economic parameters to maximize equipment reliability. It ensures that the machine state, associated accessories, and financial impact of downtime are balanced to optimize total lifecycle costs.

Working Principle: Maintenance scheduling follows the principle of Reliability Centered Maintenance (RCM). The process requires: 1. Machine Analysis: Understanding duty cycles and failure modes. 2. Dependency Analysis: Checking inter-connected accessories. 3. Economic Analysis: Evaluating the cost of downtime versus the cost of standby units (e.g., $Cost_{maintenance} + Cost_{downtime}

Key Formulas: $Total Cost = C_{scheduled} + (P_{fail} 	imes C_{unplanned})$ — Economic objective function where $P_{fail}$ is the probability of failure; $MTBF = \frac{1}{\lambda}$ — Mean Time Between Failures, used to determine interval frequency

Key Points: Preventive maintenance minimizes unscheduled downtime.; The criticality of the equipment dictates the frequency of inspection.; Maintenance schedules must align with the manufacturer's technical manuals.; Cost-benefit analysis of standby units determines if redundant systems justify lower maintenance priority.

Advantages: Reduction in sudden equipment breakdown; Extended asset service life; Enhanced worker safety

Disadvantages: High initial planning and administrative overhead; Potential for over-maintenance leading to unnecessary costs

Applications: Power Transformers and Switchgears; Rotating electrical machinery (Motors and Generators); Industrial automation lines

Additional Info: A, B, and C are all individual components that collectively dictate the maintenance philosophy.. A schedule is only 'optimal' if it considers both the technical requirements of the hardware (machine type/accessories) and the economic impact of the shutdown (standby availability).

Answer: D is correct — A maintenance schedule must comprehensively evaluate machine characteristics, auxiliary dependencies, and the financial implications of standby unit availability to achieve operational efficiency.

Exam Tip: In competitive exams, 'All of these' is often the correct choice in maintenance management questions, as scheduling is a multi-dimensional optimization problem.

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Option A: Type of machine

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Option B: Accessories of the equipment

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Option C: Cost of stand by unit

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