JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV PRODUCTION PLANNING AND CONTROL Previous Question Paper (September - 2022 - R16)

The scope of Production Planning and Control (PPC) encompasses the entire lifecycle of manufacturing operations, ensuring the efficient utilization of resources to meet customer demand. Its primary functions include:

• Planning: Determining the quantity, quality, and timing of production. This involves forecasting demand, capacity planning, and material requirements planning (MRP).
• Routing: Establishing the optimal sequence of operations and the path a product follows through various machines and workstations.
• Scheduling: Assigning specific start and finish times for each operation to ensure timely delivery and optimal machine utilization.
• Dispatching: The execution phase where work orders are released, and materials are moved to the production floor to initiate the process.
• Follow-up and Expediting: Monitoring progress against the schedule, identifying bottlenecks, and taking corrective actions to minimize delays or deviations.
• Inventory Control: Managing raw materials, work-in-progress, and finished goods to balance holding costs against service levels.

Production systems are categorized based on volume and variety. The main types are:

• Job Shop Production: Characterized by low volume and high variety. Products are made to customer specifications in small batches using general-purpose equipment.
• Batch Production: Involves producing a limited number of identical items in a group. It balances flexibility and efficiency, using specialized tools for specific batches.
• Mass Production: High volume, low variety. Standardized products are manufactured using specialized, automated equipment and assembly lines to achieve economies of scale.
• Continuous Production: Extremely high volume with no variety. The process runs 24/7 (e.g., oil refineries or chemical plants) where the product flow is continuous and highly automated.

The differentiation lies in the trade-off between flexibility and efficiency: Job shops offer maximum flexibility but lower efficiency, whereas continuous production offers maximum efficiency but zero flexibility for product changes.