To purchase equipment for food service establishments effectively, following the correct sequence of steps ensures that the procurement process is efficient and meets the required specifications. Let us break down each step to understand the logic behind the correct sequence:

1. Assess the need: This is the first logical step. Before purchasing any equipment, it is crucial to understand what is required based on the current needs of the establishment. This involves evaluating existing equipment and identifying gaps.
2. Decide on the list of equipments to be purchased: After assessing the needs, the next step is to make a definitive list of equipment that needs to be purchased.
3. Estimate the expenditure by obtaining prices from different sources: Once the list is finalized, the next step is to estimate the cost. This involves obtaining prices for these items from various sources to ensure the best deal.
4. Set guidelines/specifications for purchase of these items: Based on the need and available budget, set guidelines and specifications that the equipment must meet. This ensures that all purchases align with quality and operational requirements.
5. Select after careful consideration ensuring that the equipment satisfies the required specification: Finally, select the equipment that not only fits the budget but also meets all the established guidelines and specifications. This step ensures the equipment purchased is of good quality and fits the intended purpose.

Thus, the correct order of steps for purchasing equipment for food service establishments is: (c), (e), (b), (a), and (d).