Agro Processing Plant Design Questions and Answers

Answer: C

Correct answer: Only three

Three are correctly described. The fourth is not: payback ignores the time value of money entirely - it simply counts undiscounted cash until the outlay is recovered. That, with its blindness to everything after the payback point, is why it is a screening measure rather than a decision rule.

Answer: D

Correct answer: Only three

Unidirectional flow, drainable equipment and short paths are all correctly matched to their purposes. Symmetrical placement is not a hygiene measure at all - it is an aesthetic or structural convenience, and symmetry does nothing to keep raw and finished product apart.

Answer: A

Correct answer: Raw material stocks

Raw material stocks are working capital: money tied up in the goods themselves, recovered when the product is sold. Equipment, buildings and installation are all one-off fixed capital, written down over the plant’s life.

Answer: B

Correct answer: The plant's rated throughput

Throughput is set by the capacities of the machines - specifically by the slowest of them - not by where they stand. Layout governs travel distance, handling cost and contamination risk; it can waste a plant’s capacity but cannot create any.

Answer: C

Correct answer: A higher selling price per tonne

Breakeven is fixed cost divided by contribution, and a higher price raises the contribution, so the breakeven output falls. Higher fixed costs raise the numerator; a higher variable cost cuts the contribution; and depreciation is itself a fixed cost. All three of those push breakeven up.

Answer: D

Correct answer: Pasteurisation

Pasteurisation is a process operation - something done to the product. Steam, compressed air and refrigeration are utilities: services generated centrally and distributed to whichever operation needs them. Pasteurisation is in fact a consumer of the steam.

Answer: A

Correct answer: Scaling directly from laboratory to full size

Going straight from bench to full scale is the classic way to be surprised: heat transfer, mixing, handling and fouling all behave differently at size, and the raw material in the field is never as uniform as the sample in the laboratory. A pilot plant, established equipment and trials on the actual crop all reduce that risk; skipping the intermediate step increases it.

Answer: B

Correct answer: Near the orchards, the fruit being perishable

The raw material is bulky and perishable and the product is stable and compact, so the transport problem lies on the inbound side. Siting near the orchards gets the fruit into process while it is fresh and avoids hauling water and skin that will be discarded anyway. The aseptic pulp can then travel any distance.

Answer: C

Correct answer: Uprate the limiting stage, then the next

The line is delivering the capacity of its slowest stage, and material accumulating in front of one machine identifies it. Uprate that one, then look again - the next slowest becomes the constraint, and debottlenecking proceeds one stage at a time. Uprating everything equally would spend far more for the same result.

Answer: D

Layout is a preventive control, and a plan that brings raw and finished material together will eventually transfer contamination whatever the cleaning regime. Unidirectional flow from dirty to clean is the governing principle.