NDDB and dairy cooperative recruitment · India · National Dairy Development Board; state cooperative milk federations
Original practice questions written to the published syllabus · not past papersPlanning a dairy plant from product mix to building: location, layout, equipment sizing, pressure vessels, costing and commissioning.
In the exams: ICAR AIEEA-PG group 17 Unit II (dairy plant layout and design, functional design, space requirement); ICAR AICE subject 38 Unit 5
How our questions for NDDB and dairy cooperative recruitment spread across the units of Dairy Plant Design, Layout & Project Engineering. Difficulty: 4 easy, 12 medium, 13 hard.
| Project costing, feasibility and detailed project reports | 7 | |
| Plant location and site selection | 6 | |
| Product mix and capacity planning | 6 | |
| Layout of reception, processing, packing and storage areas | 3 | |
| Equipment sizing and selection | 2 | |
| Building, floors, drains and services | 2 | |
| Functional design and space requirements | 1 | |
| Pressure vessel design: codes, shells, heads and supports | 1 | |
| Installation, commissioning and validation | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
Two sites are scored on milk supply, water, effluent route and land cost with weights 0.4, 0.3, 0.2 and 0.1. Site X scores 8, 6, 7 and 5; site Y scores 6, 9, 6 and 8. Which site has the higher weighted score?
D. Site Y, with 7.1 against 6.9
X = 0.4×8 + 0.3×6 + 0.2×7 + 0.1×5 = 6.9; Y = 0.4×6 + 0.3×9 + 0.2×6 + 0.1×8 = 7.1, so Y is preferred. Reading the unweighted totals (26 and 29) ignores the weights the planners chose, and Y wins on those too.
A plant must pasteurise 200,000 litres a day in 16 productive hours, and the designers add a 10 percent margin for growth. What pasteuriser capacity should be specified?
B. 13,750 litres per hour
Required rate = 200,000 ÷ 16 = 12,500 L/h; with a 10% margin, 12,500 × 1.1 = 13,750 L/h. 12,500 omits the margin; 8,333 divides by 24 hours instead of the productive hours; 11,250 subtracts the margin instead of adding it.
In the flush season a plant receives 300,000 litres a day and its liquid milk and fresh products need 180,000 litres. How much milk must the conversion section handle each day?
C. 120,000 litres a day
Surplus for conversion = 300,000 − 180,000 = 120,000 L/day. 180,000 is the fresh-product allocation; 480,000 adds instead of subtracting; 300,000 is the whole intake.
Why might the bottleneck of a dairy plant move between the lean and flush seasons?
A. The product mix changes, so different lines reach full capacity in different seasons
In the lean season most milk goes to liquid products, so that line limits; in the flush the surplus goes to the drier or butter line, which then limits. Rated capacities and silo volumes do not change with the season in the way the other options claim.
Which strategy raises annual capacity utilisation of a seasonal dairy plant without new equipment?
C. Price incentives that flatten milk intake across the year
Seasonal pricing that rewards lean-season milk narrows the gap between flush and lean intake, so equipment runs closer to capacity all year. A larger drier lowers utilisation further; cutting products or closing the section reduces use of the plant rather than raising it.
Why should packaging materials be de-boxed in a separate area before entering production rooms?
D. Outer cartons carry dust and pests and should not enter clean areas
Outer cartons travel through warehouses and trucks and bring dust, insects and microorganisms. Removing them outside production protects clean areas. Legal weighing and warming are not the reason.
What must a hygienic dairy pressure vessel's supports satisfy in addition to the pressure code?
B. Allow floor cleaning beneath and avoid crevices that trap soil
Legs and supports must leave space to clean the floor and must not create crevices or ledges, so hygienic design rules apply alongside the structural ones. Rusting supports and supports set into drains are unhygienic.
Which section of a detailed project report for a dairy plant states the expected seasonal milk intake and its price assumptions?
A. The milk procurement plan
The procurement plan describes the milk shed, collection system, expected flush and lean intake and procurement price assumptions, which drive capacity and profitability. The other sections describe staff, buildings and equipment.
A project network has two paths: A–B–D taking 4 + 6 + 5 weeks, and A–C–D taking 4 + 9 + 5 weeks. What is the critical path and its duration?
C. A–C–D, 18 weeks
Path durations are 15 weeks for A–B–D and 18 weeks for A–C–D; the longest path is critical, so the project takes 18 weeks. 13 weeks omits activity A; 24 weeks adds every activity as if all were in series.
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