NDDB and dairy cooperative recruitment · India · National Dairy Development Board; state cooperative milk federations
Original practice questions written to the published syllabus · not past papersSteam, water, compressed air and electricity in the milk plant, and how to audit and cut energy and water use.
In the exams: ICAR AICE subject 37 Unit 3 (water conservation) and subject 38 Units 4–5; ICAR AIEEA-PG group 18 Unit II (steam generation, compressed air, energy audit)
How our questions for NDDB and dairy cooperative recruitment spread across the units of Dairy Plant Utilities & Energy Management. Difficulty: 13 easy, 6 medium, 0 hard.
| Compressed air systems | 3 | |
| Boiler and pressure-vessel safety rules | 3 | |
| Electrical supply and power factor | 2 | |
| Energy audits | 2 | |
| Water conservation and reuse | 2 | |
| Boilers: types, fittings, mountings and efficiency | 2 | |
| Renewable energy in dairy plants: solar thermal, biogas | 2 | |
| Steam distribution and condensate recovery | 1 | |
| Water supply, treatment and quality for dairy use | 1 | |
| Heat recovery and cogeneration | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
Leaks take 5 kW of compressor power, 8,000 hours a year, with electricity at 8 currency units per kWh. What do they cost each year?
D. 320,000 currency units
5 × 8,000 = 40,000 kWh; × 8 currency units = 320,000. 40,000 currency units forgets the price; the others misplace a factor.
Further reading: Bureau of Energy Efficiency, energy manager guide books
An energy project costs 1,200,000 currency units and saves 400,000 a year. What is its simple payback?
A. 3 years
Payback = investment ÷ annual savings = 12 ÷ 4 = 3 years.
Further reading: Bureau of Energy Efficiency, energy manager guide books
In which boiler do hot combustion gases pass through tubes surrounded by water?
A. Fire-tube boiler
Shell or fire-tube boilers carry gases in tubes inside a water-filled shell.
Further reading: Ahmad, Dairy Plant Engineering and Management
Why are steam mains and fittings insulated?
C. Less heat loss
Bare pipes lose heat continuously, wasting fuel and adding condensate.
Further reading: Spirax Sarco, The Steam and Condensate Loop
How is a sodium-form softener regenerated?
B. With brine
Concentrated sodium chloride solution displaces hardness ions from the resin.
Further reading: Ahmad, Dairy Plant Engineering and Management
What does a preliminary energy audit use?
C. Bills, existing data and a walk-through
A walk-through audit finds obvious savings and decides where detailed study is needed.
Further reading: Bureau of Energy Efficiency, energy manager guide books
Which simple fitting saves hose water in washdown?
A. Shut-off nozzle
Trigger nozzles stop flow when the hose is put down.
Further reading: Tetra Pak, Dairy Processing Handbook
Ten here, 19 in the app. The Laisha app has every practice question we have written to NDDB and dairy cooperative recruitment in this subject, marked as you go, with timed papers, a jump-to-unanswered list and a certificate when you pass at 70 per cent.
Free for ten days, then one subscription of US$10 a month. We would rather say so here than have you find it later.
An AI operating system for agriculture: free guides, manuals and tools written for every country.