ICAR AIEEA-PG: Dairy Science (group 16) and Dairy Technology (group 17) · India · NTA for ICAR
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)
ICAR AIEEA-PG — Food Science (group 18) and Dairy Technology (group 17)
Group 18 Unit II: equipment for steam generation, compressed air, refrigeration, water and wastewater treatment, and energy audit; group 17 Unit III: thermodynamics and electrical engineering fundamentals.
How our questions for ICAR AIEEA-PG spread across the units of Dairy Plant Utilities & Energy Management. Difficulty: 18 easy, 30 medium, 0 hard.
| Boilers: types, fittings, mountings and efficiency | 8 | |
| Steam distribution and condensate recovery | 7 | |
| Electrical supply and power factor | 7 | |
| Renewable energy in dairy plants: solar thermal, biogas | 5 | |
| Energy audits | 4 | |
| Heat recovery and cogeneration | 4 | |
| Water conservation and reuse | 4 | |
| Boiler and pressure-vessel safety rules | 4 | |
| Water supply, treatment and quality for dairy use | 4 | |
| Compressed air systems | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
A boiler makes 2,000 kg/h of steam (enthalpy 2,770 kJ/kg) from feed water at 335 kJ/kg, burning 140 kg/h of oil with a gross calorific value of 42,000 kJ/kg. What is its efficiency by the direct method?
A. 82.8%
Efficiency = 2,000 × (2,770 − 335) ÷ (140 × 42,000) = 82.8%. The others ignore feed enthalpy, subtract the feed temperature instead of its enthalpy, or invert the ratio.
Further reading: Bureau of Energy Efficiency, energy manager guide books
Condensate with a sensible heat of 721 kJ/kg is released to atmospheric pressure (sensible heat 419 kJ/kg, latent heat 2,257 kJ/kg). What fraction flashes to steam?
C. 13.4%
Flash fraction = (721 − 419) ÷ 2,257 = 13.4%. The others divide by the condensate enthalpy, use the wrong numerator, or divide by total steam enthalpy.
Further reading: Spirax Sarco, The Steam and Condensate Loop
A heat pump delivers 300 kW of heat using 75 kW of electricity. What is its heating COP?
B. 4.0
Heating COP = 300 ÷ 75 = 4.0. 3.0 would be the cooling COP (225 ÷ 75).
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 is steam often distributed at higher pressure and reduced near the point of use?
C. Mains are smaller; low-pressure steam has more latent heat
Higher pressure means denser steam and smaller pipes; latent heat per kilogram rises as pressure falls.
Further reading: Spirax Sarco, The Steam and Condensate Loop
Why are chlorides in process water a concern in dairies?
A. They pit and crack stainless steel
Chloride attacks the passive layer, causing pitting and stress corrosion cracking, worse when hot.
Further reading: Ahmad, Dairy Plant Engineering and Management
Where does most of the electrical input to an air compressor end up?
B. As heat
Most input becomes heat, which can be recovered for water or space heating.
Further reading: Bureau of Energy Efficiency, energy manager guide books
How is a low power factor usually corrected?
A. Capacitor banks
Capacitors supply reactive power locally, cutting kVA drawn from the grid.
Further reading: Ahmad, Dairy Plant Engineering and Management
In a liquid milk plant, which is often the largest electrical user?
D. Refrigeration
Refrigeration for chilling and cold storage commonly leads electrical use.
Further reading: Tetra Pak, Dairy Processing Handbook
What is the typical methane content of biogas from dairy effluent?
D. 60–70%
The rest is mainly CO₂ with traces of H₂S and water vapour.
Further reading: Tetra Pak, Dairy Processing Handbook
Ten here, 48 in the app. The Laisha app has every practice question we have written to ICAR AIEEA-PG 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.
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