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 papersRefrigeration systems, ice-bank and chilled-water plants, cold stores and the cold chain from farm to retail. The agricultural engineering track (refrigeration-cold-chain) gives the general theory.
In the exams: ICAR AICE subject 38 Unit 6; ICAR AIEEA-PG group 17 Unit III (refrigeration, compression systems, sizing a refrigeration machine)
ICAR AIEEA-PG — Dairy Technology (group 17)
Unit III: refrigeration and air conditioning, artificial refrigeration, compression systems, refrigeration accessories, and calculation of the size of a refrigeration machine.
How our questions for ICAR AIEEA-PG spread across the units of Dairy Refrigeration & Cold Chain. Difficulty: 21 easy, 2 medium, 0 hard.
| Vapour compression cycle and coefficient of performance | 5 | |
| Bulk milk coolers | 3 | |
| Cooling load calculation for cold stores | 2 | |
| Multi-pressure and ammonia systems | 2 | |
| Psychrometry and air conditioning | 2 | |
| Insulation and vapour barriers | 2 | |
| Hardening rooms and frozen storage | 2 | |
| Refrigerants and their environmental rules | 1 | |
| Compressors, condensers, evaporators and expansion devices | 1 | |
| Vapour absorption refrigeration and heat pumps | 1 | |
| Ice-bank and chilled-water systems | 1 | |
| Refrigerated transport and cold-chain monitoring | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
What is the Carnot COP for refrigeration with evaporation at −10 °C and condensation at 35 °C?
A. 5.85
COP = 263.15 ÷ (308.15 − 263.15) = 5.85. 0.22 uses Celsius; 6.85 is the heat-pump Carnot COP; 3.50 is a meaningless ratio of Celsius values.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
How many tons of refrigeration is 100 kW (1 TR = 3.517 kW)?
C. 28.4 TR
100 ÷ 3.517 = 28.4 TR. 351.7 multiplies; 100 ignores the conversion; 12 confuses with 12,000 Btu/h.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
A bulk milk cooler must cool 2,060 kg of milk from 35 to 4 °C in 3 hours (cp 3.9 kJ/kg K). What average refrigeration capacity is needed, ignoring losses?
A. 23.1 kW
Q = 2,060 × 3.9 × 31 = 249,054 kJ over 10,800 s = 23.1 kW. The others multiply by 3, use 35 K instead of the 31 K drop, or use 4 K.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
A cold store's calculated load is 50 kW. With a 10% safety factor, what capacity is specified?
D. 55 kW
50 × 1.1 = 55 kW; 50 kW has no margin and 60 kW uses 20%.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
Which compressor type dominates large dairy ammonia plants?
D. Screw
Screw compressors handle large volumes efficiently.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
The main purpose of a bulk milk cooler is to:
D. Cool milk quickly after milking
Prompt cooling preserves raw milk quality.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
Hardening tunnels for ice cream typically use air at about:
D. −30 to −40 °C
Fast hardening keeps ice crystals small.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
Raw milk tankers are usually:
C. Insulated but not refrigerated
Pre-cooled milk and short journeys limit warming.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
Relative humidity compares:
A. Actual and saturation vapour pressure
RH = partial pressure ÷ saturation pressure × 100.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
Direct-expansion bulk milk coolers evaporate refrigerant in:
C. Plates on the tank base and walls
Ice-bank coolers use a separate ice store.
Further reading: Stoecker and Jones, Refrigeration and Air Conditioning
Ten here, 23 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.
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