Refrigeration and Cold Chain Management MCQs

1. : What is the primary purpose of refrigeration in food storage?
(A) To kill microorganisms
(B) To slow down microbial growth
(C) To improve taste
(D) To increase moisture

2. : Which refrigerant is commonly used in modern refrigeration systems?
(A) Ammonia (NH₃)
(B) Carbon dioxide
(C) Sulphur dioxide
(D) Nitrogen

3. : The term “cold chain” refers to:
(A) A food packaging method
(B) A temperature-controlled supply chain
(C) A chain of food distributors
(D) A type of refrigeration gas

4. : What is the typical temperature range for frozen food storage?
(A) 0°C to 5°C
(B) -18°C or below
(C) 10°C to 15°C
(D) -5°C to 0°C

5. : Which of the following is a secondary refrigerant?
(A) Water
(B) Air
(C) Brine
(D) Ammonia

6. : What is the function of the condenser in a refrigeration system?
(A) To absorb heat
(B) To compress the refrigerant
(C) To release heat
(D) To expand the refrigerant

7. : The evaporator in a refrigeration system is responsible for:
(A) Heat absorption
(B) Pressure control
(C) Lubrication
(D) Air compression

8. : Which factor most affects cold storage energy efficiency?
(A) Wall insulation quality
(B) Product color
(C) Storage bin size
(D) Packaging design

9. : What is the common temperature for chilled food storage?
(A) 10°C
(B) 4°C
(C) -10°C
(D) 15°C

10. : Which device controls the flow of refrigerant into the evaporator?
(A) Compressor
(B) Expansion valve
(C) Condenser
(D) Evaporator coil

11. : The coefficient of performance (COP) of a refrigerator is the ratio of:
(A) Work input to heat output
(B) Heat removed to work input
(C) Heat output to work input
(D) Refrigerant mass to heat output

12. : Which gas is known as an ozone-friendly refrigerant?
(A) R-22
(B) R-134a
(C) R-12
(D) R-11

13. : What type of refrigerant is most commonly used in large industrial systems?
(A) Carbon dioxide
(B) Ammonia
(C) R-410A
(D) Propane

14. : In cold chain logistics, temperature monitoring is important to:
(A) Improve packaging
(B) Reduce transport costs
(C) Maintain product quality and safety
(D) Reduce odor

15. : Which of the following is not a component of a basic refrigeration cycle?
(A) Condenser
(B) Compressor
(C) Absorber
(D) Expansion valve

16. : Which method is most suitable for quick freezing of food?
(A) Air blast freezing
(B) Cryogenic freezing
(C) Plate freezing
(D) All of the above

17. : Which of the following materials is best for cold storage insulation?
(A) Concrete
(B) Polyurethane foam
(C) Glass
(D) Metal

18. : What is the main disadvantage of using ammonia as a refrigerant?
(A) Low efficiency
(B) Toxic and corrosive nature
(C) High cost
(D) Poor cooling capacity

19. : The process of reducing temperature below freezing to preserve food is called:
(A) Refrigeration
(B) Pasteurization
(C) Freezing
(D) Chilling

20. : Which type of freezer uses cold air blown over food?
(A) Contact freezer
(B) Blast freezer
(C) Plate freezer
(D) Immersion freezer

21. : Which of the following is a natural refrigerant?
(A) R-12
(B) R-134a
(C) Ammonia
(D) Freon

22. : The triple point of water is:
(A) 0°C
(B) -273°C
(C) 100°C
(D) 0.01°C

23. : Which law governs the relationship between temperature and pressure in gases?
(A) Boyle’s Law
(B) Charles’s Law
(C) Avogadro’s Law
(D) Dalton’s Law

24. : Which part of a cold chain ensures distribution temperature control?
(A) Transport vehicle
(B) Packaging
(C) Condenser
(D) Compressor

25. : A walk-in cold room is mainly used for:
(A) Short-term food processing
(B) Long-term preservation
(C) Drying of foods
(D) Cooking