Refrigeration Systems Quiz

What is the working pressure of a typical liquid nitrogen storage tank, and how is this pressure maintained?

• By using a compressor and maintaining at 200 psi

• Through natural evaporation and maintaining at 150 psi

• By using a compressor and maintaining at 300 psi

• Through natural evaporation and maintaining at 22 psi

True or False: Solutions used in eutectic plate refrigeration are brine, calcium chloride, and sodium chloride solutions.

• True

• False

What is the primary benefit of using cold plate systems in refrigerated vehicles?

• They do not require power supply.

• They can maintain temperatures without an external power source for up to 12 hours.

• They are cheaper than other refrigeration systems.

• They use less fuel compared to other systems.

Which type of compressor is typically used in truck refrigeration systems?

• Gas-engine driven compressor

• Electric compressor operated with a motor generator

• Diesel compressor

• All of the above

Why is cascade refrigeration used in applications requiring very low temperatures?

• It is more energy-efficient at higher temperatures.

• It uses a single stage of refrigeration for simplicity.

• It allows reaching very low temperatures by using two or more stages of refrigeration.

• It is less expensive than single-stage systems.

What is the primary use of carbon dioxide (CO2) in transport refrigeration as mentioned in the text?

• To increase the temperature of products

• To maintain products at a low temperature without freezing

• To reduce the humidity around products

• To purify the air within transport vehicles

At what temperature does nitrogen evaporate as mentioned in the summary?

• -320°F

• -200°F

• -150°F

• -100°F

According to the safety precautions, what should be worn when handling nitrogen and CO2 due to their cold nature?

• Heat-resistant gloves

• Protective clothing, gloves, and goggles

• A full-face respirator

• A simple face mask

What happens when CO2 is used for refrigeration and reaches -109°F?

• It evaporates

• It sublimates

• It condenses

• It solidifies

How does a refrigerator work?

• Moves heat from inside the fridge to the room
• Blows cold air into the fridge
• Uses convection cells
• It generates cold air