Refrigeration and airconditioning

What is the purpose of a liquid receiver in a refrigeration system?

• To prevent the flow of refrigerant to the evaporator

• A liquid receiver is a storage tank for holding liquid refrigerant and is located after the condenser.

• To reduce the cooling capacity of the condenser

• It is an important part of any system because it ensures liquid refrigerant is entering the expansion device

What is the main purpose of an expansion valve in a refrigeration system?

• To regulate the flow of refrigerant into the condenser

• To control the speed of the compressor

• To reduce the temperature of the refrigerant and its pressure at the evaporator inlet

• To increase the pressure in the evaporator

Why is lubrication important in a refrigeration system?

• To mix well with the refrigerant

• To increase the temperature of the oil

• To reduce the efficiency of the plant

• To provide lubrication to the compressor parts

What is the purpose of a strainer in a refrigeration system?

• To increase the flow of solid particles in the system

• To regulate the flow of refrigerant in the condenser

• To prevent the entry of solid particles into the compressor

• To cool down the liquid refrigerant

How can the amount of refrigerant inside a bottle be calculated?

• By checking the test pressure stamped on the bottle

• By using a thermometer to measure the temperature of the refrigerant

• By measuring the volume of gas in the bottle

• By weighing the bottle and subtracting the tare weight

Why is it important to maintain a dry condition in a refrigeration system?

• Moisture helps improve the efficiency of the system

• Moisture can cause ice formation and corrosion in the system

• Moisture prevents leaks in the refrigerant system

• Moisture is necessary for proper lubrication of the compressor

Food preservation. Frozen food set temperature should be between:

• 3 to 5 Degrees celcius

• -18 to -23 Degrees celcius

• -18 to -22 Degrees celcius

• 2 to 5 Degrees celcius

Refrigeration is the process of....

• increasing the temperature within a space or substances due to heat energy transfer.

• moving heat energy from hot to cold all the time due to refrigerant passing through.

• making an area or space colder by producing freezing air by the system.

• Absorbing heat energy from a substance or area, thus lowering its temperature.

Food preservation for Fruit and vegetables should be set at:

• 3 to 5 degrees celcius

• 5 to 8 degrees celcius

• -2 to -18 degrees celcius

• -18 to -22 degrees celcius

Refrigeration of __________and__________ delays the_________process and __________the onset of mould.

• vegetables, fruit, rotting, increase

• meat, fish, rotting, in creases

• fruit, vegetables, ripening, slows down

• meat, fish, ripening, slows down