Low temperature physics unit 3 & Unit 4

A typical refrigeration cycle would operate between a +27°C condenser temperature and a -23°C evaporator temperature. Here, what would be the performance of the cycle’s Carnot coefficient?

• 6

• 5

• 1.2

• 0.2

Abbreviation of COP is

• Cooling Of Performance

• Capacity of Performance

• Coefficient of Performance

• Coefficient of Pressure

Efficiency of the Refrigerator is _________ to the C.O.P of the refrigerator.

• Directly proportion

• Independent

• Inversely proportional

• Equal

Which of the following is the material of tubes used for shell and tube condenser in ammonia refrigeration system?

• Copper

• Brass

• Steel

• Aluminium

Which of the following part will produce lowest temperature in vapor compression refrigeration.

• Evaporator

• Compressor

• Condenser

• Expansion valve

What does a vapor absorption refrigerator use in the form of a refrigerant?

• Water

• Aqua-Ammonia

• Ammonia

• Freon

Refrigeration is

• the process of removing heat from a substance and cooling it to a temperature or below the actual temperature

• the process of adding heat from a substance and cooling it to a temperature

• used to increase the level of humidity in the air by adding heat

• None of these

Which of the following is the main disadvantage of natural refrigeration methods?

• Expensive

• Poisonous

• Not environment friendly

• Depend on local conditions

Air conditioning is

• the process of adding heat and increasing the humidity

• the process of removing heat and controlling the humidity of air in a closed space

• the process of controlling air moisture in an open area by adding heat

• None of these

The SI unit of One ton of refrigeration is equivalent to:

• 355 kJ/min

• 255 kJ/unit

• 21 kJ/unit

• 210 kJ/unit