Online testing: Test about Basic Refrigeration Theory (CBT)

During automatic operation of a refrigeration system the starting and stopping of the compressor is usually achieved by which of the following?

From the following options select those, which may cause the refrigeration system high pressure cut out to operate and stop the compressor?

If a running system regularly requires change of refrigerant, what should be done?

Put in the correct words. According to the second law of thermodynamics heat can only transfer naturally from a region of high temperature to a region of ____ unless mechanical work is done on the system.

The closed cycle refrigeration system works on the principle of which of the following?

The ideal temperature of a freeze room is:

The operation of the automatic expansion valve is based on:

The operation of the thermostatic expansion valve is based on:

The term “specific enthalpy” of a fluid, measured in kJ/kg, is used to quantity the energy per unit mass due to:

To be able to evaporate a medium at -20 °C and to condense the same medium at 30 °C we have to:

What are the disadvantages of ammonia as a refrigerant?

What are the main components in a closed refrigeration cycle?

What is absolute pressure?

What is the disadvantage of the manually operated expansion valve?

What is the main problem with Carbon dioxide as a refrigerant?

What is the saturation temperature?

What will be an adequate allowance for oil circulation in a refrigeration system?

When the desired cold room temperature is reached in a refrigeration system operating on the direct expansion principle, which of the following shuts off the evaporator for the room?

Which of the following components are parts of the high-pressure side in a refrigeration system?

Which of the following does the term latent heat describe when referring to a refrigerant?

Which of the following indicates refrigerant undercharge?