List of top Questions asked in CBSE CLASS XII

Explain the Unitary air conditioning system.
What main points must be kept in view while designing the air distribution system of an air conditioning system?
Give an example of an eco-friendly refrigerant and also write its properties.
Explain the ‘Radial Perimeter’ duct system with the help of a diagram.
Describe the process of ‘Chemical dehumidification’.
Describe the preservation of meat products.
Write any four advantages of green jobs.
Mention the qualities of a successful entrepreneur.
What do you understand by ‘Heat Transfer’? Write the different modes of heat transfer.
Differentiate between Blower and Exhauster.
What is a refrigerant? Give two examples.
Describe the psychrometric process used for ‘summer air conditioning’.
In ‘Shell and Tube’ condenser:
This insulating material operates best in the temperature range of \(-200^\circ C\) to \(150^\circ C\) :
Write some components of a spreadsheet.
Write any two barriers to active listening.
Give two examples of extrinsic motivation.
The refrigerant R-22 is:
The relay which is connected in series with the running winding is:
The fan which removes air or gases from a space by suction is:
In a window air conditioner, ............ type of evaporator is used.
The air supplied to the conditioned space is made free from all foreign matters such as dirt, fumes, smoke and harmful bacteria by ..............
The passage carrying conditioned air to the conditioned space is known as:
Which one of the following is not an air conditioning system?
The refrigerant ammonia is: