List of top Questions asked in CBSE CLASS XII

Describe the importance of an overload protector with the help of a diagram.
Explain the Unitary air conditioning system.
Explain the ‘Radial Perimeter’ duct system with the help of a diagram.
Give an example of an eco-friendly refrigerant and also write its properties.
What main points must be kept in view while designing the air distribution system of an air conditioning system?
Write the properties of R-12.
What do you understand by ‘Heat Transfer’? Write the different modes of heat transfer.
Describe the process of ‘Chemical dehumidification’.
What is a refrigerant? Give two examples.
Write any four advantages of green jobs.
Differentiate between Blower and Exhauster.
Describe the preservation of meat products.
Mention the qualities of a successful entrepreneur.
Describe the psychrometric process used for ‘summer air conditioning’.
The relay which is connected in series with the running winding is:
Give two examples of extrinsic motivation.
Write some components of a spreadsheet.
Write any two barriers to active listening.
This insulating material operates best in the temperature range of \(-200^\circ C\) to \(150^\circ C\) :
In ‘Shell and Tube’ condenser:
The refrigerant R-22 is:
The passage carrying conditioned air to the conditioned space is known as:
The fan which removes air or gases from a space by suction is:
The air supplied to the conditioned space is made free from all foreign matters such as dirt, fumes, smoke and harmful bacteria by ..............
Which one of the following is not an air conditioning system?