List of top Questions asked in CBSE CLASS XII

What is a refrigerant? Give two examples.
Describe the preservation of meat products.
Describe the process of ‘Chemical dehumidification’.
Write any four advantages of green jobs.
Mention the qualities of a successful entrepreneur.
Write some components of a spreadsheet.
Give two examples of extrinsic motivation.
Write any two barriers to active listening.
In ‘Shell and Tube’ condenser:
This insulating material operates best in the temperature range of \(-200^\circ C\) to \(150^\circ C\) :
The refrigerant R-22 is:
The relay which is connected in series with the running winding is:
The refrigerant ammonia is:
The air supplied to the conditioned space is made free from all foreign matters such as dirt, fumes, smoke and harmful bacteria by ..............
The fan which removes air or gases from a space by suction is:
Which one of the following is not an air conditioning system?
The principle of evaporative cooling is not used in:
In a window air conditioner, ............ type of evaporator is used.
The passage carrying conditioned air to the conditioned space is known as:
The psychrometric process generally used in winter air conditioning is:
Chemicals like calcium chloride, silica gel and activated alumina are commonly used for the psychrometric process of:
Heat transfers through the metal wall of tubing by:
It starts operating when the pressure in the suction line falls below a pre-determined value:
Which one of the following is not a type of a viscous filter?
The condenser used in a domestic refrigerator: