List of top Questions asked in CBSE CLASS XII

In a window air conditioner, ............ type of evaporator is used.
The principle of evaporative cooling is not used in:
Which one of the following is not an air conditioning system?
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 ..............
The refrigerant ammonia is:
The condenser used in a domestic refrigerator:
Which one of the following is not a type of a viscous filter?
It starts operating when the pressure in the suction line falls below a pre-determined value:
Heat transfers through the metal wall of tubing by:
Chemicals like calcium chloride, silica gel and activated alumina are commonly used for the psychrometric process of:
The psychrometric process generally used in winter air conditioning is:
In a window air conditioner, ............ is used as a safety device.
Dairy refrigeration includes:
Automatic expansion valve is also known as:
Central air conditioning system is used for:
Thermostatic expansion valve operates by responding to ...........
All pathogenic types of bacteria and nearly all other objectionable organisms in milk are killed by:
Brine is used as a secondary refrigerant in:
It starts operating when the pressure in the discharge line rises above a certain predetermined pressure.
The evaporator generally used in wine cooling is:
It is not a mode of heat transfer:
Heating of air, without any change in its specific humidity is known as:
Removal of moisture from the air, without any change in its dry bulb temperature is known as:
Normally, the ducts used in air conditioning zones have a ............ shape.