List of top Questions asked in CBSE CLASS XII

The refrigerant ammonia is:
Which one of the following is not a type of a viscous filter?
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:
The psychrometric process generally used in winter air conditioning is:
The condenser used in a domestic refrigerator:
It starts operating when the pressure in the suction line falls below a pre-determined value:
All pathogenic types of bacteria and nearly all other objectionable organisms in milk are killed by:
Central air conditioning system is used for:
In a window air conditioner, ............ is used as a safety device.
Thermostatic expansion valve operates by responding to ...........
Dairy refrigeration includes:
Automatic expansion valve is also known as:
Brine is used as a secondary refrigerant in:
The evaporator generally used in wine cooling is:
Heating of air, without any change in its specific humidity is known as:
It is not a mode of heat transfer:
It starts operating when the pressure in the discharge line rises above a certain predetermined pressure.
Normally, the ducts used in air conditioning zones have a ............ shape.
Removal of moisture from the air, without any change in its dry bulb temperature is known as:
Mention any two ways to reduce the amount of waste generated.
Define entrepreneurship.
Write various types of spreadsheet.
Write the steps to save a presentation.
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