List of top Questions asked in CBSE CLASS XII

Draw a neat and labelled diagram of an ice plant.
Explain high pressure cutout with a neat sketch.
Explain the ‘downward system’ of air distribution with a neat sketch.
Write the function of a condenser.
Describe the function of a capillary tube. Write its advantages and disadvantages.
Describe the importance of a filter in an air conditioning unit.
Describe the psychrometric process of ‘Mixing of two air streams’.
Enumerate the properties of refrigerant R-22.
Explain the different modes of ‘Heat Transfer’.
Write the steps to produce a transparent and good quality ice.
Why is text formatting necessary in a spreadsheet ? Mention any two ways of formatting content in a spreadsheet.
Mention four plants, which are used to make our home toxin free.
What are thermal insulating materials ?
Write any four government schemes that helps small scale entrepreneurs to gain capital.
Describe the process of ‘Sensible Heating’.
Enlist the four ways to manage stress.
What is the air temperature range in air blast freezers ?
These type of fans are not used in an air conditioning plant.
State four key communication skills.
What is the function of a drier in a refrigeration system ?
It is not a duct system –
The freon group of refrigerants are
The relay which is operated by the heat produced due to flow of electric current –
Poultry meat is preserved by _________.
Which one among the following is not a psychrometric process ?