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Refrigeration and Air Conditioning Technician
REFRIGERANT AND INSULATION
Set 4
Set 4
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Q10252
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How the refrigerants are classified based on heat absorption by latent and sensible heat?
A
Primary and secondary
B
Organic and inorganic
C
Zeotropic and azeotropic
D
Halocarbons and hydrocarbons
Q10253
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Which refrigerant is inactive to ozone layer?
A
R 12
B
R 13
C
R 22
D
R 134a
Q10254
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Which is the numerical designation of ammonia refrigerant?
A
700 + ( Molecular mass of NH3) = 717
B
700 + (Molecular mass of NH3) = 718
C
700 + (Molecular mass of NH3) = 719
D
700 + (Molecular mass of NH 3) = 720
Q10255
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What does the number 4 of R 134a indicate?
A
Number of hydrogen atoms
B
Number of chlorine atoms
C
Number of carbon atoms
D
Number of fluorine atoms
Q10256
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Which substance absorbs heat and directly changes its state from solid to vapour?
A
Ice
B
Dry ice
C
Primary refrigerants
D
Secondary refrigerants
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