REFRIGERANT AND INSULATION - Practice Mode

1) How the refrigerants are classified based on heat absorption by latent and sensible heat?

Primary and secondary Organic and inorganic Zeotropic and azeotropic Halocarbons and hydrocarbons

Correct Answer: Primary and secondary

2) Which refrigerant is inactive to ozone layer?

R 12 R 13 R 22 R 134a

Correct Answer: R 134a

3) Which is the numerical designation of ammonia refrigerant?

700 + ( Molecular mass of NH3) = 717 700 + (Molecular mass of NH3) = 718 700 + (Molecular mass of NH3) = 719 700 + (Molecular mass of NH 3) = 720

Correct Answer: 700 + ( Molecular mass of NH3) = 717

4) What does the number 4 of R 134a indicate?

Number of hydrogen atoms Number of chlorine atoms Number of carbon atoms Number of fluorine atoms

Correct Answer: Number of fluorine atoms

5) Which substance absorbs heat and directly changes its state from solid to vapour?

Ice Dry ice Primary refrigerants Secondary refrigerants

Correct Answer: Dry ice

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