refrigerants chapter 114

which of the following characteristics is common in all of the group B refrigerants? A) high toxicity B) high flammability C) non-toxic but highly flammable D) low toxicity E) low flammability

A) high toxicity

R-134a is non-toxic and non-flammable. Which of the following groups does it belong to? A) Group A2 B) Group B4 C) Group A1 D) Group A3 E) Group B2

C) Group A1

The amount of heat absorbed by a refrigerant in the evaporator is equal to its: a) latent heat of evaporation b) latent heat of fusion c) latent heat of vaporization minus the heat required to flash the liquid due to the pressure drop. D) latent heat of vaporization plus the heat required to flash the liquid due to the pressure drop E) specific heat

C) Latent eat of vaporization minus the heat required to flash the liquid due to the pressure drop

Ammonia, as well as being toxic, is also: a) miscible b) odourless C) flammable d) dense e) a low presure refrigerant

C) flammable

Ammonia refrigerants: A) Have high sensible heat capacity. b) Mix well with oil. c) Are very expensive. D) Are well suited for industrial refrigeration. E) Are ideally suited to copper piping system.

D) are well suited for industrial refrigeration

The ideal refrigerant should be: A) have a low latent heat capacity B) have a high boiling point C) have high condensing pressure D) be environmentally friendly E) be easily detected because of its strong odor

D) be environmentally friendly

WHich of the following is not a physical property of refrigerants? A) toxicity B) odour C) leakage tendency D) Corrosiveness E) Miscibility

D) corrosiveness

Which of the following has the highest boiling point at atmospheric pressure? A) Ammonia B) Freon 12 C) Freon 22 D) Freon 113 E) Water

E) water

the standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. these standard conditions are: A) 1030 kPa and atmospheric pressure B) 30 'C condensing and -15'C evaporating C) 30 kPa and atmospheric pressure D) -30'C condensing and 15'C evaporating E) 30 kPa and atmospheric temperature

B) 30 'C condensing and -15'C evaporating

The latent heat of fusion of ice is: A) the sensible heat required for melting ice B) 335 kJ per kg C) 335 kJ per ton D) the latent heat required for evaporation of ice E) 4.2 kJ per gram

B) 335 kJ per Kg