130
Modern Refrigeration and Air Conditioning
3. Refrigerants that are composed of carbon,
chlorine, and fluorine are called _____.
A. CFCs
B. HCFCs
C. HFCs
D. inorganic compounds
4. Refrigerants that are composed of carbon,
chlorine, fluorine, and hydrogen are
called _____.
A. CFCs
B. HCFCs
C. HFCs
D. inorganic compounds
5. Which halogenated refrigerants have no ozone
depletion potential?
A. CFCs
B. HCFCs
C. HFCs
D. Inorganic compounds
6. Refrigerant blends that act like a single
refrigerant with fixed boiling and condensing
points are called _____.
A. azeotropes
B. expendable refrigerants
C. freezants
D. zeotropes
7. Refrigerant blends with refrigerants that
respond individually to changes in temperature
and pressure are called _____.
A. azeotropes
B. expendable refrigerants
C. freezants
D. zeotropes
8. The separating of a zeotropic blend’s individual
refrigerants during phase change is known as
_____.
A. bubble point
B. dew point
C. fractionation
D. temperature glide
9. The range of temperatures at which individual
refrigerants in a zeotropic blend change phase
is called _____.
A. bubble point
B. dew point
C. fractionation
D. temperature glide
10. Refrigerants that are represented by 400s in the
numbering system are called _____.
A. azeotropes
B. expendable refrigerants
C. freezants
D. zeotropes
11. Refrigerants that are represented by 500s in the
numbering system are called _____.
A. azeotropes
B. expendable refrigerants
C. freezants
D. zeotropes
12. How many carbon atoms are in a molecule of
R-23?
A. 1
B. 2
C. 3
D. 4
13. Which widely used CFC refrigerant that is
no longer manufactured is stored in white
cylinders?
A. R-12
B. R-22
C. R-134a
D. R-410A
14. The ability of a refrigerant to be harmful
or lethal with acute or chronic exposure is
its _____.
A. coefficient of performance
B. flammability
C. fractionation
D. toxicity
15. A substance’s capacity to ignite and burn is
its _____.
A. coefficient of performance
B. flammability
C. fractionation
D. toxicity
16. A _____ shows how a refrigerant’s temperature
and pressure both rise and fall in direct relation
to each other.
A. pressure-enthalpy diagram
B. pressure-enthalpy table
C. pressure-temperature curve
D. material safety data sheet
17. A _____ numerically shows the thermodynamic
properties of a refrigerant under saturated
conditions.
A. pressure-enthalpy diagram
B. pressure-enthalpy table
C. pressure-temperature curve
D. material safety data sheet
18. A _____ visually graphs the thermodynamic
properties of a refrigerant.
A. pressure-enthalpy diagram
B. pressure-enthalpy table
C. pressure-temperature curve
D. material safety data sheet