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Book 2 PanGlobal Assessment Test > Chapter 16 Refrigerants > Flashcards

Chapter 16 Refrigerants Flashcards

1
Q 
1. Refrigerants that are highly flammable with low toxicity belong to Group:
A. B3
B. A2
C. A3
D. B1
E. B2
A

C. A3

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2
Q 
2. Refrigerants that are highly flammable and highly toxic belong to Group:
A. B3
B. A2
C. A3
D. B1
E. B2
A

A. B3

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3
Q 
3. Which of the following refrigerants is not miscible with oil?
A. Freon 12 (R-12)
B. Freon 134a (R-134a)
C. Ammonia (R-717)
D. Freon 11 (R-11)
E. Freon 22 (R-22)
A

C. Ammonia (R-717)

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4
Q 
4. What is the boiling temperature of R-134a (Freon 34a)at atmospheric conditions?
A. 47.6°C (117.68°F)
B. -33.3°C (-27.94°F)
C. -26.1°C (-14.98°F)
D. -40.8°C (-41.44°F)
E. 3.6°C (38.5°F)
A

C. -26.1°C (-14.98°F)

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5
Q 
5. What is the boiling temperature of R-22 (Freon 22) at atmospheric conditions?
A. 47.6°C (117.68°F)
B. -33.3°C (-27.94°F)
C. -26.1°C (-14.98°F)
D. -40.8°C (-41.44°F)
E. 3.6°C (38.5°F)
A

D. -40.8°C (-41.44°F)

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6
Q 
6. What is the boiling temperature of R-717 (ammonia) at atmospheric conditions?
A. 47.6°C (117.68°F)
B. -33.3°C (-27.94°F)
C. -26.1°C (-14.98°F)
D. -40.8°C (-41.44°F)
E. 3.6°C (38.5°F)
A

B. -33.3°C (-27.94°F)

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7
Q 
7. The condition known as standard condition" indicates a standard condenser
temperature of:
A. -15°C (5°F)
B. 30°C (86°F)
C. 15°C (59°F)
D. -30°C (-22°F)
E. -10°C (14°F)
A

B. 30°C (86°F)

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8
Q 
8. Refrigerants are classified in the Canadian Standards Association B52-05
Mechanical Refrigeration Code by their toxicity and flammability into the following
\_\_\_\_\_ groups.
A. Two
B. Three
C. Four
D. Five
E. Six
A

E. Six

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9
Q 
9. Liquid refrigerants are fluids that, at atmospheric pressure, have a boiling point
considerably:
A. Lower than that of water
B. High than that of water
C. Lower than that of oxygen
D. Higher than that of oxygen
E. Lower than that of oil
A

A. Lower than that of water

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10
Q

10.Moisture in the refrigerant may lead to:
A. Acid formation resulting in corrosion, sludge formation in the compressor crank
case
B. Over cooling of the refrigerant
C. High pressure in the evaporator
D. Low temperature in the condenser
E. Ice forming in the condenser

A

A. Acid formation resulting in corrosion, sludge formation in the compressor crank
case

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11
Q

11.Moisture in the refrigerant may lead to:
A. Ice forming in the condenser
B. Over cooling of the refrigerant
C. High pressure in the evaporator
D. Low temperature in the condenser
E. Ice formation between the valve and valve seat of the regulating or expansion
valve

A

E. Ice formation between the valve and valve seat of the regulating or expansion
valve

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12
Q 
12.Which one of the following factors affect the leakage tendency of a refrigerant?
A. Temperature
B. Viscosity
C. Enthalpy
D. Specific volume
E. Miscibility
A

B. Viscosity

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13
Q 
13.Which one of the following factors affect the leakage tendency of a refrigerant?
A. Enthalpy
B. Miscibility
C. Temperature
D. Specific volume
E. Density
A

E. Density

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14
Q 
14.Which one of the following factors affect the leakage tendency of a refrigerant?
A. Molecular mass
B. Temperature
C. Enthalpy
D. Specific volume
E. Miscibility
A

A. Molecular mass

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15
Q 
15.The ability of a refrigerant to be dissolved into oil and vice versa is called:
A. Leakage tendency
B. Miscibility
C. Moisture reaction
D. Density
E. Enthalpy
A

B. Miscibility

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16
Q

16.The ideal refrigerant should NOT have which of the following characteristics:
A. A low boiling point at atmospheric pressure
B. A low latent heat capacity
C. A fairly low condensing pressure
D. A non-poisonous nature
E. A non-flammable and non-explosive nature when mixed with air

A

A. A low boiling point at atmospheric pressure

17
Q

17.The saturation temperature (boiling/condensing temperature) of a liquid in a closed
vessel can be raised or lowered by altering the _____ the vessel.
A. Temperature in
B. Pressure on
C. Volume of
D. Density in
E. Pressure in

A

E. Pressure in

18
Q 
18.In an ideal situation the refrigerating effect of a refrigerant is equal to the \_\_\_\_\_ of
the refrigerant.
A. Latent heat of evaporation
B. Temperature of fusion
C. Latent heat of fusion
D. Temperature of evaporation
E. Sensible heat of fusion
A

C. Latent heat of fusion

19
Q 
19.The important physical properties of a refrigerant include all except:
A. Miscibility
B. Leakage tendency
C. Odour
D. Toxicity
E. Specific volume
A

E. Specific volume

20
Q 
20.Thermodynamic properties directly affect the movement of heat. Which of these is
NOT a thermodynamic property?
A. Pressure
B. Leakage tendency
C. Volume
D. Density
E. Enthalpy
A

B. Leakage tendency

Book 2 PanGlobal Assessment Test (40 decks)

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