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1.

What is the definition of refrigeration?

The addition of cooling

The removal of heat

The replacement of heat

The removal and relocation of heat

2.

Name 3 main processes by which objects can become colder.

Radiation, Conduction, Convection

Refrigeration, Air Conditioning, Absorption

Convection, Sublimation, Radiation

Evaporation, Condensation, Sublimation

3.

How much superheat is preferable at the outlet of an evaporator?

5 °F

10 °F

15 °F

25 °F

4.

What are the 4 main components in a refrigeration system?

TXV, Accumulator, Compressor, Condenser

Accumulator, Metering Device, TXV, Compressor

Condenser, Metering device, Evaporator, Compressor

Evaporator, Compressor, TXV, Metering Device

5.

What is in the evaporator?

Low pressure vapour and liquid

Superheated liquid and subcooled gas

Liquid and gas

High pressure superheated vapour and liquid

6.

Where is the sensing bulb of a TXV located?

Liquid Line, close to the evaporator inlet

Suction Line, close to the evaporator outlet

Suction Line, close to the evaporator inlet

Liquid Line, close to the evaporator outlet

7.

Name 2 Metric temperature scales.

Kelvin, Celsius

Celsius, Rankine

Kevin, Fahrenheit

Fahrenheit, Centigrade

8.

Which Latent Heats are involved if water is frozen then thawed and then boiled?

condensation, vapourization, sublimation

sublimation

fusion, vapourization

fusion, sublimation

9.

Which of the following are equal to 1 atmospheric pressure?

14.7

760 mm Hg

29.92

all of the above

10.

Which of the following statements is false?

If the type and temperature of a refrigerant are known, then the pressure being exerted by the refrigerant can be calculated

Recovered refrigerant must not fill a jug more than 60% by weight

Dangerous hydrostatic conditions can occur if a jug is filled 100% full with refrigerant vapour.

New jugs of refrigerant are shipped from the manufacturer 80% full by weight

Questions 11 through 89 not displayed, online exam is not active

90.

Azeotropes and Zeotropes are types of:

blends

refrigeration oils

oil seperators

filter cartridges

91.

Glide occurs with

Azeotropes (500 series)

Zeotropes (400 series)

CFC's

PFC's

92.

Suction Cut-Off is a method of:

limiting suction pressure through a CPRV

limiting suction pressure through an EPRC

head pressure control

cylinder unloading

93.

What capacity stages can a 4 cylinder compressor with 3 unloaders provide?

33%, 66%, 100%

17.5%, 33%, 52.5%, 70%, 87.5%, 100%

3 equal stages

25%, 50%, 75%, 100%

94.

Where is the best place to tie in the discharge line from a hot gas bypass valve?

the suction line before the compressor

the discharge line

between the TXV and the Evaporator

the liquid line just before the TXV

95.

Does oil pressure load or unload an internal cylinder unloading system?

load

unload

neither

both

96.

Which of the following symptom sets could be from an overcharged system?

high: discharge temperature, superheat
low: head pressure, suction pressure, subcooling

high: head pressure, suction pressure
low: discharge temperature, superheat, subcooling

high: head pressure, suction pressure, subcooling
low: discharge temperature, superheat

high: discharge temperature, suction pressure, superheat, subcooling, amperage draw
low: head pressure

97.

Which of the following symptom sets could be from an undercharged system?

high: discharge temperature, superheat
low: head pressure, suction pressure, subcooling

high: discharge temperature, suction pressure, superheat, subcooling, amperage draw
low: head pressure

high: head pressure, discharge temperature, suction pressure, superheat, amperage draw
low: subcooling

high: head pressure, suction pressure, subcooling, amperage draw
low: discharge temperature, superheat

98.

Which of the following symptom sets could be from a system contaminated with non-condensables?

high: discharge temperature, superheat
low: head pressure, suction pressure, subcooling

high: head pressure, suction pressure, subcooling, amperage draw
low: discharge temperature, superheat

high: discharge temperature, suction pressure, superheat, subcooling, amperage draw
low: head pressure

high: head pressure, discharge temperature, suction pressure, superheat, amperage draw
low: subcooling

99.

What could cause the following symptoms?
high: discharge temperature, superheat, subcooling
low: head pressure, suction pressure, amperage draw

refrigerant overcharge

high side restriction

high evaporator airflow

low condensing ambient

100.

Which of the following is not an HFO or HFO Blend refrigerant?

R-452A (Opteon XP44)

R-448A (Opteon XP40, Solstice N40)

R-514A Opteon XP30

R-1234yf (Solstice YF, Opteon YF)

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