RI JOURNEYMAN CORE EXAM SET QUESTIONS AND
ANSWERS GRADED A+
✔✔____________________________ Is called the ambient temperature. - ✔✔The
temperature of the air that surrounds any object
✔✔The highest temperature at which vapor can be liquified regardless of the pressure
applied is called ___________________ - ✔✔the critical temperature of a substance.
✔✔The critical pressure of a substance is the pressure at which ____________ - ✔✔a
liquid cannot become a vapor by adding heat.
✔✔The boiling point of water ______________ when salt is added - ✔✔increases
✔✔Heat travels in accordance with the __________________ - ✔✔second law of
thermodynamics.
✔✔One degree day is __________________________ - ✔✔computed by taking the
average of the highest and lowest temperatures recorded for a given day and
subtracting it from 65 deg. F
✔✔The term "Volumetric Efficiency" is the ___________________ - ✔✔actual volume
of vapor pumped divided by the calculated volume.
✔✔Refrigerant having either Chorine or Fluorine __________________ when in contact
with flame. - ✔✔can break down to phosgene
✔✔Absolute pressure is _____________ - ✔✔Gauge pressure plus 15
✔✔___________ must not be used in any refrigeration system that contains
halogenated refrigerant. - ✔✔Magnesium
✔✔Pressure vessels having a maximum design pressure of 15 psig must be strong
enough to ________________ - ✔✔withstand at least 3 times the design pressure and
be tested to 1 1/3 times pressure for which they are rated.
✔✔The minimum design pressure for a refrigeration system can not be less than
____________ - ✔✔15 psig
✔✔A systems design pressure must not be less than the saturation pressure of the
refrigerant at ____________ - ✔✔80 deg. F. on the low side and 125 deg. F. on the
high side for an air cooled systems.
,✔✔When the compressor is idle, the intended volume and total refrigerant charge are
such that the design pressure will not be exceeded by the complete evaporation of the
refrigerant. - ✔✔This is called a limited charge system.
✔✔______________ when the receiver is protected with a pressure relief on a limited
charge system. - ✔✔The design pressure of the receiver need not exceed the setting on
the pressure relief
✔✔The ultimate bursting pressure of the receiver - ✔✔need not exceed the critical
pressure of the refrigerant unless the system is intended to operate in these conditions.
✔✔The evaporator used for central air conditioning can be located - ✔✔on either the
return air side or the hot air side, whichever is more convenient, or in the return air on
top of a blower cabinet attached to a hot air gravity furnace.
✔✔In a sealed system as the pressure increases _____________ - ✔✔the temperature
increases.
✔✔______________ is called the eutectic point - ✔✔Freezing temperature of a certain
solution
✔✔Excess superheat in the system added that must be removed before condensation
in the condenser can take place is ________________ - ✔✔at the end of the
evaporator and in the condenser.
✔✔The plate type of evaporator coil _______________ - ✔✔is commonly used with a
manual shutdown type of defrost system.
✔✔When using a manual shutdown defrost system the evaporator coil usually operates
____________________ - ✔✔below 32 degrees F.
✔✔Three common supplementary heat methods used in the removal of frost on a
evaporator coil are, __________________ - ✔✔warm water, electric, and hot gas.
✔✔The gas defrost system line connects ______________ - ✔✔from the inlet of the
condenser to the inlet of the evaporator.
✔✔The component that is commonly added to the hot gas defrost system that is not on
a warm water defrost system is an _____________ - ✔✔accumulator.
✔✔The _________ is the part of the air conditioning system that changes the
refrigerant from a low-pressure gas into a high-pressure gas. - ✔✔compressor
, ✔✔The ___________ is the part of the air conditioning system that changes the
refrigerant from a high-pressure gas to a high-pressure liquid. - ✔✔condenser
✔✔The ____________ is the part of the air conditioning system that changes the
refrigerant from a low-pressure liquid into a low-pressure gas. - ✔✔evaporator
✔✔The _________________ is the part of the air conditioning system that changes
refrigerant from a high-pressure liquid to a low-pressure liquid - ✔✔metering device
✔✔____________ is the part of the system that stores refrigerant until it is needed in
the evaporator - ✔✔The receiver
✔✔_____________ is the part of the system that prevents liquids from entering the
compressor. - ✔✔The accumulator
✔✔A split system air conditioning unit has - ✔✔the compressor and condenser
connected by a refrigeration line set to the metering device and evaporator.
✔✔In a sealed system __________________ the pressure increases - ✔✔as the
temperature increases
✔✔It is recommended to add gravel fill under the pad of a condensing unit as - ✔✔this
will prevent settling of the ground which can cause refrigerant line damage.
✔✔The "R" terminal used for ____________________ on the thermostat. - ✔✔power
from the transformer.
✔✔The "W" terminal used for the thermostat is for - ✔✔the heating control circuit.
✔✔The "Y" terminal used for ____________________on the thermostat. - ✔✔the
cooling contactor coil
✔✔The "G" terminal used for ____________ on the thermostat. - ✔✔the blower relay
coil
✔✔the purpose for insulating a suction line is to ______________ - ✔✔prevent
condensation from forming.
✔✔When installing a refrigeration line set through a masonry wall _________________
- ✔✔the lines must be covered by PVC to prevent contact with the masonry material.
ANSWERS GRADED A+
✔✔____________________________ Is called the ambient temperature. - ✔✔The
temperature of the air that surrounds any object
✔✔The highest temperature at which vapor can be liquified regardless of the pressure
applied is called ___________________ - ✔✔the critical temperature of a substance.
✔✔The critical pressure of a substance is the pressure at which ____________ - ✔✔a
liquid cannot become a vapor by adding heat.
✔✔The boiling point of water ______________ when salt is added - ✔✔increases
✔✔Heat travels in accordance with the __________________ - ✔✔second law of
thermodynamics.
✔✔One degree day is __________________________ - ✔✔computed by taking the
average of the highest and lowest temperatures recorded for a given day and
subtracting it from 65 deg. F
✔✔The term "Volumetric Efficiency" is the ___________________ - ✔✔actual volume
of vapor pumped divided by the calculated volume.
✔✔Refrigerant having either Chorine or Fluorine __________________ when in contact
with flame. - ✔✔can break down to phosgene
✔✔Absolute pressure is _____________ - ✔✔Gauge pressure plus 15
✔✔___________ must not be used in any refrigeration system that contains
halogenated refrigerant. - ✔✔Magnesium
✔✔Pressure vessels having a maximum design pressure of 15 psig must be strong
enough to ________________ - ✔✔withstand at least 3 times the design pressure and
be tested to 1 1/3 times pressure for which they are rated.
✔✔The minimum design pressure for a refrigeration system can not be less than
____________ - ✔✔15 psig
✔✔A systems design pressure must not be less than the saturation pressure of the
refrigerant at ____________ - ✔✔80 deg. F. on the low side and 125 deg. F. on the
high side for an air cooled systems.
,✔✔When the compressor is idle, the intended volume and total refrigerant charge are
such that the design pressure will not be exceeded by the complete evaporation of the
refrigerant. - ✔✔This is called a limited charge system.
✔✔______________ when the receiver is protected with a pressure relief on a limited
charge system. - ✔✔The design pressure of the receiver need not exceed the setting on
the pressure relief
✔✔The ultimate bursting pressure of the receiver - ✔✔need not exceed the critical
pressure of the refrigerant unless the system is intended to operate in these conditions.
✔✔The evaporator used for central air conditioning can be located - ✔✔on either the
return air side or the hot air side, whichever is more convenient, or in the return air on
top of a blower cabinet attached to a hot air gravity furnace.
✔✔In a sealed system as the pressure increases _____________ - ✔✔the temperature
increases.
✔✔______________ is called the eutectic point - ✔✔Freezing temperature of a certain
solution
✔✔Excess superheat in the system added that must be removed before condensation
in the condenser can take place is ________________ - ✔✔at the end of the
evaporator and in the condenser.
✔✔The plate type of evaporator coil _______________ - ✔✔is commonly used with a
manual shutdown type of defrost system.
✔✔When using a manual shutdown defrost system the evaporator coil usually operates
____________________ - ✔✔below 32 degrees F.
✔✔Three common supplementary heat methods used in the removal of frost on a
evaporator coil are, __________________ - ✔✔warm water, electric, and hot gas.
✔✔The gas defrost system line connects ______________ - ✔✔from the inlet of the
condenser to the inlet of the evaporator.
✔✔The component that is commonly added to the hot gas defrost system that is not on
a warm water defrost system is an _____________ - ✔✔accumulator.
✔✔The _________ is the part of the air conditioning system that changes the
refrigerant from a low-pressure gas into a high-pressure gas. - ✔✔compressor
, ✔✔The ___________ is the part of the air conditioning system that changes the
refrigerant from a high-pressure gas to a high-pressure liquid. - ✔✔condenser
✔✔The ____________ is the part of the air conditioning system that changes the
refrigerant from a low-pressure liquid into a low-pressure gas. - ✔✔evaporator
✔✔The _________________ is the part of the air conditioning system that changes
refrigerant from a high-pressure liquid to a low-pressure liquid - ✔✔metering device
✔✔____________ is the part of the system that stores refrigerant until it is needed in
the evaporator - ✔✔The receiver
✔✔_____________ is the part of the system that prevents liquids from entering the
compressor. - ✔✔The accumulator
✔✔A split system air conditioning unit has - ✔✔the compressor and condenser
connected by a refrigeration line set to the metering device and evaporator.
✔✔In a sealed system __________________ the pressure increases - ✔✔as the
temperature increases
✔✔It is recommended to add gravel fill under the pad of a condensing unit as - ✔✔this
will prevent settling of the ground which can cause refrigerant line damage.
✔✔The "R" terminal used for ____________________ on the thermostat. - ✔✔power
from the transformer.
✔✔The "W" terminal used for the thermostat is for - ✔✔the heating control circuit.
✔✔The "Y" terminal used for ____________________on the thermostat. - ✔✔the
cooling contactor coil
✔✔The "G" terminal used for ____________ on the thermostat. - ✔✔the blower relay
coil
✔✔the purpose for insulating a suction line is to ______________ - ✔✔prevent
condensation from forming.
✔✔When installing a refrigeration line set through a masonry wall _________________
- ✔✔the lines must be covered by PVC to prevent contact with the masonry material.
