Refrigeration Machine Operator Practice
Exam Test Guide Questions and
Answers
Which is a disadvantage of a packaged indoor unit - Answer-the potential for excessive
noise exists
Removing oil and filtering refrigerant for reuse is called - Answer-recycle
Which is the best description of temperature - Answer-intensity of heat
The type of head pressure control in a condenser that helps prevent drops in head
pressure is the______ type - Answer-fan cycling, condenser flooding, and damper
control
Which refrigeration system accessory is used to remove moisture, acid, and debris -
Answer-filter drier
Nearly all electronic leaks detector use an element that is sensitive to - Answer-
halogenated gases
All of the following are types of synthetic oil except
a. esters
b. naphthalenes
c. alkylbenzenes
d. glycols - Answer-naphthalenes
All of the following are used in cooling towers to spread the water for more efficient
cooling except for
a. fill material
b. a distribution pan
c. an expansion valve
d. sprays - Answer-an expansion valve
The one major difference between a low-pressure chiller and a high-pressure chiller is
the _____ system - Answer-purge
Which is most likely to cause low to no superheat - Answer-thermostatic expansion
valve overfeeding
What does purging do in absorption machines - Answer-removes noncondensables
Which is false concerning azeotropic refrigerants
, a. they behave as pure compounds
b. they act as on refrigerant in all conditions
c. they are subject to fractionation
d. they are a blend of multiple components - Answer-they are subject to fractionation
Which condenser contains a number of straight tubes through which the cooling water is
circulated while the refrigerant vapor surrounds the tube bundle - Answer-horizontal-
shell-and-tube
Which type of cooling tower fill material design that spreads the water evenly to form
thin layers - Answer-film type
A defrost cycle is required for a(n) - Answer-air-to-air heat pump
With regard to cooling towers, which device is necessary for a closed loop system but
not for an open loop system - Answer-heat exchanger
Transformers have a(n) ______ rating that should never be exceeded -
Answer-volt/amp (VA)
A suction accumulator is used to prevent ______ refrigerant from entering the suction
side of the _______ - Answer-liquid: compressor
A plate type evaporator is - Answer-made up of two flat metal pieces seamed together
with liquid refrigerant flowing through a tube between the pieces
Which best describes a liquid bulb charge - Answer-most liquid charge that is the same
as the refrigerant in the system and remains partially liquid as the refrigerant boils and
vaporizes
In a split system, the indoor section typically consist of the evaporator, fan, ________,
and a connection for the suction and liquid lines - Answer-a metering device
a reciprocating compressor increases the pressure of the refrigerant by ________ the
volume of the compression chamber - Answer-lowering
Which is the best definition of radiation - Answer-the transferring of heat from a warm
substance to a cooler substance without heating the medium
The fusible plug type of pressure relief device works by responding to _______ -
Answer-high temperature
The low pressure safety cut out stops the refrigeration equipment at a predetermined -
Answer-minimum operating pressure
Exam Test Guide Questions and
Answers
Which is a disadvantage of a packaged indoor unit - Answer-the potential for excessive
noise exists
Removing oil and filtering refrigerant for reuse is called - Answer-recycle
Which is the best description of temperature - Answer-intensity of heat
The type of head pressure control in a condenser that helps prevent drops in head
pressure is the______ type - Answer-fan cycling, condenser flooding, and damper
control
Which refrigeration system accessory is used to remove moisture, acid, and debris -
Answer-filter drier
Nearly all electronic leaks detector use an element that is sensitive to - Answer-
halogenated gases
All of the following are types of synthetic oil except
a. esters
b. naphthalenes
c. alkylbenzenes
d. glycols - Answer-naphthalenes
All of the following are used in cooling towers to spread the water for more efficient
cooling except for
a. fill material
b. a distribution pan
c. an expansion valve
d. sprays - Answer-an expansion valve
The one major difference between a low-pressure chiller and a high-pressure chiller is
the _____ system - Answer-purge
Which is most likely to cause low to no superheat - Answer-thermostatic expansion
valve overfeeding
What does purging do in absorption machines - Answer-removes noncondensables
Which is false concerning azeotropic refrigerants
, a. they behave as pure compounds
b. they act as on refrigerant in all conditions
c. they are subject to fractionation
d. they are a blend of multiple components - Answer-they are subject to fractionation
Which condenser contains a number of straight tubes through which the cooling water is
circulated while the refrigerant vapor surrounds the tube bundle - Answer-horizontal-
shell-and-tube
Which type of cooling tower fill material design that spreads the water evenly to form
thin layers - Answer-film type
A defrost cycle is required for a(n) - Answer-air-to-air heat pump
With regard to cooling towers, which device is necessary for a closed loop system but
not for an open loop system - Answer-heat exchanger
Transformers have a(n) ______ rating that should never be exceeded -
Answer-volt/amp (VA)
A suction accumulator is used to prevent ______ refrigerant from entering the suction
side of the _______ - Answer-liquid: compressor
A plate type evaporator is - Answer-made up of two flat metal pieces seamed together
with liquid refrigerant flowing through a tube between the pieces
Which best describes a liquid bulb charge - Answer-most liquid charge that is the same
as the refrigerant in the system and remains partially liquid as the refrigerant boils and
vaporizes
In a split system, the indoor section typically consist of the evaporator, fan, ________,
and a connection for the suction and liquid lines - Answer-a metering device
a reciprocating compressor increases the pressure of the refrigerant by ________ the
volume of the compression chamber - Answer-lowering
Which is the best definition of radiation - Answer-the transferring of heat from a warm
substance to a cooler substance without heating the medium
The fusible plug type of pressure relief device works by responding to _______ -
Answer-high temperature
The low pressure safety cut out stops the refrigeration equipment at a predetermined -
Answer-minimum operating pressure
