CFESA -refrigeration- practice test
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
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
