HVACR 221 MID TERM TEST
In a kitchen, ____ condensing units may be easier to maintain. - Answers- remote
The three-way heat reclaim valves in most heat reclaim systems are ____ operated. -
Answers- solenoid
The heat reclaim valve is a three-way valve that is activated by a solenoid operated by a
____. - Answers- pilot
When a parallel heat reclaim system is used, the heat reclaim condenser must be sized
to handle ____% of the refrigeration system's rejected heat when in the heat reclaim
mode. - Answers- 100
Heaters that are made with resistance-type wire run just under the surface of the
cabinet are called ____ heaters. - Answers- mullion
Knock-down walk-in coolers are constructed of interlocking panels from ____ thick. -
Answers- 1 in. to 4 in.
Refrigerated compressed air driers typically run ____% of the time. - Answers- 100
The primary advantage of parallel compressor systems is their ____. - Answers- nearly
exact load matching ability
The air used for "pneumatic controls" must be ____. - Answers- dry
When purchase cost alone is considered in selecting refrigeration equipment, the
equipment may not perform acceptably. - Answers- True
An open case is more efficient than a closed case. - Answers- False
Self-contained equipment normally plugs into either a 120-V or 230-V electrical outlet. -
Answers- True
Often, parallel compressor systems employ a satellite or booster compressor. -
Answers- True
Carbon dioxide (CO2) is one of the newest refrigerants. - Answers- False
CO2, ammonia, propane, butane, and isobutane are all natural refrigerants. - Answers-
True
Distributed supermarket refrigeration modules that are located very close to the display
cases they refrigerate are becoming increasingly popular. - Answers- True
, Refrigerated air driers are normally self-contained refrigeration systems that may be air
cooled or water cooled. - Answers- True
Retail stores use ____________________ refrigeration units for merchandising their
products. - Answers- reach in cooler
All refrigeration equipment must have some means for disposing of the
____________________ that is gathered on the evaporator. - Answers- condensate
When the inside of the evaporator cabinet is below freezing, heat has to be provided to
keep the condensate in the line ____________________. - Answers- from freezing
Where can a condensing unit be located? - Answers- at the case
outside
in a crawl space
ALL OF THE ABOVE ARE CORRECT
Pilot valve operation means. - Answers- a valve is actuated by a smaller valve using a
solenoid and system pressure to move the larger valve
In condensate removal, the drain lines should be sloped downward about ____ in. per
foot for proper drainage. - Answers- 1/4
The precharged tubing used for installing refrigeration piping is called a ____. -
Answers- line set
One of the advantages of parallel compressor systems is ____. - Answers- load
matching
flexibility
less compressor cycling
ALL OF THE ABOVE ARE CORRECT
The most popular secondary fluid currently used in refrigeration systems is ____. -
Answers- propylene glycol
One of the disadvantages of the secondary-fluid refrigeration systems is ____. -
Answers- higher cost of the equipment
The normal condenser and the heat reclaim condenser used when in the heat reclaim
mode in a series heat reclaim system equally share the job of condensing of the
refrigerant in the system - Answers- False
Two common means of disposing of the condensate that is gathered on the evaporator
of all refrigeration equipment is heat dissipation with electric pan heaters or hot
discharge piping from the compressor and being piped or pumped to a drain - Answers-
True
In a kitchen, ____ condensing units may be easier to maintain. - Answers- remote
The three-way heat reclaim valves in most heat reclaim systems are ____ operated. -
Answers- solenoid
The heat reclaim valve is a three-way valve that is activated by a solenoid operated by a
____. - Answers- pilot
When a parallel heat reclaim system is used, the heat reclaim condenser must be sized
to handle ____% of the refrigeration system's rejected heat when in the heat reclaim
mode. - Answers- 100
Heaters that are made with resistance-type wire run just under the surface of the
cabinet are called ____ heaters. - Answers- mullion
Knock-down walk-in coolers are constructed of interlocking panels from ____ thick. -
Answers- 1 in. to 4 in.
Refrigerated compressed air driers typically run ____% of the time. - Answers- 100
The primary advantage of parallel compressor systems is their ____. - Answers- nearly
exact load matching ability
The air used for "pneumatic controls" must be ____. - Answers- dry
When purchase cost alone is considered in selecting refrigeration equipment, the
equipment may not perform acceptably. - Answers- True
An open case is more efficient than a closed case. - Answers- False
Self-contained equipment normally plugs into either a 120-V or 230-V electrical outlet. -
Answers- True
Often, parallel compressor systems employ a satellite or booster compressor. -
Answers- True
Carbon dioxide (CO2) is one of the newest refrigerants. - Answers- False
CO2, ammonia, propane, butane, and isobutane are all natural refrigerants. - Answers-
True
Distributed supermarket refrigeration modules that are located very close to the display
cases they refrigerate are becoming increasingly popular. - Answers- True
, Refrigerated air driers are normally self-contained refrigeration systems that may be air
cooled or water cooled. - Answers- True
Retail stores use ____________________ refrigeration units for merchandising their
products. - Answers- reach in cooler
All refrigeration equipment must have some means for disposing of the
____________________ that is gathered on the evaporator. - Answers- condensate
When the inside of the evaporator cabinet is below freezing, heat has to be provided to
keep the condensate in the line ____________________. - Answers- from freezing
Where can a condensing unit be located? - Answers- at the case
outside
in a crawl space
ALL OF THE ABOVE ARE CORRECT
Pilot valve operation means. - Answers- a valve is actuated by a smaller valve using a
solenoid and system pressure to move the larger valve
In condensate removal, the drain lines should be sloped downward about ____ in. per
foot for proper drainage. - Answers- 1/4
The precharged tubing used for installing refrigeration piping is called a ____. -
Answers- line set
One of the advantages of parallel compressor systems is ____. - Answers- load
matching
flexibility
less compressor cycling
ALL OF THE ABOVE ARE CORRECT
The most popular secondary fluid currently used in refrigeration systems is ____. -
Answers- propylene glycol
One of the disadvantages of the secondary-fluid refrigeration systems is ____. -
Answers- higher cost of the equipment
The normal condenser and the heat reclaim condenser used when in the heat reclaim
mode in a series heat reclaim system equally share the job of condensing of the
refrigerant in the system - Answers- False
Two common means of disposing of the condensate that is gathered on the evaporator
of all refrigeration equipment is heat dissipation with electric pan heaters or hot
discharge piping from the compressor and being piped or pumped to a drain - Answers-
True
