Refrigeration System Accessories Pretest Quiz Flashcards
Relief valves are installed in a refrigeration system to ____.
distribute high-pressure liquid refrigerant to separate metering devices
control the flow of refrigerant through system piping
control refrigerant flow through liquid risers and suction risers
prevent equipment damage or personal injury by venting refrigerant
prevent equipment damage or personal injury by venting refrigerant
Refrigerant line valves on a commercial refrigeration system ____.
bypass refrigerant from high to low sides
are installed at the inlet or outlet of the liquid receiver
control the flow of refrigerant through system piping
are usually installed on the liquid receiver above the liquid level
control the flow of ref through system piping
Check valves that open insufficiently will ____.
allow excessive refrigerant flow
act as a throttling device and create a pressure drop
function to stabilize system operation
All of the above.
act as a throttling device and create a pressure drop
Valves that are used to permit fluid flow in only one direction are ____.
riser valves
service valves
check valves
manifold valves
check valves
Condenser pressure regulators and receiver pressure regulators are primarily used to ____.
raise high-side pressure
equalize pressure during the Off cycle
lower high-side pressure
prevent compressor overload
raise high-head pressure
A single-body, combination condenser-receiver pressure regulator that regulates both condenser and liquid receiver pressures is a ____ control.
low-ambient
condenser splitting
liquid line
liquid injection
low-ambient
Receiver pressure regulators ____.
open on a rise of inlet pressure
negate the need for a liquid line solenoid valve
open on a rise in pressure difference between a discharge line and a liquid receiver
None of the above.
open on a rise in pressure difference between a discharge line and a liquid receiver
Condenser splitting is a method of head pressure control that makes use of ____.
electric heating elements
a supplementary booster compressor
reduced volume
All of the above.
reduced volume
Solenoid valves are controlled by ____.
an electric signal
high-side pressure
low-side suction
cemf
an electrical signal
Bubbles in a sight glass may indicate ____.
a shortage of refrigerant
a partially clogged filter-drier
Both A and B.
Neither A nor B.
Both A and B
After a compressor burnout, temporarily install a new ____ to protect the compressor for the duration of the cleanup.
suction line filter-drier
liquid line filter-drier
sight glass
relief valve
suction line filter-drier
The condenser pressure regulator and receiver pressure regulator work together to maintain head pressure on the ____.
high side of the system in higher outdoor temperatures
low side of the system in low outdoor temperatures
high side of the system in low outdoor temperatures
low side of the system in higher outdoor temperatures
high side of the system in low outdoor temperatures
The condenser pressure regulator closes when condenser pressure is ____.
less than the pressure exerted by the regulator’s adjustable spring
more than the pressure exerted by the regulator’s adjustable spring
equal to the pressure exerted by the regulator’s adjustable spring
None of the above.
less than the pressure exerted by the regulator’s adjustable spring
A valve with an adjustable pressure setting that prevents compressor inlet pressure from exceeding a preset safe value is a ____.
crankcase pressure regulator
evaporator pressure regulator
condenser pressure regulator
receiver pressure regulator
crankcase pressure regulator
The ___________ is to protect form excessive head pressure.
EPR
CPR
Low Pressure Control
High Pressure Control
low pressure control
The ________ is to prevent an evaporator from going below a predetermined pressure.
EPR
OROA
CPR
ORD
EPR
The ____________ is to prevent excessive oil circulation in the refrigerant.
suction line trap
Oil separator
Solenoid valve
Solenoid valve
oil separator
The ________ is to prevent migration of refrigerant within the refrigeration system
Accumulator
Receiver
Check valve
Crankcase heater
crankcase heater
The liquid line connects the ________________ to the __________
Metering Device - Evaporator
Compressor - metering device
Condenser - metering device
Compressor - condenser
condenser - metering device
The __________ is the mechanism used to pump oil in the compressor for lubrication purposes.
Cylinder
Oil check valve
Oil reservoir
oil pump
oil pump
One of the two types of filter-drier shells is the
Silica gel
Changeable core type
Molecular sieve
Beaded type
changeable core type
The purpose of the ________ is to remove contaminants and moisture from the refrigerant in the system.
Service valve
Sight glass
Check valve
Filter-drier
filter drier
Most oil separators use a float which
Opens access to the return line when enough oil collects
Opens access to the return line when the oil level is too low
Opens access to the inlet when enough oil collects
Closes access to the return line when enough oil collects
Open access to the return line when enough oil collects
The purpose of the ________ al1ows access to the suction or discharge line for gauge pressure or isolating the compressor.
Sight glass
Filter-drier
Solenoid valve
Service valve
Service valve
