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WorksheetsHVAC 104
Total questions: 20
Worksheet time: 10mins
A TXV with a liquid charged bulb is usually limited to ____________.
high temperature applications
applications where the ambient air temperature stays above freezing
applications that have a narrow operating range
systems that operate below atmospheric pressure
What is the primary function of a TXV in a refrigeration system?
To control the flow of refrigerant into the evaporator
To control the temperature of the refrigerant
To control the pressure of the refrigerant
To control the humidity of the refrigerant
What could be a possible issue if a TXV is not properly adjusted?
The refrigerant flow could be too high, causing the evaporator to flood
The refrigerant flow could be too low, causing the evaporator to starve
Both A and B
None of the above
What type of charge is used in a TXV with a gas charged bulb?
High temperature applications
Applications where the ambient air temperature stays above freezing
Applications that have a narrow operating range
Systems that operate below atmospheric pressure
The spring tension on a TXV is factory set for a predetermined superheat of _____ °F.
8-12
10-20
3-6
8-16
Any evaporator that operates below 32°F ______________.
needs a thermostat
does not need defrost
requires some form of defrost
no such thing
Refrigerant relief valves come in two different types, ___________.
spring loaded and double tap
Spring loaded and one time
fixed or variable
expensive and cheap
A control that can be used as either a low-charge protection or to control space temperature is a __________.
High switch
High pressure switch
Low switch
Low pressure switch
What is the function of a refrigerant relief valve in a refrigeration system?
To control the flow of refrigerant into the evaporator
To release excess pressure from the system
To control the temperature of the refrigerant
To control the humidity of the refrigerant
During an automatic pumpdown, the refrigerant is stored in the ___________.
Receiver /condenser
Compressor
evaporator
TXV
A ___________ is used to keep the compressor from operating with high head pressure.
control
High pressure control
Pressure switch
Low pressure switch
Reach-in refrigeration fixtures can be either _________.
Walk in or cabinet
Top or bottom
Self contained or split system with a remote condenser
Rack or package system
The mixing of hot gas with subcooled or saturated liquid could cause ________.
Liquid hammer
vapor hammer
Steam hammer
Liquid and vapor hammer
CO2, ammonia, propane, butane, and isobutane are all types of _________.
Synthetic refrigerants
HCFC refrigerants
Fake refrigerants
Natural refrigerants
A refrigerant that has a both a Global Warming Potential (GWP) and an Ozone Depletion Potential (ODP) of 0 is ______.
R-717
R-404A
R-22
R-410A
Walk-in refrigeration equipment is either ___________ type.
Still or permanent
Knock-down or permanent
Welded or permanent
Upright or permanent
To remove condensate, self-contained equipment can _______.
evaporate it using heat given off by the compressor
Evaporate it using heat from the condenser
Evaporate it using heat from the evaporator
Evaporate it using ambient temperature
The two forces that control the EPR valve are the __________.
Compressor pressure
Liquid line pressure
evaporator pressure and the valve’s spring pressure
Condenser and liquid line pressure
A _________ has a magnetic coil, can be normally open or normally closed, and is frequently used to control fluid flow (liquid or vapor).
An electronic valve
A solenoid valve
A combination of electrons and protons
A king valve
Net oil pressure is the pressure that can be measured at the discharge or outlet of the oil pump.
Maybe
It depends on thetype of oil
True
False
