Refrigeration Test Exam Questions And
Verified Answers 2025(Graded A+) Detailed
Answers
Automatic expansion valves work with
Evaporator pressure closes valve spring pressure opens valve
A faulty check in a pump will cause the most damage on
Startup
If the T E V's sensing bulb falls off the suction line you will
Flood the evaporator
A clogged condenser pump strainer can cause a loss of
pressure causing
High condenser head pressure
A solenoid valve is part of the pump down cycle
Thermostat solenoid valve and then the low pressure control
What is proper start up procedure?
Start chiller water pump, start condenser water pump,check tower
fans, check compressor oil, check position of refrigeration valves,
start machine.
A reciprocating machine cycles multistage compressors on
and off with the
Low pressure control
The refrigerant that has the best refrigerant effect is
Ammonia
In an induced draft cooling tower that is operating efficiently
the leaving water temp is at
Some temp between the prevailing dry and wet bulb temp
A sudden reduction in the supply of condenser water could
result in
An open valve
,Reciprocating compressor unloaders work by
Keeping compression suction valve open
In a well designed system the percent of lubricant circulated
should not exceed
10%
Oil foaming in the compressor is a result of
Liquid refrigerant in the crankcase
The main reason for installing a oil separator on the
discharge line is to
Return oil back to the compressor crankcase
In a reciprocating compressor using the splash system for
lubrication the domain of oil is caused by a
Sudden decrease in pressure
Charge vapor into the
Suction side of the compressor (low side)
Oil in a refrigerant system reduces
Wear and friction
A filter drier is used to
Remove moister
Oil separator is located on the discharge line as
Far from the compressor as possible
A solenoid valve
Does not vary the flow of refrigerant
The T E V
Modulates and controls the flow of refrigerant into the evaporator
If you use an automatic expansion valve with a variable load
you will
Starve the evaporator
A motor has 4 belts if one is worn replace
All the belts
Non condensable gases can cause
High head pressure
Horse power will
, Increase as the head pressure increases
Horse power will
Decrease as the head pressure decreases
Superheated vapor is defined as a
Dry vapor
A sling psychrometer is used to measure
Relative humidity
An automatic expansion valve maintains a
Constant evaporator pressure
If the evaporator doesn't respond to adjustments of the T E V
it may be due
To oil logged on the low side
When using a bribe solution in a system us
Di-chromate tablets to prevent rusting
If a halide torch turns yellow it is caused by
A clogged sample tube
The pressure of having 2 compressors in a cascade system
is to operate at
Very low temperatures
A pressure relief valve is better than a fusible plug because a
Fusible plug can not reseat
Compressor knocking could be caused by
Refrigerant slugging in the compressor
If the TEV's spring was to break it would
Flood the evaporator and raise suction pressure
The T E V of equalizer line makes up for the
Pressure drop in the evaporator
When installing pipe and you need a 90 degree elbow use a
Factory made 90 degree elbow and braze it in
A service valve stem cap protects the valve from being
Inadvertently turned from its position and from being damaged
Semi hermetic compressors have the advantage over
hermetic compressors because
Verified Answers 2025(Graded A+) Detailed
Answers
Automatic expansion valves work with
Evaporator pressure closes valve spring pressure opens valve
A faulty check in a pump will cause the most damage on
Startup
If the T E V's sensing bulb falls off the suction line you will
Flood the evaporator
A clogged condenser pump strainer can cause a loss of
pressure causing
High condenser head pressure
A solenoid valve is part of the pump down cycle
Thermostat solenoid valve and then the low pressure control
What is proper start up procedure?
Start chiller water pump, start condenser water pump,check tower
fans, check compressor oil, check position of refrigeration valves,
start machine.
A reciprocating machine cycles multistage compressors on
and off with the
Low pressure control
The refrigerant that has the best refrigerant effect is
Ammonia
In an induced draft cooling tower that is operating efficiently
the leaving water temp is at
Some temp between the prevailing dry and wet bulb temp
A sudden reduction in the supply of condenser water could
result in
An open valve
,Reciprocating compressor unloaders work by
Keeping compression suction valve open
In a well designed system the percent of lubricant circulated
should not exceed
10%
Oil foaming in the compressor is a result of
Liquid refrigerant in the crankcase
The main reason for installing a oil separator on the
discharge line is to
Return oil back to the compressor crankcase
In a reciprocating compressor using the splash system for
lubrication the domain of oil is caused by a
Sudden decrease in pressure
Charge vapor into the
Suction side of the compressor (low side)
Oil in a refrigerant system reduces
Wear and friction
A filter drier is used to
Remove moister
Oil separator is located on the discharge line as
Far from the compressor as possible
A solenoid valve
Does not vary the flow of refrigerant
The T E V
Modulates and controls the flow of refrigerant into the evaporator
If you use an automatic expansion valve with a variable load
you will
Starve the evaporator
A motor has 4 belts if one is worn replace
All the belts
Non condensable gases can cause
High head pressure
Horse power will
, Increase as the head pressure increases
Horse power will
Decrease as the head pressure decreases
Superheated vapor is defined as a
Dry vapor
A sling psychrometer is used to measure
Relative humidity
An automatic expansion valve maintains a
Constant evaporator pressure
If the evaporator doesn't respond to adjustments of the T E V
it may be due
To oil logged on the low side
When using a bribe solution in a system us
Di-chromate tablets to prevent rusting
If a halide torch turns yellow it is caused by
A clogged sample tube
The pressure of having 2 compressors in a cascade system
is to operate at
Very low temperatures
A pressure relief valve is better than a fusible plug because a
Fusible plug can not reseat
Compressor knocking could be caused by
Refrigerant slugging in the compressor
If the TEV's spring was to break it would
Flood the evaporator and raise suction pressure
The T E V of equalizer line makes up for the
Pressure drop in the evaporator
When installing pipe and you need a 90 degree elbow use a
Factory made 90 degree elbow and braze it in
A service valve stem cap protects the valve from being
Inadvertently turned from its position and from being damaged
Semi hermetic compressors have the advantage over
hermetic compressors because
