HVAC REAL EXAM Questions Questions Correctly
Answered and Updated!!!
Which one of the following units includes equipment necessary to reject the absorbed
heat and reclaim the refrigerant vapor by condensing it back into a liquid? - ANSWER
condensing
The discharge service valve controls which of the following? - ANSWER high pressure
vapor leaving the compressor
The primary factor in the formation of acids and sludge, which can lead to copper
plating and corrosion is _____. - ANSWER moisture
A small window placed in the liquid line on commercial refrigeration systems to provide
a view of the flowing liquid is called the ____ glass. - ANSWER sight
Which of the following refrigeration service wrench type is the most popular for
servicing refrigeration systems? - ANSWER ratchet
The drying agent that is capable of removing acid as well as moisture from refrigerant is
a(n) ______________________________. - ANSWER desicant
What is the correct term for when a suction service valve is turned so the inlet opening
is closed off, preventing refrigerant vapor from entering the valve, but allowing the
gauge port to be open to the compressor? - ANSWER frontseated
All liquids expand when heated and occupy more space. This is called the ____
expansion principle. - ANSWER hydrostatic
,Liquid level in a liquid receiver should never be more than ____% of its capacity when
holding the entire charge of the system - ANSWER 80
A gauge manifold is used to determine refrigeration system ____. - ANSWER pressures
In refrigeration, the device that transfers heat from the warm liquid line to the cool
suction line is called the suction line-liquid heat ____. - ANSWER transfer
The compound gauge is usually blue, and the high-pressure gauge is usually ____. -
ANSWER red
In a capillary tube system, a gurgling sound indicates liquid, but a whistle indicates ____.
- ANSWER vapor
Troubleshooting a solenoid valve is primarily limited to determining whether or not the
coil is ______________________________. - ANSWER energized
An undercharged system prevents the TEV from properly feeding the evaporator, which
results in high ______________________________. - ANSWER superheat
A system that suffers from a lack of refrigerant is ____. - ANSWER undercharged
When cutting a capillary tube, the proper procedure is to use a file or knife blade to
make a ____ in the tubing. - ANSWER notch
Troubleshooting a capillary tube system requires keen use of your eyes, ears, and hands
since the system generally does not have ____ valves. - ANSWER water
, A defective compressor is usually indicated by lower-than-normal discharge pressure
and ______________________________-than-normal suction-line pressure. - ANSWER
higher
The presence of liquid refrigerant in the suction line, resulting from too much liquid
refrigerant being metered into the evaporator, is called
______________________________. - ANSWER overcharged
Suction pressure on capillary tube systems generally changes along with discharge
pressure. When one goes up the other goes ______________________________. -
ANSWER up
A valve that does not maintain a particular setting for any length of time is considered
______________________________. - ANSWER eratic
One method of diagnosing a restriction in a capillary tube is to take a high-pressure
reading and check ____ of the compressor. - ANSWER amperage
High head pressure on a system with head pressure control may be caused by the
following, except ____. - ANSWER refrigerant charge is low
A term used to describe an evaporator that has become totally restricted by frost and
ice buildup is called evaporator ______________________________. - ANSWER freeze-
up
Low head pressure on a system with head pressure control may be caused by the
following, except ____. - ANSWER overcharge of refrigerant
Low head pressure on a system with head pressure control may be caused by the
following, except ____. - ANSWER troubleshooting
Answered and Updated!!!
Which one of the following units includes equipment necessary to reject the absorbed
heat and reclaim the refrigerant vapor by condensing it back into a liquid? - ANSWER
condensing
The discharge service valve controls which of the following? - ANSWER high pressure
vapor leaving the compressor
The primary factor in the formation of acids and sludge, which can lead to copper
plating and corrosion is _____. - ANSWER moisture
A small window placed in the liquid line on commercial refrigeration systems to provide
a view of the flowing liquid is called the ____ glass. - ANSWER sight
Which of the following refrigeration service wrench type is the most popular for
servicing refrigeration systems? - ANSWER ratchet
The drying agent that is capable of removing acid as well as moisture from refrigerant is
a(n) ______________________________. - ANSWER desicant
What is the correct term for when a suction service valve is turned so the inlet opening
is closed off, preventing refrigerant vapor from entering the valve, but allowing the
gauge port to be open to the compressor? - ANSWER frontseated
All liquids expand when heated and occupy more space. This is called the ____
expansion principle. - ANSWER hydrostatic
,Liquid level in a liquid receiver should never be more than ____% of its capacity when
holding the entire charge of the system - ANSWER 80
A gauge manifold is used to determine refrigeration system ____. - ANSWER pressures
In refrigeration, the device that transfers heat from the warm liquid line to the cool
suction line is called the suction line-liquid heat ____. - ANSWER transfer
The compound gauge is usually blue, and the high-pressure gauge is usually ____. -
ANSWER red
In a capillary tube system, a gurgling sound indicates liquid, but a whistle indicates ____.
- ANSWER vapor
Troubleshooting a solenoid valve is primarily limited to determining whether or not the
coil is ______________________________. - ANSWER energized
An undercharged system prevents the TEV from properly feeding the evaporator, which
results in high ______________________________. - ANSWER superheat
A system that suffers from a lack of refrigerant is ____. - ANSWER undercharged
When cutting a capillary tube, the proper procedure is to use a file or knife blade to
make a ____ in the tubing. - ANSWER notch
Troubleshooting a capillary tube system requires keen use of your eyes, ears, and hands
since the system generally does not have ____ valves. - ANSWER water
, A defective compressor is usually indicated by lower-than-normal discharge pressure
and ______________________________-than-normal suction-line pressure. - ANSWER
higher
The presence of liquid refrigerant in the suction line, resulting from too much liquid
refrigerant being metered into the evaporator, is called
______________________________. - ANSWER overcharged
Suction pressure on capillary tube systems generally changes along with discharge
pressure. When one goes up the other goes ______________________________. -
ANSWER up
A valve that does not maintain a particular setting for any length of time is considered
______________________________. - ANSWER eratic
One method of diagnosing a restriction in a capillary tube is to take a high-pressure
reading and check ____ of the compressor. - ANSWER amperage
High head pressure on a system with head pressure control may be caused by the
following, except ____. - ANSWER refrigerant charge is low
A term used to describe an evaporator that has become totally restricted by frost and
ice buildup is called evaporator ______________________________. - ANSWER freeze-
up
Low head pressure on a system with head pressure control may be caused by the
following, except ____. - ANSWER overcharge of refrigerant
Low head pressure on a system with head pressure control may be caused by the
following, except ____. - ANSWER troubleshooting
