Refrigeration Test Exam Questions And
Verified Answers Top Rated A+
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
They can be serviced on site
When using a portable compressor recovery unit to remove
vapor the
Vapor density is decreased
The amount of pressure that flows through the orifice plates
is determined by the
Difference in pressure between the high and low size
If you were running three compressors the state of
refrigerant leaving the third compressor is a
Superheated vapor
,A T E V restricts the amount of refrigerant from the
High side to the low side
A halid torch burns from
Blue to dark blue or purple when a week is detected
The main reason for a crankcase breather line is to prevent
Oil from slugging in the compressor
The middle port on a manifold gauges is connected to the
Recovery cylinder or the charging cylinder
A forced draft cooling tower is better then a natural draft
because it is
Smaller and not affected by prevailing winds
The proper way to start a pump is to
Open the suction valve and close the discharge valve start the
pump and then slowly throttle open the discharge valve (seasonal
start up)
Fusible plug setting is
280°
The flashpoint of compressor lube oil is
Higher than the compressor temperature
Heat removed from the refrigerator in the condenser is
Sensible and latent heat
A compressor safety head is a
Valve plate help down by a heavy spring
A centrifugal machine is characterized by
High volume and low pressure
If condenser pressure is high and another pump has to be
turned on you would have the
Suction valve completely opened and discharge valve open to a
throttled position
If you disconnect the external equalizer on a T E V you would
Flood the evaporator
You achieve capacity control on a reciprocating compressor
by
, Opening suction valves by using some form of control
The ratio of actual water vapor in the atmosphere to the
saturation pressure is called
Relative humidity
The most accurate statement regarding compressor motors
that run in a refrigerant atmosphere is that they use
Material tailored to the refrigerant
MUNTZ
Material should not be used with ammonia
Venting a manifold or purge line is prohibited with any
Refrigerant containing chlorine. (HCFC CFC)
You would not use a solenoid valve to
Vary the flow of refrigerant
The muffler is located between the
Compressor in the condenser
Refrigerant affect is always lower than latent heat because
Heat required to cool the refrigerant from compressor discharge
to evaporator temperature is subtracted from the latent heat
You use a T E V with an external equalizer when there is
more than
2.5 pressure drop through the evaporator coil
Direct systems
Are most likely to week refrigerant into building spaces
Gauges on the high side should be graduated to
At least 1.2 times the design pressure
When brazing in a class T machine room you must in sure
the flame is
Enclosed invented to open air
In an emergency you can dump refrigerant under
FDNY supervision
An R-22 system's head pressure with a condenser water
supply temperature of 85° is
200-215 p s I g
Verified Answers Top Rated A+
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
They can be serviced on site
When using a portable compressor recovery unit to remove
vapor the
Vapor density is decreased
The amount of pressure that flows through the orifice plates
is determined by the
Difference in pressure between the high and low size
If you were running three compressors the state of
refrigerant leaving the third compressor is a
Superheated vapor
,A T E V restricts the amount of refrigerant from the
High side to the low side
A halid torch burns from
Blue to dark blue or purple when a week is detected
The main reason for a crankcase breather line is to prevent
Oil from slugging in the compressor
The middle port on a manifold gauges is connected to the
Recovery cylinder or the charging cylinder
A forced draft cooling tower is better then a natural draft
because it is
Smaller and not affected by prevailing winds
The proper way to start a pump is to
Open the suction valve and close the discharge valve start the
pump and then slowly throttle open the discharge valve (seasonal
start up)
Fusible plug setting is
280°
The flashpoint of compressor lube oil is
Higher than the compressor temperature
Heat removed from the refrigerator in the condenser is
Sensible and latent heat
A compressor safety head is a
Valve plate help down by a heavy spring
A centrifugal machine is characterized by
High volume and low pressure
If condenser pressure is high and another pump has to be
turned on you would have the
Suction valve completely opened and discharge valve open to a
throttled position
If you disconnect the external equalizer on a T E V you would
Flood the evaporator
You achieve capacity control on a reciprocating compressor
by
, Opening suction valves by using some form of control
The ratio of actual water vapor in the atmosphere to the
saturation pressure is called
Relative humidity
The most accurate statement regarding compressor motors
that run in a refrigerant atmosphere is that they use
Material tailored to the refrigerant
MUNTZ
Material should not be used with ammonia
Venting a manifold or purge line is prohibited with any
Refrigerant containing chlorine. (HCFC CFC)
You would not use a solenoid valve to
Vary the flow of refrigerant
The muffler is located between the
Compressor in the condenser
Refrigerant affect is always lower than latent heat because
Heat required to cool the refrigerant from compressor discharge
to evaporator temperature is subtracted from the latent heat
You use a T E V with an external equalizer when there is
more than
2.5 pressure drop through the evaporator coil
Direct systems
Are most likely to week refrigerant into building spaces
Gauges on the high side should be graduated to
At least 1.2 times the design pressure
When brazing in a class T machine room you must in sure
the flame is
Enclosed invented to open air
In an emergency you can dump refrigerant under
FDNY supervision
An R-22 system's head pressure with a condenser water
supply temperature of 85° is
200-215 p s I g
