Refrigerated Machine Operator Real
Engineer Review Exam Questions with
Correct Answers
What refrigeration systems are most likely to leak refrigerant in building spaces that are
being cooled? - Answer-Direct systems
An operator has been assigned to a large reciprocating machine without Unloaders of
the following safety proper procedure for starting this machine is?5 - Answer-Suction
valve and discharge bypass both open
Upon being Assigned to a facility during inspection of the facility you find there has been
failure to maintain water treatment inspecting the condenser water the 1st evidence
would most likely Be? - Answer-An increase in compressor head pressure
During A particular round and operator notices that the suction line and part of the
compressor are frosted the most likely cause of the condition is? - Answer-Not enough
refrigerant In the system
If an electric motor is rewound to cut resistance by 1/2 all of the factors being equal the
motor power would? - Answer-Increase by a factor of 2
Assume an operator is able to observe our 11 water and lubricating oil together at 70 ﾟ F
under these conditions the water moisture and fluids would settle in the container from
top to bottom in what order? - Answer-oil water refrigerant
An operator is running two centrifugul condenser water pumps in parallel one of the
pumps is at maximum pumping rate if the Operator throttles back on the discharge
valve of the other pump the most likely effect would be? - Answer-a reduction in total
flow rate to condenser
as an rmo in charge you are requested to replace the gauge on the high side of the
refrigeration system the pressure graduation rate should be? - Answer-1.2 of design
pressure (at least)
when operating a refrigeration unit operator notices that the motor compressor is short
cycling the unit is using a low side float valve the following service requirements would
indicate? - Answer-additional refrigerant be charged
of the following the most correct way to describe a brazed joint is? - Answer-Gas tight
fittings
the evaporator - Answer-absorbs heat into the refrigerant
,during a walk-through of the engine-room crmo notices excessive superheat at the
evaporator Outlet this would most likely be caused by? - Answer-any of the above
copper is used in refrigeration systems like in heat exchangers because? - Answer-High
thermal conductivity
if you were running three compressors which best describes the state of refrigerant
leaving third evaporator coil? - Answer-superheated vapor
when an evaporator is not equipped with an equalizer line you would most likely find? -
Answer-a distributor
when there is a 5 lb pressure drop across the evaporator you need an external
equalizer line what happens if it disconnects? - Answer-latent heat of evaporation
if the evaporator pressure is reduced at the expansion valve the result would be? -
Answer-a lower boiling point for the refrigerant
the purpose of the condenser is to? - Answer-remove heat from the refrigerant
what conditions of the heat in BTU per minute absorbed by the condenser water in a
refrigeration plant is the greatest? - Answer-at high evaporator temperatures and low
condenser temperatures
if the suction pressure is 60 PSIG and the discharge pressure is 180 PSIG what would
the compression ratio be? - Answer-2.6 to 1
what is the most common metering device used today in a reciprocating commercial
refrigeration system over 3 tons? - Answer-thermostatic expansion valve
and our ammo observes a gauge that reads the saturation pressure of a refrigerant if
chilled water is being circulated as the cooling medium this reading can best be used to
estimate the? - Answer-temperature of the chilled water being pumped into the building
spaces that are being cooled
machine room safety standards have been established by? - Answer-ASHRAE 15
assuming that a refrigeration plant uses a horizontal Shell & tube condenser with the
water in the tubes and refrigerant in the shell in controlling the operation of the
condenser the operator should take into account that most likely the heat transfer rate
BTU per square feet per second in the condenser will be? - Answer-increase with the
velocity of the water in the tubes
if you subcool the refrigerant it will? - Answer-enhance Refrigeration effect
, low condensing pressure is not good because? - Answer-expansion valves will not feed
properly
what is the tev diaphragm made of? - Answer-metal
what would happen if the spring into TeV were to break? - Answer-flood the evaporator
what is the purpose of The Equalizer line? - Answer-to make up for the pressure in the
evaporator
the bulb to a TXV is falling off and the room is at 85 degrees Fahrenheit evaporator
would? - Answer-flood
constant pressure expansion valve is being used instead of a thermostatic expansion
valve under various loads it will? - Answer-both A and B are correct
it will starve and flood evaporator
the automatic expansion valve is used instead of a TeV it maintains a constant pressure
on the evaporator another function is it has is? - Answer-on water type evaporators
freezing will not occur
the metering device used in a condenser is a high-side float this device will? - Answer-
control the amount of refrigerant in condenser
if a low side float is being used? - Answer-it will control refrigerant flow
while doing a routine inspection the rmo noticed the bulb of the TeV on the floor the
operator should attach the bulb at? - Answer-end of the coil
rmo would expect a relief valve to start functioning for the section of refrigerating system
being protected at a pressure closest to? - Answer-the design pressure
when installing a service valve to isolate a dual pressure device while keeping system
you would use a - Answer-stop valve
a water regulating valve is installed in a water-cooled condenser the operating force on
this valve is? - Answer-high side pressure
a reciprocating system using a evaporative condenser the muffler is installed between
the? - Answer-compressor and evaporative condenser
what refrigerant system are most likely to leak refrigerant in building space that are
being cool? - Answer-Direct system
what refrigerant systems are most likely to leak refrigerant into building spaces that are
being cooled? - Answer-Direct
Engineer Review Exam Questions with
Correct Answers
What refrigeration systems are most likely to leak refrigerant in building spaces that are
being cooled? - Answer-Direct systems
An operator has been assigned to a large reciprocating machine without Unloaders of
the following safety proper procedure for starting this machine is?5 - Answer-Suction
valve and discharge bypass both open
Upon being Assigned to a facility during inspection of the facility you find there has been
failure to maintain water treatment inspecting the condenser water the 1st evidence
would most likely Be? - Answer-An increase in compressor head pressure
During A particular round and operator notices that the suction line and part of the
compressor are frosted the most likely cause of the condition is? - Answer-Not enough
refrigerant In the system
If an electric motor is rewound to cut resistance by 1/2 all of the factors being equal the
motor power would? - Answer-Increase by a factor of 2
Assume an operator is able to observe our 11 water and lubricating oil together at 70 ﾟ F
under these conditions the water moisture and fluids would settle in the container from
top to bottom in what order? - Answer-oil water refrigerant
An operator is running two centrifugul condenser water pumps in parallel one of the
pumps is at maximum pumping rate if the Operator throttles back on the discharge
valve of the other pump the most likely effect would be? - Answer-a reduction in total
flow rate to condenser
as an rmo in charge you are requested to replace the gauge on the high side of the
refrigeration system the pressure graduation rate should be? - Answer-1.2 of design
pressure (at least)
when operating a refrigeration unit operator notices that the motor compressor is short
cycling the unit is using a low side float valve the following service requirements would
indicate? - Answer-additional refrigerant be charged
of the following the most correct way to describe a brazed joint is? - Answer-Gas tight
fittings
the evaporator - Answer-absorbs heat into the refrigerant
,during a walk-through of the engine-room crmo notices excessive superheat at the
evaporator Outlet this would most likely be caused by? - Answer-any of the above
copper is used in refrigeration systems like in heat exchangers because? - Answer-High
thermal conductivity
if you were running three compressors which best describes the state of refrigerant
leaving third evaporator coil? - Answer-superheated vapor
when an evaporator is not equipped with an equalizer line you would most likely find? -
Answer-a distributor
when there is a 5 lb pressure drop across the evaporator you need an external
equalizer line what happens if it disconnects? - Answer-latent heat of evaporation
if the evaporator pressure is reduced at the expansion valve the result would be? -
Answer-a lower boiling point for the refrigerant
the purpose of the condenser is to? - Answer-remove heat from the refrigerant
what conditions of the heat in BTU per minute absorbed by the condenser water in a
refrigeration plant is the greatest? - Answer-at high evaporator temperatures and low
condenser temperatures
if the suction pressure is 60 PSIG and the discharge pressure is 180 PSIG what would
the compression ratio be? - Answer-2.6 to 1
what is the most common metering device used today in a reciprocating commercial
refrigeration system over 3 tons? - Answer-thermostatic expansion valve
and our ammo observes a gauge that reads the saturation pressure of a refrigerant if
chilled water is being circulated as the cooling medium this reading can best be used to
estimate the? - Answer-temperature of the chilled water being pumped into the building
spaces that are being cooled
machine room safety standards have been established by? - Answer-ASHRAE 15
assuming that a refrigeration plant uses a horizontal Shell & tube condenser with the
water in the tubes and refrigerant in the shell in controlling the operation of the
condenser the operator should take into account that most likely the heat transfer rate
BTU per square feet per second in the condenser will be? - Answer-increase with the
velocity of the water in the tubes
if you subcool the refrigerant it will? - Answer-enhance Refrigeration effect
, low condensing pressure is not good because? - Answer-expansion valves will not feed
properly
what is the tev diaphragm made of? - Answer-metal
what would happen if the spring into TeV were to break? - Answer-flood the evaporator
what is the purpose of The Equalizer line? - Answer-to make up for the pressure in the
evaporator
the bulb to a TXV is falling off and the room is at 85 degrees Fahrenheit evaporator
would? - Answer-flood
constant pressure expansion valve is being used instead of a thermostatic expansion
valve under various loads it will? - Answer-both A and B are correct
it will starve and flood evaporator
the automatic expansion valve is used instead of a TeV it maintains a constant pressure
on the evaporator another function is it has is? - Answer-on water type evaporators
freezing will not occur
the metering device used in a condenser is a high-side float this device will? - Answer-
control the amount of refrigerant in condenser
if a low side float is being used? - Answer-it will control refrigerant flow
while doing a routine inspection the rmo noticed the bulb of the TeV on the floor the
operator should attach the bulb at? - Answer-end of the coil
rmo would expect a relief valve to start functioning for the section of refrigerating system
being protected at a pressure closest to? - Answer-the design pressure
when installing a service valve to isolate a dual pressure device while keeping system
you would use a - Answer-stop valve
a water regulating valve is installed in a water-cooled condenser the operating force on
this valve is? - Answer-high side pressure
a reciprocating system using a evaporative condenser the muffler is installed between
the? - Answer-compressor and evaporative condenser
what refrigerant system are most likely to leak refrigerant in building space that are
being cool? - Answer-Direct system
what refrigerant systems are most likely to leak refrigerant into building spaces that are
being cooled? - Answer-Direct
