Rmo written Exam Questions |Already
Answered | Graded A+
The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a
more efficient centrifugal compressor operation results from: - ANSWER-Lowering the condenser
pressure
The heat removed from the refrigerant in a condenser is: - ANSWER-Sensible and latent heat
The refrigerant unit that you have been assigned to is being taken out of service for a major repair.
You have been assigned to withdraw refrigerant for storage in sultable containers. According to the New
York City fire code, you must ensure that the containers: - ANSWER-approved by us department of
transportation
Which of the following best describes how the cylinder unloader work? - ANSWER-Keep in the suction
valve opened while the compressor is in return stroke.
In most semi Hermetic compressors, the suction vapor is used to: - ANSWER-Cools the motor
The amount of refrigerant that flows through the orifices of a economizer is determined by the: -
ANSWER-Difference between high and low side pressure
The Installation of an Inline refrigerant cleaning system is advisable: - ANSWER-To remove impurities
from the system
The type of refrigerant system that is least likaly to leak refrigerant into the building space that are being
cooled: - ANSWER-The Indirect system
The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this
compressor is 120 PIG. The atmospheric is 14.7 PSI. The compression ratio for the given condition is
closest to: - ANSWER-1.69
Discharge/suction
,A superheated vapor is a: - ANSWER-Dry vapor above the saturation temperature
A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following the most
likely cause for this condition is: - ANSWER-A faulty cooling tower water level controller
A centrifugal water pump is known as a lift pump when the: - ANSWER-The water supply to the pump
suction inlet is below the pump level
A TXV is used to maintain constant - ANSWER-Evaporator superheat
The chilled water supply to the bullding Is 55F. IF the chiller Is being used for human comfort, should you
be concerned about this, and why? - ANSWER-Yes, this temp is too high for human comfort
The packing gland of a centrifugal pump serves to: - ANSWER-The drip part of the packing gland gives
evidence that there is water in the pump
Capacity control of a reciprocating hermetic compressor is typically achieved through - ANSWER-
Operation of the hot gas bypass valve
The most important reason to sub-cool the refrigerant in the condenser is to ensure that: - ANSWER-A
pure liquid refrigerant will enter the metering device
A refrigeration engineer is logging reading from a reciprocating system. compressor discharge
temperature have dropped significantly and the suction line pressure is high. which of the following that
may be causing this set of condition. - ANSWER-Malfunction of unloader
A low side float valve is used to maintain: - ANSWER-The level of the refrigerant in the evaporator
Regarding fire safety, which ASHRAE refrigerant safety classification Indicates no flammability and lower
toxicity? - ANSWER-A1
, When an expansion valve is operating property, af the end of the evaporator will contain: - ANSWER-
Only superheated vapor
What Information is not contained in a Material Safety Data Sheet-MSD5? - ANSWER-Cost of material
In a steam turbing, what is the function of the Kingsbury thrust bearing - ANSWER-Maintain first stage
steam pressure
A centrifugal water pump is considered to be fully primed when - ANSWER-The pump is full of liquid
Copper tubing refrigerant lines must be installed for a new system. It is a well known service practice
that tubing collapses at bends that must be made, the refrigerant engineer should use - ANSWER-Lever
type tubing bender
A reciprocating compressor is making a knocking sound during operation. If the refrigerant worn parts
are not causing the knocking, what is probably the cause - ANSWER-The slugging of liquid refrigerant
In order for a refrigerant to become superheated it must be heated in a section of the low side
refrigerant line: - ANSWER-Where no liquid refrigerant is located
All liquid has been recovered from a system to be overhauled, the system - ANSWER-Should not be
opened untill all vapor is recovered
When a refrigerant engineer uses a portable compressor recovery unit to remove vapor
refrigerant from a refrigeration system the removal rate of the refrigerant will gradually slow down
because - ANSWER-The vapor density is decreasing
You are the engineer running a 2000-ton (steam-driven turbine) contrifugal refrigeration system, a
refrigeration system supplies chilled water to a college campus with multiple bulldings. During the
course of making your rounds, you check the 9 cell cooling tower on the roof. You note the water level
in all of the cooling tower cells is very low. Which one of the following Immediate action would take? -
ANSWER-Add additional make up water to cooling tower
Answered | Graded A+
The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a
more efficient centrifugal compressor operation results from: - ANSWER-Lowering the condenser
pressure
The heat removed from the refrigerant in a condenser is: - ANSWER-Sensible and latent heat
The refrigerant unit that you have been assigned to is being taken out of service for a major repair.
You have been assigned to withdraw refrigerant for storage in sultable containers. According to the New
York City fire code, you must ensure that the containers: - ANSWER-approved by us department of
transportation
Which of the following best describes how the cylinder unloader work? - ANSWER-Keep in the suction
valve opened while the compressor is in return stroke.
In most semi Hermetic compressors, the suction vapor is used to: - ANSWER-Cools the motor
The amount of refrigerant that flows through the orifices of a economizer is determined by the: -
ANSWER-Difference between high and low side pressure
The Installation of an Inline refrigerant cleaning system is advisable: - ANSWER-To remove impurities
from the system
The type of refrigerant system that is least likaly to leak refrigerant into the building space that are being
cooled: - ANSWER-The Indirect system
The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this
compressor is 120 PIG. The atmospheric is 14.7 PSI. The compression ratio for the given condition is
closest to: - ANSWER-1.69
Discharge/suction
,A superheated vapor is a: - ANSWER-Dry vapor above the saturation temperature
A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following the most
likely cause for this condition is: - ANSWER-A faulty cooling tower water level controller
A centrifugal water pump is known as a lift pump when the: - ANSWER-The water supply to the pump
suction inlet is below the pump level
A TXV is used to maintain constant - ANSWER-Evaporator superheat
The chilled water supply to the bullding Is 55F. IF the chiller Is being used for human comfort, should you
be concerned about this, and why? - ANSWER-Yes, this temp is too high for human comfort
The packing gland of a centrifugal pump serves to: - ANSWER-The drip part of the packing gland gives
evidence that there is water in the pump
Capacity control of a reciprocating hermetic compressor is typically achieved through - ANSWER-
Operation of the hot gas bypass valve
The most important reason to sub-cool the refrigerant in the condenser is to ensure that: - ANSWER-A
pure liquid refrigerant will enter the metering device
A refrigeration engineer is logging reading from a reciprocating system. compressor discharge
temperature have dropped significantly and the suction line pressure is high. which of the following that
may be causing this set of condition. - ANSWER-Malfunction of unloader
A low side float valve is used to maintain: - ANSWER-The level of the refrigerant in the evaporator
Regarding fire safety, which ASHRAE refrigerant safety classification Indicates no flammability and lower
toxicity? - ANSWER-A1
, When an expansion valve is operating property, af the end of the evaporator will contain: - ANSWER-
Only superheated vapor
What Information is not contained in a Material Safety Data Sheet-MSD5? - ANSWER-Cost of material
In a steam turbing, what is the function of the Kingsbury thrust bearing - ANSWER-Maintain first stage
steam pressure
A centrifugal water pump is considered to be fully primed when - ANSWER-The pump is full of liquid
Copper tubing refrigerant lines must be installed for a new system. It is a well known service practice
that tubing collapses at bends that must be made, the refrigerant engineer should use - ANSWER-Lever
type tubing bender
A reciprocating compressor is making a knocking sound during operation. If the refrigerant worn parts
are not causing the knocking, what is probably the cause - ANSWER-The slugging of liquid refrigerant
In order for a refrigerant to become superheated it must be heated in a section of the low side
refrigerant line: - ANSWER-Where no liquid refrigerant is located
All liquid has been recovered from a system to be overhauled, the system - ANSWER-Should not be
opened untill all vapor is recovered
When a refrigerant engineer uses a portable compressor recovery unit to remove vapor
refrigerant from a refrigeration system the removal rate of the refrigerant will gradually slow down
because - ANSWER-The vapor density is decreasing
You are the engineer running a 2000-ton (steam-driven turbine) contrifugal refrigeration system, a
refrigeration system supplies chilled water to a college campus with multiple bulldings. During the
course of making your rounds, you check the 9 cell cooling tower on the roof. You note the water level
in all of the cooling tower cells is very low. Which one of the following Immediate action would take? -
ANSWER-Add additional make up water to cooling tower
