1. The efficiency of the refrigerant cycle is affected by Lowering the condensing
the operation of the condenser. of the following. a pressure
more efficient centrifugal compressor operation re-
sults from:
2. The heat removed from the refrigerant in a condenser Sensible and latent heat
is:
3. The refrigerant unit that you have been assigned to is Are approved by the US
being taken out of service for a major repair. you have department of transporta-
been assigned to withdraw refrigerant for storage in tion
suitable containers. according to the new York city fire
code, you must ensure that the containers:
4. Which of the following best describes how the cylinder Keep in the suction valve
unloader work? opened while the com-
pressor is in the return
stroke
5. In most semi hermetic compressors, the suction va- Cool the motor
por is used to:
6. The amount of refrigerant that flows through the ori- Ditterence between the
fices of a economizer is determined by the: high side and load side
pressure
7. The installation of an inline refrigerant cleaning sys- To remove impurities from
tem is advisable: the system
8. The type of refrigerant system that is least likely to The indirect system
leak refrigerant into the building space that are cooled
9. 1.69
, The suction pressure of a reciprocating compressor is
65PSIG. the discharge pressure of this compressor is
120PSIG. the atmospheric is 14.7 PSI. the compression
ratio for the given condition is closet to:
10. A super heated vapor is a ? Dry vapor above the satu-
ration temperature
11. A refrigerant engineer verifies that a condenser water A faulty cooling tower wa-
pump is cavitating. of the following the most likely ter level controller
cause for this condition is:
12. A centrifugal water pump is known as a lift pump The water supply to the
when the: pump suction inlet is be-
low the pump level
13. A TXV is used to maintain constant: Evaporator superheat
14. The chilled water supply to the building is 55F. if the Yes, this temperature is
chiller is being used for human comfort, should you too high for human com-
be concerned about this , and why? fort purpose
15. The packing gland of a centrifugal pump serves to: The drip part of the pack-
ing gland gives evidence
that there is water in the
pump
16. Capacity control of a reciprocating hermetic compres- Operation of the hot gas
sor is typically achieved through bypass valve
17. The most important reason to sub-cool the refrigerant A pure liquid refrigerant
in the condenser is to ensure that: will enter the metering
device
,18. A refrigeration engineer is logging reading from a An expansion valve that is
reciprocating system. compressor discharge temper- open to wide
ature have dropped significantly and the suction line
pressure is high. which of the following that may be
causing this set of condition.
19. A low side float valve is used to maintain: The level of the refrigerant
in the evaporator
20. Regarding fire safety, which ASHARE refrigerant safety A1
classification indicates no flammability and lower the
toxicity?
21. When an expansion valve is operating properly, at the Only superheated vapor
end of the evaporator will contain:
22. What information is not contained in a material safety Cost of material
data sheet-MSDS?
23. In a steam turbine, what is the function of the kings- cause
bury thrust bearing
24. A centrifugal water pump is considered to be fully
primed when
25. 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
26. A reciprocating compressor is making a knocking
sound during operation. if the refrigerant worn parts
are not causing the knocking, what is probably the
, Maintain axial positioning of the rotor shaft
The pump is full of liquid
Lever type tubing bender
The slugging of the liquid refrigerant
b b
the operation of the condenser. of the following. a pressure
more efficient centrifugal compressor operation re-
sults from:
2. The heat removed from the refrigerant in a condenser Sensible and latent heat
is:
3. The refrigerant unit that you have been assigned to is Are approved by the US
being taken out of service for a major repair. you have department of transporta-
been assigned to withdraw refrigerant for storage in tion
suitable containers. according to the new York city fire
code, you must ensure that the containers:
4. Which of the following best describes how the cylinder Keep in the suction valve
unloader work? opened while the com-
pressor is in the return
stroke
5. In most semi hermetic compressors, the suction va- Cool the motor
por is used to:
6. The amount of refrigerant that flows through the ori- Ditterence between the
fices of a economizer is determined by the: high side and load side
pressure
7. The installation of an inline refrigerant cleaning sys- To remove impurities from
tem is advisable: the system
8. The type of refrigerant system that is least likely to The indirect system
leak refrigerant into the building space that are cooled
9. 1.69
, The suction pressure of a reciprocating compressor is
65PSIG. the discharge pressure of this compressor is
120PSIG. the atmospheric is 14.7 PSI. the compression
ratio for the given condition is closet to:
10. A super heated vapor is a ? Dry vapor above the satu-
ration temperature
11. A refrigerant engineer verifies that a condenser water A faulty cooling tower wa-
pump is cavitating. of the following the most likely ter level controller
cause for this condition is:
12. A centrifugal water pump is known as a lift pump The water supply to the
when the: pump suction inlet is be-
low the pump level
13. A TXV is used to maintain constant: Evaporator superheat
14. The chilled water supply to the building is 55F. if the Yes, this temperature is
chiller is being used for human comfort, should you too high for human com-
be concerned about this , and why? fort purpose
15. The packing gland of a centrifugal pump serves to: The drip part of the pack-
ing gland gives evidence
that there is water in the
pump
16. Capacity control of a reciprocating hermetic compres- Operation of the hot gas
sor is typically achieved through bypass valve
17. The most important reason to sub-cool the refrigerant A pure liquid refrigerant
in the condenser is to ensure that: will enter the metering
device
,18. A refrigeration engineer is logging reading from a An expansion valve that is
reciprocating system. compressor discharge temper- open to wide
ature have dropped significantly and the suction line
pressure is high. which of the following that may be
causing this set of condition.
19. A low side float valve is used to maintain: The level of the refrigerant
in the evaporator
20. Regarding fire safety, which ASHARE refrigerant safety A1
classification indicates no flammability and lower the
toxicity?
21. When an expansion valve is operating properly, at the Only superheated vapor
end of the evaporator will contain:
22. What information is not contained in a material safety Cost of material
data sheet-MSDS?
23. In a steam turbine, what is the function of the kings- cause
bury thrust bearing
24. A centrifugal water pump is considered to be fully
primed when
25. 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
26. A reciprocating compressor is making a knocking
sound during operation. if the refrigerant worn parts
are not causing the knocking, what is probably the
, Maintain axial positioning of the rotor shaft
The pump is full of liquid
Lever type tubing bender
The slugging of the liquid refrigerant
b b
