Refrigeration Excellence
1. In a dry type (direct enlargement) evaporator, liquid refrigerant ought to boil away as near the
stop of the coil as viable so one can:
A. Operate at excessive-efficiency
B. Ensure that Frost isn't always gather
C. Subcool the compressor
D. Ensure proper oil go back - ANS-A. Operate at excessive-performance
2. The difference between the temperature of the refrigerant boiling in the evaporator and the
temperature at the evaporator outlet is known as
A. Evaporator superheat
B. Latent warmness
C. Evaporator sub-cooling
D. Sublimation - ANS-A. Evaporator superheat
three. An enlargement tool this is caught open will cause
A. Low suction stress
B. A starved evaporator
C. Excessive superheat
D. A flooded evaporator - ANS-D. A flooded evaporator
4. When measuring evaporator superheat on a industrial device that has a protracted suction
line, the strain studying need to be taken on the
A. Compressor inlet
B. Evaporator outlet
C. Condenser outlet
D. Receiver Inlet - ANS-A. Compressor inlet
5. Superheat measurements are first-rate taken
A. During a hot pulldown
B. At eight°F two 12°F
C. During defrost
D. With the system running at design conditions - ANS-D. With the device operating at layout
conditions
6. A technician is checking the superheat on a multi circuit evaporator and unearths one of the
circuits has a superheat that is better than the others. This may be resulting from
A. A grimy coil
B. A refrigerant overcharge
C. Uneven air distribution
,D. A blocked distributor - ANS-D. A blocked distributor
7. A TXV with an external equalizer is used on
A. Evaporators with a excessive strain drop
B. Evaporators with a low strain drop
C. High temperature software is simplest
D. All evaporators - ANS-A. Evaporators with a high stress drop
8. Dry type evaporators function maximum efficiently with the superheat setting of about
A. 8°F to twelve°F
B. Thirteen°F to 19°F
C. 20°F to 30°F
D. 31°F to 40°F - ANS-A. 8°F to twelve°F
nine. An evaporator used to relax drinks is working within regular superheat placing. But the
machine isn't always cooling the product well. Which of the subsequent is maximum probably
the reason?
A. Overcharge of refrigerant
B. Undercharge of refrigerant
C. The circulator
D. The TXV - ANS-A. Overcharge of refrigerant
10. What time c language is required between every superheat adjustment?
A. Not less than one hour
B. About 10 to fifteen mins
C. At least a half hour
D. No time put off - ANS-B. About 10 to 15 mins
11. A low temperature evaporator used for cooling space or product refrigeration
A. Is the same as one used for medium or excessive temperatures
B. Must have fins space nearer collectively
C. Must be frosted periodically
D. Must be defrosted periodically - ANS-D. Must be defrosted periodically
12. Some special applications use a flooded evaporator (operated full of refrigerant) if you want
to keep the right level of liquid refrigerant, a ______ kind gadgets used.
A. High aspect float
B. Capillary tube
C. AEV
D. Low aspect go with the flow - ANS-D. Low aspect float
13. A properly functioning condenser will first
A. Condense, then de-superheat
B. Sub-cool, then de-superheat
, C. Sub-cool, then superheat
D. De-superheat, then sub-cool - ANS-D. De-superheat, then sub-cool
14. The impact of an inefficient water cooled condenser will
A. Act similar to an air cooled condenser
B. Act specific than an air cooled condenser
C. Always be mixed with incoming medium without being reheated
D. Seldom be inefficient on industrial system - ANS-A. Act the same as an air cooled condenser
15. The refrigerant condensing temperature in a water cooled condenser is typically about
_____ higher than the leaving water.
A. Five°F
B. 10°F
C. 15°F
D. 20°F - ANS-B. 10°F
16. The refrigerant and an air cooled condenser will commonly contends at approximately
_____ better temperature than the air passing over it.
A. 10°F
B. 30°F
C. Seventy five°F
D. A hundred°F - ANS-B. 30°F
17. Workable head stress for the duration of intervals of low ambient temperature can be
finished via the usage of
A. An economizer
B. Evaporator dampers
C. Evaporator flooding
D. Fan cycle manipulate - ANS-D. Fan cycle manage
18. Cooling towers that pass air over water to do away with device heat are constrained in
capability by way of
A. Outside air wetbulb temperature
B. Outside air dry bulb temperature
C. Inside air wetbulb temperature
D. Inside air dry bulb temperature - ANS-A. Outside air wetbulb temperature
19. Parallel compressors frequently referred to as a rack gadget may additionally use
A. A commonplace suction, however no longer a not unusual discharge header
B. A common discharge header, however not a remark segment header
C. Both remark segment header and common discharge header
D. A commonplace accumulator, but never a common receiver - ANS-A. A common suction, but
no longer a common discharge header
1. In a dry type (direct enlargement) evaporator, liquid refrigerant ought to boil away as near the
stop of the coil as viable so one can:
A. Operate at excessive-efficiency
B. Ensure that Frost isn't always gather
C. Subcool the compressor
D. Ensure proper oil go back - ANS-A. Operate at excessive-performance
2. The difference between the temperature of the refrigerant boiling in the evaporator and the
temperature at the evaporator outlet is known as
A. Evaporator superheat
B. Latent warmness
C. Evaporator sub-cooling
D. Sublimation - ANS-A. Evaporator superheat
three. An enlargement tool this is caught open will cause
A. Low suction stress
B. A starved evaporator
C. Excessive superheat
D. A flooded evaporator - ANS-D. A flooded evaporator
4. When measuring evaporator superheat on a industrial device that has a protracted suction
line, the strain studying need to be taken on the
A. Compressor inlet
B. Evaporator outlet
C. Condenser outlet
D. Receiver Inlet - ANS-A. Compressor inlet
5. Superheat measurements are first-rate taken
A. During a hot pulldown
B. At eight°F two 12°F
C. During defrost
D. With the system running at design conditions - ANS-D. With the device operating at layout
conditions
6. A technician is checking the superheat on a multi circuit evaporator and unearths one of the
circuits has a superheat that is better than the others. This may be resulting from
A. A grimy coil
B. A refrigerant overcharge
C. Uneven air distribution
,D. A blocked distributor - ANS-D. A blocked distributor
7. A TXV with an external equalizer is used on
A. Evaporators with a excessive strain drop
B. Evaporators with a low strain drop
C. High temperature software is simplest
D. All evaporators - ANS-A. Evaporators with a high stress drop
8. Dry type evaporators function maximum efficiently with the superheat setting of about
A. 8°F to twelve°F
B. Thirteen°F to 19°F
C. 20°F to 30°F
D. 31°F to 40°F - ANS-A. 8°F to twelve°F
nine. An evaporator used to relax drinks is working within regular superheat placing. But the
machine isn't always cooling the product well. Which of the subsequent is maximum probably
the reason?
A. Overcharge of refrigerant
B. Undercharge of refrigerant
C. The circulator
D. The TXV - ANS-A. Overcharge of refrigerant
10. What time c language is required between every superheat adjustment?
A. Not less than one hour
B. About 10 to fifteen mins
C. At least a half hour
D. No time put off - ANS-B. About 10 to 15 mins
11. A low temperature evaporator used for cooling space or product refrigeration
A. Is the same as one used for medium or excessive temperatures
B. Must have fins space nearer collectively
C. Must be frosted periodically
D. Must be defrosted periodically - ANS-D. Must be defrosted periodically
12. Some special applications use a flooded evaporator (operated full of refrigerant) if you want
to keep the right level of liquid refrigerant, a ______ kind gadgets used.
A. High aspect float
B. Capillary tube
C. AEV
D. Low aspect go with the flow - ANS-D. Low aspect float
13. A properly functioning condenser will first
A. Condense, then de-superheat
B. Sub-cool, then de-superheat
, C. Sub-cool, then superheat
D. De-superheat, then sub-cool - ANS-D. De-superheat, then sub-cool
14. The impact of an inefficient water cooled condenser will
A. Act similar to an air cooled condenser
B. Act specific than an air cooled condenser
C. Always be mixed with incoming medium without being reheated
D. Seldom be inefficient on industrial system - ANS-A. Act the same as an air cooled condenser
15. The refrigerant condensing temperature in a water cooled condenser is typically about
_____ higher than the leaving water.
A. Five°F
B. 10°F
C. 15°F
D. 20°F - ANS-B. 10°F
16. The refrigerant and an air cooled condenser will commonly contends at approximately
_____ better temperature than the air passing over it.
A. 10°F
B. 30°F
C. Seventy five°F
D. A hundred°F - ANS-B. 30°F
17. Workable head stress for the duration of intervals of low ambient temperature can be
finished via the usage of
A. An economizer
B. Evaporator dampers
C. Evaporator flooding
D. Fan cycle manipulate - ANS-D. Fan cycle manage
18. Cooling towers that pass air over water to do away with device heat are constrained in
capability by way of
A. Outside air wetbulb temperature
B. Outside air dry bulb temperature
C. Inside air wetbulb temperature
D. Inside air dry bulb temperature - ANS-A. Outside air wetbulb temperature
19. Parallel compressors frequently referred to as a rack gadget may additionally use
A. A commonplace suction, however no longer a not unusual discharge header
B. A common discharge header, however not a remark segment header
C. Both remark segment header and common discharge header
D. A commonplace accumulator, but never a common receiver - ANS-A. A common suction, but
no longer a common discharge header
