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9 Cards in this Set
- Front
- Back
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Higher than normal head pressure is undesirable for all of the following reasons except: 1) It decreases condenser capacity 2) It is detrimental to compressor lubrication 3) It reduces compressor capacity 4) It increases power consumption 5) It over stresses compressor parts |
It decreases condenser capacity |
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The chilling coil in an automatic purger has a primary function to: 1) Keep the system cooling while being purged 2) Keep discharge through the coil at the lowest available suction pressure 3) Increase the efficiency of the system 4) Lower the operating temperature of the purger 5) Separate refrigerant vapour from the non-condensable gases to be purged |
Separate refrigerant vapour from the non-condensable gases to be purged |
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When using lighted sulphur candles to test for ammonia leaks in a refrigeration system the presence of ammonia will be indicated by: 1) Light brown smoke 2) Light red smoke 3) A cloud of yellow smoke 4) Heavy black smoke 5) Heavy white smoke
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Heavy white smoke |
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When charging a refrigeration system it should be done: 1) To the receiver 2) To the condenser 3) With the compressor off 4) With the liquid line shutoff valve closed 5) With the cooling water shut off |
With the liquid line shutoff valve closed |
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Which of the following is not a recommended step for the procedure in which dry nitrogen is used for a system leak test? 1) Connect the nitrogen cylinder to the system charging valve 2) Close the liquid line shut-off valve 3) Set the pressure, reducing valve for the minimum design pressure of the high side 4) Remove controls and relief valves that may be damaged by the test pressure 5) Open the cylinder shut-off valve and disconnect the nitrogen cylinder |
Open the cylinder shut-off valve and disconnect the nitrogen cylinder |
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The initial refrigerant charge is given where on the system? 1) The evaporator 2) The high side of the system 3) The heat exchanger 4) The low side of the system 5) The expansion valve |
The high side of the system |
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Charging a refrigeration system is done: 1) Between the condenser and the receiver 2) With the expansion valve closed 3) With the compressor shut down 4) By adding refrigerant between the liquid shutoff valve and the expansion valve 5) Between the suction valve and the compressor |
By adding refrigerant between the liquid shutoff valve and the expansion valve |
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The refrigerant liquid charging valve connection is: 1) On the compressor suction crossover valve 2) Between the evaporator and the compressor inlet 3) On the storage receiver 4) On the liquid line after the liquid shutoff valve 5) On the condenser |
On the liquid line after the liquid shutoff valve |
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Frost formation on the suction line indicates what? 1) Thermostat controlled solenoid deterioration 2) Inadequate levels of refrigerant in the system 3) Moisture in the system 4) "Copper-Plating" on the bearings and compressor exhaust valve 5) Overcharging the system |
Overcharging the system |
