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9 Cards in this Set
- Front
- Back
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Which of the following is not a step in the seasonal pre-start service? 1) Check the magnetic strainers 2) Clean all cooling and chilled water strainers 3) Turn on energy sources 4) Check the purge pump 5) Add water treatment chemicals |
Turn on energy sources |
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Which of the following are elements of a mechanical purging system? 1. Purge pickup tube 2. Purge chamber 3. Manual shutoff valve 4. Safety solenoid valve 5. Oil trap 6. Vacuum pump 1) 1, 2 2) 1, 2, 3, 4, 5, 6 3) 1, 2, 5 4) 4, 6 5) 1, 3, 5 |
2) 1, 2, 3, 4, 5, 6 |
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If there is crystallization upon shutdown a possible corrective action? 1) Check pump operation 2) Adjust cooling tower control 3) Add octyl alcohol charge 4) Purge the system 5) Reduce steam pressure |
Check pump operation |
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Octyl alcohol is added to the lithium bromide solution to: 1) Help the lithium bromide solution absorb ammonia 2) Act as a wetting agent 3) Help the lithium bromide solution absorb non-condensables 4) Act as a dispersing agent 5) Act as a drying agent |
Act as a wetting agent |
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During seasonal start-up, when should the purge pump be started? 1) At least 24 hours after the compressor is started 2) Simultaneously with the absorption unit 3) About one half hour after the absorption unit is started 4) One half hour before the absorption unit is started 5) Only when non-condensable gases are detected in the system |
About one half hour after the absorption unit is started |
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Which of the following is not a result of having non-condensable gases in the absorption systems? 1) Corrosion 2) Crystallization in the heat exchanger 3) Lower than normal temperatures of the chilled water leaving the evaporator 4) Reduction in capacity of the system 5) Oxidation of lithium bromide |
Lower than normal temperatures of the chilled water leaving the evaporator |
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When shutting down the lithium bromide refrigeration system for a weekend or less, which of the following is a correct shutdown procedure? 1) Service the purge pump 2) Close the manual steam or hot water supply valve 3) Drain the cooling water circuit 4) Turn off the air supply to the pneumatic control system 5) Open all disconnect switches |
Close the manual steam or hot water supply valve |
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The concentration of the lithium bromide solution can be most easily controlled by controlling the: 1) Amount of weak lithium bromide pumped into the generator 2) Volume of water sprayed into the absorber 3) Pressure in the vacuum between the evaporator and the absorber 4) Temperature in the cooling tower 5) Temperature in the generator |
Temperature in the generator |
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When the temperature of a solution increases, which of the following statements is true? 1) Less water molecules leave the solution 2) The equilibrium constant decreases 3) The concentration decreases 4) The solubility of the salt decreases 5) The vapour pressure increases |
The vapour pressure increases |
