Children's Health | Plant Troubleshooting 301

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Question 1 of 8

1. Question
Which of the following terms best describes a measure of energy efficiency for refrigeration systems?
- Coefficient of performance
- Coefficient of friction
- kW/foot
- BTUH
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Question 2 of 8

2. Question
Refer to the following scenario:

A chilled water control valve at an AHU is having problems opening and closing properly against the system pressure. Which of the following values best describes the valve authority range that would be most appropriate for replacing the valve?
- 0.2 – 0.5
- 2 – 5
- 4 – 20
- 10 – 100
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Question 3 of 8

3. Question
Which of the following factors affects vent system design and operation?
- Flue-gas temperature, vent heat loss, vent height, venting system capacity, venting system restrictions, and ambient temperature
- Flue-gas temperature, vent heat loss, vent height, venting system capacity, venting system restrictions, and ambient barometric pressure
- Heating water supply temperature, vent heat loss, vent height, venting system capacity, venting system restrictions, and ambient barometric pressure
- Heating water supply temperature, vent heat loss, venting system capacity, venting system restrictions, and ambient temperature
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Question 4 of 8

4. Question
Which of the following terms is best defined as the mathematical relationship between variables involved in pump performance?
- Affinity Law
- Bernoulli’s Law
- Law of Thermodynamics
- Reynolds Law
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Question 5 of 8

5. Question
Which of the following phrases describes the point when a vacuum breaker is required on a shell and tube heat exchanger?
- When the condensate is backing up and the shell is below atmospheric pressure
- When the condensate is draining and the shell is above atmospheric pressure
- When the tubes are below atmospheric pressure
- A vacuum breaker is never required.
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Question 6 of 8

6. Question
Where should an isolation valve be installed in relation to the dialectic union, when connecting two different piping materials?
- Immediately upstream of the union on the supply line
- Anywhere between the union and downstream of the equipment
- Immediately downstream of the union on the supply line
- Immediately upstream of the union on the return line
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Question 7 of 8

7. Question
Where should the secondary pump control differential pressure sensor be located to properly control a variable secondary chilled water system?
- The pressure required to supply an adequate flow of chilled water to the most hydraulically remote point in the piping system
- The pressure required to supply an adequate flow of chilled water to all the buildings’ critical loads during occupied operation
- The pressure required to keep all of the buildings’ air handler Delta-Ts as high as possible for the location’s American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) design conditions
- The pressure required to keep the flat plate heat exchangers flooded, when all of them are being used to provide cooling
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Question 8 of 8

8. Question
Which of the following phrases best defines pump efficiency?
- Ratio of the hydraulic pumping power (kW) compared to the pump’s shaft power (kW)
- Ratio of the pump’s flow (GPM) to the impeller speed (FPM)
- Ratio of the pump’s flow (GPM) compared to the pump dynamic head (FT)
- Ratio of the pump’s impeller speed (FPM) compare to the pump’s output pressure (PSI)
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Children’s Health | Plant Troubleshooting 301

Children’s Health | Plant Troubleshooting 301

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