BOC Water Systems Efficiency Module
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. A facility manager is evaluating water efficiency in a chilled water
system. Which strategy most directly reduces condenser water
consumption in a cooling tower system?
A Increasing pump head pressure
B Increasing cycles of concentration in the cooling tower
C Increasing blowdown rate
D Increasing makeup water flow
Increasing cycles of concentration reduces the frequency of
blowdown and therefore decreases overall water consumption while
maintaining acceptable water quality control.
2. What is the primary purpose of cooling tower blowdown control?
A Increase evaporation rate
, B Improve airflow through tower
C Remove concentrated dissolved solids from circulating water
D Increase condenser temperature
Blowdown control prevents excessive mineral buildup by discharging
a portion of concentrated water, maintaining system efficiency and
preventing scaling.
3. Which parameter is most commonly used to determine cycles of
concentration in a cooling tower?
A Air velocity
B Pump efficiency
C Conductivity of circulating and makeup water
D Water temperature differential
Conductivity is directly proportional to dissolved solids and is used to
calculate how concentrated the cooling water has become.
4. A sudden increase in water usage in a building cooling system is most
likely caused by:
A Reduced heat load
B Excessive cooling tower blowdown or leakage
C Increased insulation efficiency
D Reduced pump speed
Unexpected water consumption increases often indicate uncontrolled
blowdown or system leaks within the cooling loop.
,5. What is the main function of a water softener in boiler systems?
A Increase water pressure
B Remove oxygen from water
C Remove calcium and magnesium ions to prevent scale formation
D Increase conductivity
Water softeners replace hardness ions with sodium ions, preventing
scale buildup in boilers and improving efficiency.
6. Which condition most directly indicates potential Legionella growth
risk in water systems?
A High water pressure
B Water temperature between 20°C and 45°C
C High flow velocity
D Low dissolved solids
Legionella bacteria thrive in warm stagnant water conditions
typically between 20°C and 45°C.
7. Which is the most effective method to reduce potable water use in
HVAC systems?
A Increase flushing frequency
B Use condensate recovery systems
C Increase blowdown rate
D Increase system pressure
Condensate recovery reuses clean water formed during cooling
processes, significantly reducing potable water demand.
, 8. The most energy-efficient pump control strategy for variable water
demand is:
A Constant speed pumping
B Manual throttling
C Variable frequency drive (VFD) control
D Oversized pump operation
VFDs adjust pump speed to match demand, reducing both water
waste and energy consumption.
9. What is the primary purpose of submetering water systems in large
buildings?
A Increase water pressure
B Reduce installation cost
C Identify and isolate water consumption by system or zone
D Improve water temperature control
Submetering allows detailed tracking of water use, enabling
targeted efficiency improvements.
10. Which factor most significantly impacts cooling tower water
efficiency?
A Pipe color
B Building orientation
C Ambient wet bulb temperature
D Electrical frequency
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A facility manager is evaluating water efficiency in a chilled water
system. Which strategy most directly reduces condenser water
consumption in a cooling tower system?
A Increasing pump head pressure
B Increasing cycles of concentration in the cooling tower
C Increasing blowdown rate
D Increasing makeup water flow
Increasing cycles of concentration reduces the frequency of
blowdown and therefore decreases overall water consumption while
maintaining acceptable water quality control.
2. What is the primary purpose of cooling tower blowdown control?
A Increase evaporation rate
, B Improve airflow through tower
C Remove concentrated dissolved solids from circulating water
D Increase condenser temperature
Blowdown control prevents excessive mineral buildup by discharging
a portion of concentrated water, maintaining system efficiency and
preventing scaling.
3. Which parameter is most commonly used to determine cycles of
concentration in a cooling tower?
A Air velocity
B Pump efficiency
C Conductivity of circulating and makeup water
D Water temperature differential
Conductivity is directly proportional to dissolved solids and is used to
calculate how concentrated the cooling water has become.
4. A sudden increase in water usage in a building cooling system is most
likely caused by:
A Reduced heat load
B Excessive cooling tower blowdown or leakage
C Increased insulation efficiency
D Reduced pump speed
Unexpected water consumption increases often indicate uncontrolled
blowdown or system leaks within the cooling loop.
,5. What is the main function of a water softener in boiler systems?
A Increase water pressure
B Remove oxygen from water
C Remove calcium and magnesium ions to prevent scale formation
D Increase conductivity
Water softeners replace hardness ions with sodium ions, preventing
scale buildup in boilers and improving efficiency.
6. Which condition most directly indicates potential Legionella growth
risk in water systems?
A High water pressure
B Water temperature between 20°C and 45°C
C High flow velocity
D Low dissolved solids
Legionella bacteria thrive in warm stagnant water conditions
typically between 20°C and 45°C.
7. Which is the most effective method to reduce potable water use in
HVAC systems?
A Increase flushing frequency
B Use condensate recovery systems
C Increase blowdown rate
D Increase system pressure
Condensate recovery reuses clean water formed during cooling
processes, significantly reducing potable water demand.
, 8. The most energy-efficient pump control strategy for variable water
demand is:
A Constant speed pumping
B Manual throttling
C Variable frequency drive (VFD) control
D Oversized pump operation
VFDs adjust pump speed to match demand, reducing both water
waste and energy consumption.
9. What is the primary purpose of submetering water systems in large
buildings?
A Increase water pressure
B Reduce installation cost
C Identify and isolate water consumption by system or zone
D Improve water temperature control
Submetering allows detailed tracking of water use, enabling
targeted efficiency improvements.
10. Which factor most significantly impacts cooling tower water
efficiency?
A Pipe color
B Building orientation
C Ambient wet bulb temperature
D Electrical frequency
