California Energy Management Systems
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. A large California commercial office complex installs an advanced
Energy Management System (EMS) integrating HVAC, lighting, demand
response, occupancy sensors, and real-time utility pricing signals.
During commissioning, the facility manager notices that peak demand
charges remain unusually high despite occupancy schedules being
programmed correctly. Which of the following EMS operational
deficiencies would MOST likely contribute to excessive peak demand
charges during occupied morning startup periods?
A. Excessive use of economizer mode during low outdoor humidity
conditions
,B. Simultaneous startup of major HVAC equipment without load staggering
algorithms
C. Reduced lighting levels through daylight harvesting controls
D. Increased chilled water reset temperatures during partial occupancy
periods
B. Simultaneous startup of major HVAC equipment without load staggering
algorithms
Simultaneous startup of large HVAC loads creates significant electrical
demand spikes during morning warm-up periods. Effective EMS
programming should stagger equipment startup to reduce peak demand
charges and improve load management performance.
2. A certified EMS technician is reviewing trend logs from a hospital
central plant and identifies repeated short cycling of chilled water
pumps controlled by variable frequency drives (VFDs). Which of the
following conditions is MOST likely causing this operational instability?
A. Excessively wide proportional-integral-derivative (PID) control deadband
settings
B. Improperly calibrated differential pressure sensors causing unstable
feedback signals
C. Increased chilled water return temperatures from occupied patient wings
D. Proper operation of pump lead-lag sequencing algorithms
,B. Improperly calibrated differential pressure sensors causing unstable
feedback signals
Faulty or improperly calibrated pressure sensors provide inaccurate control
feedback, causing VFD-controlled pumps to cycle erratically as the EMS
attempts to maintain unstable system pressure conditions.
3. An EMS operator receives an alarm indicating that a building
automation controller has lost communication with multiple rooftop
units over a BACnet MS/TP network. Which troubleshooting step
should be performed FIRST?
A. Replace all rooftop unit control boards immediately
B. Verify network wiring polarity, termination, and communication voltage
levels
C. Reprogram all occupancy schedules for the affected devices
D. Increase chilled water flow to compensate for communication failure
B. Verify network wiring polarity, termination, and communication voltage
levels
Communication failures on BACnet MS/TP networks are commonly caused
by wiring issues, incorrect termination, or electrical signal problems.
Verifying physical network integrity is the appropriate initial
troubleshooting step.
, 4. During a California summer demand response event, an EMS
automatically reduces nonessential electrical loads in a university
campus building. Which strategy would MOST effectively reduce
electrical demand while maintaining occupant comfort?
A. Completely shutting down all air handling units during occupied hours
B. Raising cooling setpoints slightly while reducing lighting intensity in low-
priority areas
C. Disabling all building exhaust systems regardless of occupancy
requirements
D. Turning off all server room cooling systems temporarily
B. Raising cooling setpoints slightly while reducing lighting intensity in low-
priority areas
Moderate cooling setpoint adjustments combined with targeted lighting
reductions provide meaningful demand reduction while minimizing
occupant discomfort and preserving critical building operations.
5. A facility engineer notices that an EMS-controlled economizer is
introducing excessive outside air during periods of high outdoor
humidity, increasing indoor moisture levels. Which sensor failure is
MOST likely responsible?
A. Return air humidity sensor reading inaccurately low values
B. Supply fan current sensor reading excessively high values
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. A large California commercial office complex installs an advanced
Energy Management System (EMS) integrating HVAC, lighting, demand
response, occupancy sensors, and real-time utility pricing signals.
During commissioning, the facility manager notices that peak demand
charges remain unusually high despite occupancy schedules being
programmed correctly. Which of the following EMS operational
deficiencies would MOST likely contribute to excessive peak demand
charges during occupied morning startup periods?
A. Excessive use of economizer mode during low outdoor humidity
conditions
,B. Simultaneous startup of major HVAC equipment without load staggering
algorithms
C. Reduced lighting levels through daylight harvesting controls
D. Increased chilled water reset temperatures during partial occupancy
periods
B. Simultaneous startup of major HVAC equipment without load staggering
algorithms
Simultaneous startup of large HVAC loads creates significant electrical
demand spikes during morning warm-up periods. Effective EMS
programming should stagger equipment startup to reduce peak demand
charges and improve load management performance.
2. A certified EMS technician is reviewing trend logs from a hospital
central plant and identifies repeated short cycling of chilled water
pumps controlled by variable frequency drives (VFDs). Which of the
following conditions is MOST likely causing this operational instability?
A. Excessively wide proportional-integral-derivative (PID) control deadband
settings
B. Improperly calibrated differential pressure sensors causing unstable
feedback signals
C. Increased chilled water return temperatures from occupied patient wings
D. Proper operation of pump lead-lag sequencing algorithms
,B. Improperly calibrated differential pressure sensors causing unstable
feedback signals
Faulty or improperly calibrated pressure sensors provide inaccurate control
feedback, causing VFD-controlled pumps to cycle erratically as the EMS
attempts to maintain unstable system pressure conditions.
3. An EMS operator receives an alarm indicating that a building
automation controller has lost communication with multiple rooftop
units over a BACnet MS/TP network. Which troubleshooting step
should be performed FIRST?
A. Replace all rooftop unit control boards immediately
B. Verify network wiring polarity, termination, and communication voltage
levels
C. Reprogram all occupancy schedules for the affected devices
D. Increase chilled water flow to compensate for communication failure
B. Verify network wiring polarity, termination, and communication voltage
levels
Communication failures on BACnet MS/TP networks are commonly caused
by wiring issues, incorrect termination, or electrical signal problems.
Verifying physical network integrity is the appropriate initial
troubleshooting step.
, 4. During a California summer demand response event, an EMS
automatically reduces nonessential electrical loads in a university
campus building. Which strategy would MOST effectively reduce
electrical demand while maintaining occupant comfort?
A. Completely shutting down all air handling units during occupied hours
B. Raising cooling setpoints slightly while reducing lighting intensity in low-
priority areas
C. Disabling all building exhaust systems regardless of occupancy
requirements
D. Turning off all server room cooling systems temporarily
B. Raising cooling setpoints slightly while reducing lighting intensity in low-
priority areas
Moderate cooling setpoint adjustments combined with targeted lighting
reductions provide meaningful demand reduction while minimizing
occupant discomfort and preserving critical building operations.
5. A facility engineer notices that an EMS-controlled economizer is
introducing excessive outside air during periods of high outdoor
humidity, increasing indoor moisture levels. Which sensor failure is
MOST likely responsible?
A. Return air humidity sensor reading inaccurately low values
B. Supply fan current sensor reading excessively high values
