CERTIFIED ENERGY MANAGER (CEM) PRACTICE
EXAMINATION PRACTICE 100+ QUESTIONS 2026 –
VERIFIED Q&A WITH RATIONALES FROM CERTIFIED
EXAMINER ACTUAL EXAM PREP 100% FAST REVISION
Board of Certified Energy Managers Examination Content Outline
1. Energy Accounting and Economics
2. Electrical Systems
3. HVAC Systems
4. Motors and Drives
5. Lighting Systems
6. Building Envelope
7. Industrial Systems
8. Renewable Energy and Sustainability
9. Energy Auditing
10.Codes, Standards, and Safety
11. Which metric is most commonly used to evaluate energy efficiency in buildings
A. Load factor
B. Power factor
C. Energy Use Intensity
D. Demand factor
Answer: C. Energy Use Intensity
Energy Use Intensity (EUI) measures energy consumption per unit area and is widely
used to benchmark building efficiency.
12. What does a power factor of 1.0 indicate
A. Maximum losses
B. No reactive power
C. High harmonic distortion
D. Low efficiency
Answer: B. No reactive power
A power factor of 1 means all supplied power is used effectively with no reactive
component.
13. Which device is used to improve power factor
A. Transformer
B. Capacitor bank
C. Rectifier
D. Inverter
Answer: B. Capacitor bank
Capacitor banks supply reactive power locally, reducing the demand from the utility.
14. What is the primary purpose of an energy audit
A. Increase production
, B. Identify energy savings opportunities
C. Reduce labor costs
D. Improve aesthetics
Answer: B. Identify energy savings opportunities
Energy audits evaluate systems to find inefficiencies and recommend improvements.
15. Which lighting technology is most energy efficient
A. Incandescent
B. Fluorescent
C. LED
D. Halogen
Answer: C. LED
LEDs provide the highest lumens per watt and longest lifespan.
16. What is the unit of electrical power
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: C. Watt
Power is measured in watts, representing energy per unit time.
17. Which motor type is most efficient for variable load applications
A. Induction motor without control
B. DC motor
C. Motor with Variable Frequency Drive
D. Synchronous motor
Answer: C. Motor with Variable Frequency Drive
VFDs adjust motor speed to match load, reducing energy use.
18. What is demand charge based on
A. Total energy use
B. Peak power usage
C. Average consumption
D. Voltage level
Answer: B. Peak power usage
Utilities charge based on the highest demand during a billing period.
19. Which HVAC system is most efficient for large commercial buildings
A. Window units
B. Split systems
C. Chilled water systems
D. Portable AC units
Answer: C. Chilled water systems
Central chilled water systems offer high efficiency for large loads.
20. What is COP in refrigeration
A. Cost of performance
B. Coefficient of performance
C. Capacity of plant
D. Cooling output parameter
, Answer: B. Coefficient of performance
COP measures efficiency as cooling output divided by input energy.
21. Which fuel has the highest energy content per unit mass
A. Coal
B. Natural gas
C. Diesel
D. Hydrogen
Answer: D. Hydrogen
Hydrogen has the highest energy per mass, though storage challenges exist.
22. What is the purpose of insulation
A. Increase heat transfer
B. Reduce heat transfer
C. Increase airflow
D. Improve lighting
Answer: B. Reduce heat transfer
Insulation minimizes unwanted heat loss or gain.
23. Which instrument measures electrical current
A. Voltmeter
B. Ammeter
C. Wattmeter
D. Ohmmeter
Answer: B. Ammeter
An ammeter measures current flow in amperes.
24. What does kWh measure
A. Power
B. Energy
C. Voltage
D. Resistance
Answer: B. Energy
kWh represents energy consumption over time.
25. Which process improves boiler efficiency
A. Increasing excess air
B. Reducing excess air
C. Increasing stack temperature
D. Reducing insulation
Answer: B. Reducing excess air
Too much excess air wastes heat and reduces efficiency.
26. What is a common renewable energy source
A. Coal
B. Solar
C. Diesel
D. LPG
Answer: B. Solar
Solar energy is clean and renewable.
27. Which factor affects heat transfer rate
A. Color
EXAMINATION PRACTICE 100+ QUESTIONS 2026 –
VERIFIED Q&A WITH RATIONALES FROM CERTIFIED
EXAMINER ACTUAL EXAM PREP 100% FAST REVISION
Board of Certified Energy Managers Examination Content Outline
1. Energy Accounting and Economics
2. Electrical Systems
3. HVAC Systems
4. Motors and Drives
5. Lighting Systems
6. Building Envelope
7. Industrial Systems
8. Renewable Energy and Sustainability
9. Energy Auditing
10.Codes, Standards, and Safety
11. Which metric is most commonly used to evaluate energy efficiency in buildings
A. Load factor
B. Power factor
C. Energy Use Intensity
D. Demand factor
Answer: C. Energy Use Intensity
Energy Use Intensity (EUI) measures energy consumption per unit area and is widely
used to benchmark building efficiency.
12. What does a power factor of 1.0 indicate
A. Maximum losses
B. No reactive power
C. High harmonic distortion
D. Low efficiency
Answer: B. No reactive power
A power factor of 1 means all supplied power is used effectively with no reactive
component.
13. Which device is used to improve power factor
A. Transformer
B. Capacitor bank
C. Rectifier
D. Inverter
Answer: B. Capacitor bank
Capacitor banks supply reactive power locally, reducing the demand from the utility.
14. What is the primary purpose of an energy audit
A. Increase production
, B. Identify energy savings opportunities
C. Reduce labor costs
D. Improve aesthetics
Answer: B. Identify energy savings opportunities
Energy audits evaluate systems to find inefficiencies and recommend improvements.
15. Which lighting technology is most energy efficient
A. Incandescent
B. Fluorescent
C. LED
D. Halogen
Answer: C. LED
LEDs provide the highest lumens per watt and longest lifespan.
16. What is the unit of electrical power
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: C. Watt
Power is measured in watts, representing energy per unit time.
17. Which motor type is most efficient for variable load applications
A. Induction motor without control
B. DC motor
C. Motor with Variable Frequency Drive
D. Synchronous motor
Answer: C. Motor with Variable Frequency Drive
VFDs adjust motor speed to match load, reducing energy use.
18. What is demand charge based on
A. Total energy use
B. Peak power usage
C. Average consumption
D. Voltage level
Answer: B. Peak power usage
Utilities charge based on the highest demand during a billing period.
19. Which HVAC system is most efficient for large commercial buildings
A. Window units
B. Split systems
C. Chilled water systems
D. Portable AC units
Answer: C. Chilled water systems
Central chilled water systems offer high efficiency for large loads.
20. What is COP in refrigeration
A. Cost of performance
B. Coefficient of performance
C. Capacity of plant
D. Cooling output parameter
, Answer: B. Coefficient of performance
COP measures efficiency as cooling output divided by input energy.
21. Which fuel has the highest energy content per unit mass
A. Coal
B. Natural gas
C. Diesel
D. Hydrogen
Answer: D. Hydrogen
Hydrogen has the highest energy per mass, though storage challenges exist.
22. What is the purpose of insulation
A. Increase heat transfer
B. Reduce heat transfer
C. Increase airflow
D. Improve lighting
Answer: B. Reduce heat transfer
Insulation minimizes unwanted heat loss or gain.
23. Which instrument measures electrical current
A. Voltmeter
B. Ammeter
C. Wattmeter
D. Ohmmeter
Answer: B. Ammeter
An ammeter measures current flow in amperes.
24. What does kWh measure
A. Power
B. Energy
C. Voltage
D. Resistance
Answer: B. Energy
kWh represents energy consumption over time.
25. Which process improves boiler efficiency
A. Increasing excess air
B. Reducing excess air
C. Increasing stack temperature
D. Reducing insulation
Answer: B. Reducing excess air
Too much excess air wastes heat and reduces efficiency.
26. What is a common renewable energy source
A. Coal
B. Solar
C. Diesel
D. LPG
Answer: B. Solar
Solar energy is clean and renewable.
27. Which factor affects heat transfer rate
A. Color
