Certified Energy Manager (CEM) Newest
Updated 150 Questions And Correct
Answers From Actual Past Papers Exams
(Graded A+) Plus Rationales 2025|2026
Q&A | Instant Download Pdf
1. The primary objective of energy management is to:
A. Increase energy consumption to improve productivity
B. Eliminate all energy use in a facility
C. Optimize energy use while maintaining required performance
D. Replace all existing equipment immediately
Answer: C. Optimize energy use while maintaining required performance
Energy management focuses on reducing unnecessary energy consumption while
maintaining or improving operational performance, comfort, reliability, and
productivity.
2. The first step in developing an effective energy management program is
usually:
A. Purchasing new equipment
B. Conducting an energy audit or energy assessment
C. Replacing all lighting systems
D. Installing renewable energy systems
Answer: B. Conducting an energy audit or energy assessment
An energy assessment identifies current energy use, losses, and improvement
opportunities before investments are made.
, 3. Energy intensity is commonly expressed as:
A. Energy cost divided by equipment age
B. Energy consumption per unit of output or area
C. Total energy consumption only
D. Energy savings divided by investment cost
Answer: B. Energy consumption per unit of output or area
Energy intensity measures how efficiently energy is used, such as kWh per square
meter or energy per unit of production.
4. Which instrument is commonly used to measure electrical power quality?
A. Thermometer
B. Flow meter
C. Power analyzer
D. Pressure gauge
Answer: C. Power analyzer
Power analyzers measure electrical parameters such as voltage, current, power
factor, harmonics, and demand.
5. The main purpose of benchmarking energy performance is to:
A. Compare performance against similar facilities
B. Increase equipment size
C. Eliminate maintenance programs
D. Reduce production levels
Answer: A. Compare performance against similar facilities
Benchmarking helps identify whether a facility is performing efficiently compared
with similar operations.
6. The energy balance of a facility compares:
A. Energy purchased with energy used and lost
B. Employee numbers with energy bills
,C. Equipment size with building age
D. Maintenance cost with production cost
Answer: A. Energy purchased with energy used and lost
An energy balance accounts for where energy enters, where it is used, and where
losses occur.
7. Demand charges on an electricity bill are based mainly on:
A. Total annual energy consumption only
B. Peak power demand during a billing period
C. Number of employees
D. Equipment operating temperature
Answer: B. Peak power demand during a billing period
Demand charges are associated with the highest rate of electricity use during a
specific interval.
8. Power factor is the ratio of:
A. Real power to apparent power
B. Voltage to resistance
C. Current to frequency
D. Energy to time
Answer: A. Real power to apparent power
Power factor indicates how effectively electrical power is converted into useful
work.
9. A low power factor generally causes:
A. Lower electrical losses
B. Increased system efficiency
C. Higher current requirements
D. Reduced electricity demand
Answer: C. Higher current requirements
, Low power factor increases current flow, which can increase losses and
equipment loading.
10.The unit of electrical energy consumption is:
A. kW
B. kWh
C. kVA
D. Hz
Answer: B. kWh
kWh measures the amount of electrical energy consumed over time.
11.A variable frequency drive (VFD) is mainly used to:
A. Increase motor voltage permanently
B. Control motor speed and improve efficiency
C. Replace all electrical wiring
D. Eliminate maintenance requirements
Answer: B. Control motor speed and improve efficiency
VFDs adjust motor speed according to load requirements, reducing unnecessary
energy use.
12.The largest energy-saving opportunity in many industrial motor systems is:
A. Painting motors
B. Improving motor system efficiency and control
C. Increasing motor operating hours
D. Removing lubrication systems
Answer: B. Improving motor system efficiency and control
Motor systems often consume significant energy, making efficiency improvements
highly valuable.
13.The coefficient of performance (COP) of a refrigeration system is:
Updated 150 Questions And Correct
Answers From Actual Past Papers Exams
(Graded A+) Plus Rationales 2025|2026
Q&A | Instant Download Pdf
1. The primary objective of energy management is to:
A. Increase energy consumption to improve productivity
B. Eliminate all energy use in a facility
C. Optimize energy use while maintaining required performance
D. Replace all existing equipment immediately
Answer: C. Optimize energy use while maintaining required performance
Energy management focuses on reducing unnecessary energy consumption while
maintaining or improving operational performance, comfort, reliability, and
productivity.
2. The first step in developing an effective energy management program is
usually:
A. Purchasing new equipment
B. Conducting an energy audit or energy assessment
C. Replacing all lighting systems
D. Installing renewable energy systems
Answer: B. Conducting an energy audit or energy assessment
An energy assessment identifies current energy use, losses, and improvement
opportunities before investments are made.
, 3. Energy intensity is commonly expressed as:
A. Energy cost divided by equipment age
B. Energy consumption per unit of output or area
C. Total energy consumption only
D. Energy savings divided by investment cost
Answer: B. Energy consumption per unit of output or area
Energy intensity measures how efficiently energy is used, such as kWh per square
meter or energy per unit of production.
4. Which instrument is commonly used to measure electrical power quality?
A. Thermometer
B. Flow meter
C. Power analyzer
D. Pressure gauge
Answer: C. Power analyzer
Power analyzers measure electrical parameters such as voltage, current, power
factor, harmonics, and demand.
5. The main purpose of benchmarking energy performance is to:
A. Compare performance against similar facilities
B. Increase equipment size
C. Eliminate maintenance programs
D. Reduce production levels
Answer: A. Compare performance against similar facilities
Benchmarking helps identify whether a facility is performing efficiently compared
with similar operations.
6. The energy balance of a facility compares:
A. Energy purchased with energy used and lost
B. Employee numbers with energy bills
,C. Equipment size with building age
D. Maintenance cost with production cost
Answer: A. Energy purchased with energy used and lost
An energy balance accounts for where energy enters, where it is used, and where
losses occur.
7. Demand charges on an electricity bill are based mainly on:
A. Total annual energy consumption only
B. Peak power demand during a billing period
C. Number of employees
D. Equipment operating temperature
Answer: B. Peak power demand during a billing period
Demand charges are associated with the highest rate of electricity use during a
specific interval.
8. Power factor is the ratio of:
A. Real power to apparent power
B. Voltage to resistance
C. Current to frequency
D. Energy to time
Answer: A. Real power to apparent power
Power factor indicates how effectively electrical power is converted into useful
work.
9. A low power factor generally causes:
A. Lower electrical losses
B. Increased system efficiency
C. Higher current requirements
D. Reduced electricity demand
Answer: C. Higher current requirements
, Low power factor increases current flow, which can increase losses and
equipment loading.
10.The unit of electrical energy consumption is:
A. kW
B. kWh
C. kVA
D. Hz
Answer: B. kWh
kWh measures the amount of electrical energy consumed over time.
11.A variable frequency drive (VFD) is mainly used to:
A. Increase motor voltage permanently
B. Control motor speed and improve efficiency
C. Replace all electrical wiring
D. Eliminate maintenance requirements
Answer: B. Control motor speed and improve efficiency
VFDs adjust motor speed according to load requirements, reducing unnecessary
energy use.
12.The largest energy-saving opportunity in many industrial motor systems is:
A. Painting motors
B. Improving motor system efficiency and control
C. Increasing motor operating hours
D. Removing lubrication systems
Answer: B. Improving motor system efficiency and control
Motor systems often consume significant energy, making efficiency improvements
highly valuable.
13.The coefficient of performance (COP) of a refrigeration system is:
