CEM Body of Knowledge & Study
Guide
Page 1 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 1/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
THE CEM BODY OF KNOWLEDGE AND STUDY GUIDE
Preparation for the CEM Certification Exam
The CEM Certification Exam is a four-hour open book exam. The examination questions are based on the
Body of Knowledge listed below. Because of the diversity of background and experience of Energy
Managers, the examination has 15 different subject sections, all of which are included in the exam. You
must bring a hand calculator to the exam as the CEM exam does not allow computers, tablets, or cell
phones to be used during the test.
It is highly recommended that you review the complete Study Guide and answer the Exam Review
questions included in the Study Guide to determine your readiness for the exam.
The CEM Examination contains the following mandatory subjects:
Body of Knowledge
Percent of Exam
Codes and Standards
3%-5%
Energy Accounting and Economics
6%-10%
Energy Audits and Instrumentation
8%-12%
Electrical Power Systems and Motors
9%-13%
HVAC Systems
9%-13%
Industrial Systems
6% -8%
Building Envelope
3%-5%
CHP Systems and Renewable Energy
4%-6%
Fuel Supply and Pricing
2%-4%
Building Automation and Control Systems
7%-11%
Thermal Energy Storage Systems
2%-4%
Lighting Systems
6%-8%
Boiler and Steam Systems
3%-5%
Maintenance and Commissioning
8%-12%
Energy Savings Performance Contracting and
Measurement & Verification
3%-5%
CEM Body of Knowledge & Study
Guide
Page 2 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
STUDY GUIDE
CERTIFIED ENERGY MANAGERS (CEM
®
EXAM)
Online Self-Evaluation Exam Also Available
CEM Applicants have access to an online version self-evaluation CEM exam. The 65-question multiple
choice self-evaluation exam simulates half the certification test, contains a two hour time limit, and covers
seventeen sections. There is a $50 fee to take this online test and you may access the full details at:
Direct Link: www.aeecenter.org/cem/selfevaluation
Get a sense of how to time questions. The actual exam time allotted is 4 hours for 130 questions. You will
need to complete the 65-question self-evaluation exam in 2 hours. At the end of the exam, you will receive
a sections report that lets you know what sections you passed and failed. You will not be able to see the
specific questions that you answered wrong/right or the answers.
The following is a list of the subjects for the CEM exam. Each subject covers a number of topics. Following the list of topics are
suggested references with chapter numbers or sections. The primary references are the Handbook of Energy Engineering, 7
th
by
D. Paul Mehta and Albert Thumann, the Energy Management Handbook, 9
th
Edition by Stephen Roosa, Steve Doty and Wayne
C. Turner and Guide to Energy Management, 8
th
Edition by Barney L. Capehart, Wayne C. Turner and William J. Kennedy.
However, some other books are also referenced as appropriate.
The study guide will not lead you to answers to all of the questions, but it will certainly lead you to a very large number of correct
answers. A person with the necessary experience who reviews the study guide should not have any problem passing the exam.
The exam will: be open book, last four hours, and have 130 questions to answer. Of the 130 questions, 120 are scored and 10
randomly located questions are trial questions being prepared for possible use on future exams. The 10 trial questions do not
count toward the examinee’s score. The trial questions are randomly located and are not identified. Therefore, all 130 questions
should be answered. There are 15 sections listed below from which questions mainly are drawn.
BODY OF KNOWLEDGE: STUDY GUIDE TOPICS & REFERENCES
I.
CODES AND STANDARDS
*20XX stands for current year of standard
ASHRAE/IESNA Standard 90.1-20XX
ASHRAE Standard 90.2-20XX
ASHRAE Standard 62.1 -20XX
ASHRAE Standard 135-20XX
ASHRAE Standard 189.1- 20XX
ASHRAE Guideline 14-20XX
ASHRAE Standard 211-20XX
IEEE PQ Standard 519
International Energy Conservation Code (IECC)
ISO 50001
Green Buildings
Sustainable Design
Certified, Silver, Gold, and Platinum
Water Efficiency
Materials and Resources
ENERGY STAR Rating
Energy Star Label
LEED Certification
Energy and Atmosphere
Indoor Environmental Quality
Portfolio Manager
Green Globes
ASHRAE Green Guide
CEM Body of Knowledge & Study
Guide
Page 3 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 1.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 18 & 20.
REF: ASHRAE 62.1 2004 and 2007 Standard
REF: United States Green Building Council, website with LEED v3 and LEED Rating Systems presentations,
www.usgbc.org
REF: ENERGY STAR Building & Plants, ENERGY STAR website, www.energystar.gov
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 18
II. ENERGY ACCOUNTING AND ECONOMICS
Simple Payback Period
Time Value of Money
Present Worth
Net Present Value
Present Worth Method
After Tax Cash Flow Analysis
Internal Rate of Return
Energy Accounting
Point of Use Costs
Life Cycle Cost Method
Interest Formulas and Tables
Project Life
Annual Cost Method
Economic Performance Measures
Depreciation Methods
Impact of Fuel Escalation Rates
Energy Reporting
Efficiency Measures
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 2.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 4.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 4.
III. ENERGY AUDITS AND INSTRUMENTATION
Role of Audits
ASHRAE Level 1, 2, 3 Audit
Audit Equipment
Energy Management Measures
Combustion Analysis
Power Factor
Basic Thermodynamics
Air Velocity Measurement
Light Level Measurement
Infrared Equipment
Fuel Choices
Energy Use Index
Load Factors
Combustion Analyzers
Electric Metering
Temperature Measurement
Pressure Measurement
Humidity Measurement
Energy and Power Measurement
HHV and LHV
Energy Cost Index
Rate Structure & Analysis
ASHRAE Standard 211-20XX
Flow Measurement
Heat Measuremet
Behavioral Modification
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 3.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 3.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 2.
CEM Body of Knowledge & Study
Guide
Page 4 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
IV. ELECTRICAL POWER SYSTEMS AND MOTORS
Demand and Energy
Real Power
Power Factor
Rate Structure and Analysis
Variable Speed Drives
Power Quality
Grounding
Load Factors
Reactive Power
Three Phase Systems
Peak Demand Reduction
Motors and Motor Drives
Affinity Laws (Pump and Fan Laws)
Harmonics
AC Induction Motors
DC Motors
Load Factor and Slip
Motor Speed Control
Fan and Pump Laws
Motor Selection Criteria
Motor Management Software
AC Synchronous Motors
High Efficiency Motors
Variable Frequency Drives
Variable Flow Systems
New vs. Rewound Motors
Electronically Commutated Motors
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 4.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 11.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 5 & 7.
V. HVAC SYSTEMS
Heating, Ventilating, and Air Conditioning (HVAC)
Affinity Laws
Psychrometric Chart
HVAC Equipment Types
Degree Days
Heat Transfer
Vapor Compression Cycle
Cooling Towers
Variable Refrigerant Flow
Performance Rating (COP, EER, kW/ton)
HVAC Economizers
Air Distribution Systems (Reheat, Multizone, VAV)
Chillers
Energy Consumption Estimates
Absorption Cycle
Air and Water Based Heat Flow
Demand Control Ventilation
Smart Pumps
Chilled Beam Systems
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 7 & 8.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 10.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 8.
VI. INDUSTRIAL SYSTEMS
Waste Heat Recovery
Industrial Energy Management
Steam Systems
Heat Exchangers
Turbines
Compressed Air Systems
Air Compressor Controls
Boilers and Thermal Systems
Fuel Choices
Steam Tables
Compressors
Pumps and Pumping Systems
CEM Body of Knowledge & Study
Guide
Page 5 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
Air Compressors
Air Leaks
Prime Power options
Peaking Power options
District Heating Systems
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 5, 6 & 12.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 5, 6 & 8.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 14.
VII.
BUILDING ENVELOPE
Thermal Resistance
Insulation
Solar Heat Gain
Thermally Light Facilities
Conduction Heat Loads
Heat Transfer
Heat Transfer Coefficients
Vapor Barriers
Solar Shading
Thermally Heavy Facilities
Psychrometric Chart
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 7.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 9 & 15.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 13.
VIII. CHP SYSTEMS and RENEWABLE ENERGY
Topping Cycles
Combined Cycles
Prime Movers
Regulations
Combined Heat and Power
HHV and LHV
Solar, Wind, Biomass, and Hydropower
Solar Thermal and Solar Photovoltaic Systems
Bottoming Cycles
Fuel Selection
Operating Strategies
Codes and Standards
Distributed Generation
Thermal Efficiencies
Wind Energy Systems
Heat Recovery Steam Generators
Micro-Grids
Battery Storage
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 9.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 7.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 15 & 16
IX. FUEL SUPPLY AND PRICING
Procurement of Natural Gas
Electricity as a Commodity
Procurement of Oil
Supply and Demand Impact on Pricing
Evaluating Supply Options
Selection of Energy Supplier in a Deregulated Market
Fuel Price Risks
Trends in Deregulation
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 1.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 23 & 24.
CEM Body of Knowledge & Study
Guide
Page 6 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
X. BUILDING AUTOMATION AND CONTROL SYSTEMS
Energy Management Strategies
Basic Controls
Open Protocol Systems
Power Line Carriers
Distributed Control
Optimization Controls
Building Control Strategies
Expert Systems
Self-Tuning Control Loops
TCP/IP
BAS Energy Management Systems
Terminology
PID Controls
Signal Carriers
Direct Digital Control
Central Control
Reset Controls
Communication Protocols
Artificial Intelligence
Energy Information Systems
Web Based Systems
Impact of proprietary controls on integration
Internet Of Things (IOT)
Cloud based Systems
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 4 & 10.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 12.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 11 & 17.
XI. THERMAL ENERGY STORAGE SYSTEMS
Design Strategies
Storage Media
Chilled Water Storage
Sizing
Full Storage Systems
Operating Strategies
Advantages and Limitations
Ice Storage
Volume Requirements
Partial Storage Systems
Phase Change Materials (PCM)
Thermal Storage for Heating
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 19.
XII. LIGHTING SYSTEMS
Light Sources
Lamp Life
Lumens
Zonal Cavity Design Method
Coefficient of Utilization
Lamp Lumen Depreciation
Dimming
Color Temperature
Visual Comfort Factor
Ballasts
Lighting Retrofits
Efficiency and Efficacy
Strike and Restrike
Footcandles
Inverse Square Law
Room Cavity Ratios
Light Loss Factors
Lighting Controls
Color Rendering Index
Reflectors
Ballast Factor
IES Lighting Standard
Luminaire Specific Lighting Controls
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 4.
CEM Body of Knowledge & Study
Guide
Page 7 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 13.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 6.
XIII. BOILER AND STEAM SYSTEMS
Combustion Efficiency
Excess Air
Steam Traps
Condensate Return
Waste Heat Recovery
Scaling and Fouling
HHV and LHV
Air to Fuel Ratio
Boiler Economizers
Steam Leaks
Boiler Blowdown
Flash Steam
Turbulators
Condensing Boilers
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 6.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 5 & 6.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 9 and 10.
XIV. MAINTENANCE AND COMMISSIONING
MAINTENANCE
Combustion Control
Steam Leaks
Insulation
Group Relamping
Preventive Maintenance
Boiler Scale
Compressed Air Leaks
Steam Traps
Outside Air Ventilation
Scheduled Maintenance
Proactive Maintenance
Water Treatment
Behavioral Modification
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 11.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 14.
REF: Capehart, Turner and Kennedy, Guide to Energy Management, Chapter 12 & 20.
COMMISSIONING
Purpose of Commissioning
Need for Commissioning
Retro-Commissioning
Phases of Commissioning
Commissioning Documentation
Measurement in Support of Commissioning
Benefits of Commissioning
Commissioning New Buildings
Real Time and Continuous Commissioning
Commissioning Agent
Facility Design Intent
Re-commissioning
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 26
XV. ENERGY SAVINGS PERFORMANCE CONTRACTING and MEASUREMENT AND
VERIFICATION
Measurement and Verification Protocols
Energy Service Companies
Utility Financing
Demand Side Management
CEM Body of Knowledge & Study
Guide
Page 8 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
Savings Determination
Risk Assessment
Loans, Stocks and Bonds
Energy Savings Performance Contracting (ESPC)
Shared Savings Contracts
Contracting and Leasing
Utility Energy Services Contract (UESC)
REF: Mehta and Thumann, Handbook of Energy Engineering, Chapter 13.
REF: Roosa, Doty and Turner, Energy Management Handbook, Chapter 25 & 27.
CEM Body of Knowledge & Study
Guide
Page 9 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
EXAM REVIEW QUESTIONS (Sample Only)
Some of these review questions may be more complex or difficult than the exam but will be good practice
problems.
1. What is the basis for Commercial Building Codes by most states?
A. ASHRAE 90.2
B. ASHRAE 90.1
C. ASHRAE 62.2
D. ASHRAE 60.1
2. ASHRAE Standard 55 has rules for:
A. Ventilation for acceptable indoor air quality
B. Energy standard for buildings except low rise residential buildings
C. Thermal environmental conditions for human occupancy
D. All the above
3. If electricity is selling for $0.06 per kilowatt-hour and is used for electric heating with an efficiency of
90%, what is the equivalent price of natural gas per therm if it can be burned with an efficiency of 80%?
A. $1.33/therm
B. $1.47/therm
C. $1.56/therm
D. $1.65/therm
E. $1.780/therm
4. An energy saving device will save $25,000 per year for 8 years. How much can a company pay for this
device if the interest rate (discount rate) is 15%?
A. $10,000
B. $77,000
C. $112,000
D. $173,000
5. What would be used to find hot spots or phase imbalances in an AC circuit?
A. Ohmmeter
B. Infrared Camera
C. Wattmeter
D. All of the above
6. An audit for one firm showed that the power factor is almost always 70% and that the demand is
1000kW. What capacitor size is needed to correct power factor to 90%?
A. 266 kVAR
B. 536 kVAR
C. 618 kVAR
D. 1000 kVAR
CEM Body of Knowledge & Study
Guide
Page 10 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
7. The amount of reactive power that must be supplied by capacitors to correct a power factor of 84% to
95% in a 400 HP motor at 75% load and 98% efficiency is
A. 72.4 kVAR
B. 82.5 kVAR
C. 90.04 kVAR
D. 92.4 kVAR
E. 123.5 kVAR
8. Power factor correcting capacitors may be located
A. At the inductive load
B. At load control centers
C. At the customer side of the service transformer
D. All of the above
9. You find that you can replace a 50 HP motor with a 5 HP motor by cutting the total air flow
requirements. Both motors operate at full load. Calculate the total dollar savings, given the information
below: {Hint: savings of 45 HP}
Runtime: 8,760 hours/year
Motor Efficiency: 90% (both motors)
Electrical Rate: $9.00/kW/mo
$0.05/kWh
Fuel Cost Adjustment: $0.005/kWh
A. $22,000
B. $18,798
C. $15,650
D. $12,710
E. $9,874
10. An absorption system with a COP of 0.8 is powered by hot water that enters at 200 F and exits at 180 F
at a rate of 25 gpm. The chilled water operates on a 10 F temperature difference. Calculate the Chilled
water flow. You do not need to know how an absorption chiller works to solve this problem.
Use COP = qout/qin.
A. 10 gpm
B. 20 gpm
C. 40 gpm
D. 45 gpm
E. 50 gpm
11. 10,000 cfm of air leaves an air handler at 50 F; it is delivered to a room at 65 F. No air was lost in the
duct. No water was added or taken away from the air in the duct. How many BTU/hr was lost in the
ductwork due to conduction?
A. 162,000 BTU/hr
B. 126,550 BTU/hr
C. 75,000 BTU/hr
D. 42,550 BTU/hr
E. 10,000 BTU/hr
CEM Body of Knowledge & Study
Guide
Page 11 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
12. An investment tax credit of 10% for a single project (Not the company) at a large company:
A. Reduces the company’s overall taxes by 10%
B. Increases depreciation rate by 10%
C. Effectively reduces first cost of the project by 10%
D. A and C
13. Air at 69 F dry bulb and 50% relative humidity flows at 6750 cubic feet per minute and is heated to 90 F
dry bulb. How many BTU/hr is required in this process?
A. 50,000 BTU/hr
B. 75,000 BTU/hr
C. 152,000 BTU/hr
D. 310,000 BTU/hr
14. Estimate the seasonal energy consumption for a building if its design-heating load has been determined
to be 350,000 BTU/hr for a design temperature difference of 70 F. This means that the Building Load
Coefficient, U x A, equals 5000. The heating season has 3,500-degree days. The heating unit efficiency
is 80%. Assume 1 MCF = 10
6
BTU.
A. 625 MCF/year
B. 525 MCF/year
C. 420 MCF/year
D. 356 MCF/year
E. 225 MCF/year
15. A wall has a total R-value of 15. Determine the annual cost of the heat loss per square foot in a climate
having 5,000 heating degree-days. The heating unit efficiency is 70% and the fuel cost is $5.00/million
BTUs.
A. $0.057/yr/ft
2
B. $0.040/yr/ft
2
C. $0.0312/yr/ft
2
D. $0.0201/yr/ft
2
16. A 10,000 square foot building consumed the following amounts of energy last year. What is the Energy
Use Index of the building in BTU per square foot per year?
• Natural Gas 5,000 therms/year
• Electricity 60,000 kWh/year
A. 7,500 BTU/square foot/yr
B. 18,000 BTU/square foot/yr
C. 31,500 BTU/square foot/yr
D. 70,500 BTU/square foot/yr
E. 700,000 BTU/square foot/yr
CEM Body of Knowledge & Study
Guide
Page 12 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
17. Assuming that adding 2 inches of fiberglass insulation drops the U-value of a building from 0.24 to
0.098, calculate the annual cooling savings per square foot from the data given below:
• 2,000 cooling degree days; Cooling COP = 2.5; Electrical cost $0.05/kWh
A. $0.010/ft
2
-yr
B. $0.025/ft
2
-yr
C. $0.040/ft
2
-yr
D. $0.195/ft
2
-yr
E. $0.202/ft
2
-yr
18. How much fuel is wasted if 100 pounds per hour of condensate at 30 psia saturated liquid is drained to
the sewer and is made up with water at 60 F. Assume the boiler is 80% efficient and ignore blowdown
effects.
A. 12,090 BTU/hr
B. 15,200 BTU/hr
C. 18,000 BTU/hr
D. 23,850 BTU/hr
E. 29,800 BTU/hr
19. Select the equipment best suited to efficient air-to-air heat exchange and humidity control in the
HVAC system of a large office building:
A. Heat pipe
B. Radiation recuperator
C. Rotary sensible heat wheel
D. Shell and tube heat exchanger
E. Run around heat exchanger loop
20. Chilled water reset increases chiller efficiency and succeeds because it ________ .
A. Restarts the system.
B. Raises the water temperature leaving the chiller.
C. Lowers the water flowrate through the chiller.
D. Stops water flow to zones with no occupancy.
21. The difference between the setting at which the controller operates to one position and the setting at
which it changes to the other is known as the:
A. Throttling range
B. Offset
C. Differential
D. Control Point
22. An all-electric facility pays $100,000 annually for energy. The compressed air system has energy costs
of $20,000 per year. The system air pressure can be lowered by 10 psi. Approximately how much will
be saved annually?
A. $20,000
B. $10,000
C. $5,000
D. $2,000
E. $1,000
CEM Body of Knowledge & Study
Guide
Page 13 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
23. With a load leveling TES strategy, a building manager will
A. Not operate the chiller during peak hours
B. Essentially base load the chiller (i.e., operate at high load most of the time)
C. Operate only during the peaking times
D. Operate in the “off” season
24. In retrofitting a large commercial building with a TES, which of these considerations would be least
important?
A. System efficiency
B. Space issues
C. Demand cost
D. Equipment cost
25. A building presently has the following lighting system:
Present System
Type: 196 mercury vapor light fixtures
Size: 250 watt/lamp (285 watt/fixture, including ballast)
You have chosen to replace the existing system with the following:
Proposed System
Type: 140 high pressure sodium fixtures
Size: 150 watt/lamp (185 watt/fixture)
The facility operates 24 hours/day. Approximate the heating effect if the heating system efficiency is
80%, fuel costs $5.00 per million BTUs and there are 200 heating days (not heating degree days) per
year. That is, find the increased heating cost for the heating system when the lights are more efficient,
and produce less heat.
A. $6,986/year
B. $5,289/year
C. $4,485/year
D. $3,070/year
E. $2,548/year
26. A program available at no-cost from a US Department of Energy website that displays cost and
efficiency data on electric motors is:
A. Freeware
B. Building Life Cycle Cost
C. MotorMaster
D. 3EPlus
E. QuickPEP
27. Given the same amount of excess air and the same flue gas stack temperature rise (look at 50% excess
air and 500 degrees F stack temperature rise, for example), which fuel provides the highest boiler
combustion efficiency?
A. Natural Gas
B. No. 2 Fuel Oil
C. No. 6 Fuel Oil
CEM Body of Knowledge & Study
Guide
Page 14 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
28. A boiler is rated at 30 boiler horsepower and 80% efficient. What is the input rating?
A. 1,255,000 BTU/hr
B. 1,005,000 BTU/hr
C. 2,502, 500 BTU/hr
D. 3,628,750 BTU/hr
E. 13,400,000 BTU/hr
29. In a steam system, several things can happen to the condensate. Which of these is the best from the
standpoint of energy expense?
A. Drain condensate to sewer
B. Recover condensate in an insulated system at atmospheric pressure
C. Recover condensate in an un-insulated system at boiler pressure
D. Recover condensate in an insulated system at or near boiler pressure
30. Which of the following projects, or ECOs, would likely reduce boiler and steam system costs?
A. Adding boiler endplate insulation
B. Installing condensate return system
C. Repairing steam leaks
D. Installing combustion air preheater
E. All the above
31. Estimate the waste heat available in Btu/minute from a refinery flare gas leaving a process unit at 800
deg F if it is flowing at 1,000 cfm and weighs 0.08 lb/cubic foot. Its specific heat or heat content over
the temperature range is 0.3 Btu/lb·°F and you should assume the waste gas could be reduced in
temperature to 250 deg F.
A. 178,000 Btu/min
B. 165,000 Btu/min
C. 44,000 Btu/min
D. 19,200 Btu/min
E. 13,200 Btu/min
32. Water at 70 deg F is supplied to a 100 psia boiler. 1000 lb/hr of steam from the boiler is supplied to a
process. How much heat was required to be added in the boiler to create the 1000 lb/hr of steam?
A. 1000 Btu/hr
B. 234,500 Btu/hr
C. 729,250 Btu/hr
D. 1,150,000 Btu/hr
E. 3,759,000 Btu/hr
33. A 100 HP rotary screw air-compressor generates heat equivalent to about:
A. 1000 Btu/hr
B. 12,000 Btu/hr
C. 100,000 Btu/hr
D. 250,000 Btu/hr
CEM Body of Knowledge & Study
Guide
Page 15 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
34. An optimum start is a control function that:
A. shuts off the outside ventilation air during start up of the building
B. shuts off equipment for duty cycling purpose
C. senses outdoor and indoor temperatures to determine the start time needed
to heat or cool down a building to desired temperatures
D. starts randomly
35. Which of the following could be used to detect failed steam traps?
A. Ultrasonic equipment to listen to the steam trap operation
B. Infrared camera to detect the change in temperature
C. Real time MMS using conductance probes
D. All of the above
36. Calculate the group re-lamping interval for T8 lamp fixtures with instant start ballasts that annually
operate for 4,160 hrs with rated life of 15,000 hrs (assuming replacements at 70% of rated life)
A. 1.0 year
B. 2.5 years
C. 3.5 years
D. 4.5 years
CEM Body of Knowledge & Study
Guide
Page 16 of 16
Version No: 1.5
Approved by: Helen Johnson
Approved on: 1/10/2019
Effective Date: 11/10/2019
Supersedes: Version 1.4
Copyright
©
2019 Association of Energy Engineers. All rights reserved.
CEM Exam questions Key
Questions
Answers
1
(B)
2
(C)
3
(C)
4
(C)
5
(B)
6
(B)
7
(A)
8
(D)
9
(A)
10
(C)
11
(A)
12
(C)
13
(C)
14
(B)
15
(A)
16
(D)
17
(C)
18
(D)
Questions
Answers
19
(A)
20
(B)
21
(C)
22
(E)
23
(B)
24
(A)
25
(D)
26
(C)
27
(C)
28
(A)
29
(D)
30
(E)
31
(E)
32
(D)
33
(D)
34
(C)
35
(D)
36
(B)
For a listing of AEE Certification Programs: Visit www.aeecenter.org/certification
For a listing of Training Providers: Visit https://www.aeecenter.org/trainingproviders
For a listing of Remote Testing Centers: Visit www.aeecenter.org/cem
For AEE Membership Info: Visit www.aeecenter.org/membership
CEM
®
Certified Energy Manager is a registered trade mark of the Association of Energy Engineers. The information contained herewith is for
informational purposes only and does not imply endorsement from AEE in any kind.
CEM application, procedures, requirements, and eligibility are subject to change.
