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Exam Code: CEM
Exam Name: Certified Energy Manager (CEM)
Updated: Aug 16, 2026
Q & A: 146 Questions and Answers
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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Operations, Maintenance and Commissioning | 5% | - Maintenance best practices - Commissioning and retro-commissioning |
| Topic 2: Lighting Systems | 10% | - Daylighting integration - Design and control strategies - Lighting technologies and efficiency |
| Topic 3: Energy Accounting and Economics | 15% | - Time value of money, NPV, IRR, payback analysis - Energy units and conversions - Utility rate structures and tariffs - Life cycle costing and economic analysis |
| Topic 4: Electrical Power Systems and Motors | 15% | - Motor systems, efficiency and controls - Power distribution and quality - Power factor correction and load management |
| Topic 5: Energy Storage Systems | 3–5 | - Integration and benefits - Storage technologies and applications |
| Topic 6: Building Automation and Controls | 5% | - Automation and optimization - Control systems and strategies - Building management systems |
| Topic 7: Boiler and Steam Systems | 4–6 | - Operation and efficiency - Maintenance and optimization |
| Topic 8: Energy Savings Performance Contracting | 5% | - Guaranteed savings and risk allocation - Contract structures and financing |
| Topic 9: Industrial Systems | 6–8 | - Process energy efficiency - Compressed air, pumping, and drying systems |
| Topic 10: Codes, Standards and Regulations | 5% | - Sustainability policies and frameworks - Energy efficiency codes and standards - Compliance and reporting requirements |
| Topic 11: Distributed Generation and Renewable Energy | 4–6 | - Grid integration and economics - Combined heat and power (CHP) - Solar, wind, biomass, geothermal |
| Topic 12: HVAC Systems and Building Envelope | 15% | - Thermal envelope performance - Load calculation and system selection - Heating, ventilation and air conditioning |
| Topic 13: Measurement and Verification | 5% | - Baseline development and savings calculation - M&V protocols and standards |
| Topic 14: Energy Audits and Instrumentation | 10% | - Audit levels and methodologies - Measurement tools and instrumentation - Energy performance indicators - Data collection and analysis |
1. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)
A) 1,191 m³
B) 1,356 m³
C) 766 m³
D) 2,618 m³
E) 4,180 m³
2. A facility has a monthly peak power demand of 1,000 kW and an average power factor of 80%. The facility pays a demand charge of $7.50/kVA-month. What is the additional cost per month because the power factor is less than 100%?
A) $187/month
B) $1,875/month
C) $0/month
D) $2,244/month
E) $3,370/month
3. A facility has the thermal cooling load profile shown in the table below. The utility rate traffic has an no-peak time-of-use period that begins at 10:00 a.m ends at 7:00 p.m. What chiller capacity (output) is required for a load-leveling operating strategy?
[Question from the previous image, which was about chiller capacity for load leveling, but the table was missing]
A) 8.0 GJ/h
B) 5.0 GJ/h
C) 4.0 GJ/h
D) 7.0 GJ/h
4. What type of heat transfer is reduced by adding insulation to the inside surface of a wall?
A) Convection
B) Radiation
C) Conduction
5. What is a common cause of poor power quality?
A) Natural gas turbine power generation by utilities
B) Partially loaded induction motors
C) Synchronous motors
D) Electronic equipment, such as personal computers
E) Incandescent lighting
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: D |
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