2026 Provide Updated AEE CEM Dumps as Practice Test and PDF [Q15-Q32]

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2026 Provide Updated AEE CEM Dumps as Practice Test and PDF

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QUESTION 15
What is a common cause of poor power quality?

Natural gas turbine power generation by utilities

Electronic equipment, such as personal computers

Incandescent lighting

Synchronous motors

Partially loaded induction motors

QUESTION 16
Which of the following best describes a thermally-light building?

A building filled with manufacturing and process equipment

A single-story office building where the load on the heating and cooling system is proportional to the outside air (ambient) temperature

A computer data center housing multiple internet server racks

An underground storage facility

QUESTION 17
Some international electric utilities use ‘net metering” for customers with renewable energy equipment, such as photovoltaic power panels. Which of the following best describes net metering with regard to excess power generation and utility billing practices?
SELECT THE CORRECT ANSWER

Accept excess electric energy generated by a customer’s energy system, the value of which can offset the value of energy consumed by the customer over the net metering period

Accept excess electric energy generated by a customer’s energy system but with no financial compensation for the energy fed into the utility’s transmission system

Transmit electric energy generated by a customer’s energy system so that the customer may sell the excess electricity to another company on the transmission system

Net metering allows customers with renewable energy systems to receive credit for excess electricity fed back to the grid, offsetting their consumption over a billing period. This mechanism encourages renewable energy adoption by providing financial benefits to consumers.

QUESTION 18
The temperature in an unconditioned mechanical room is found to typically be around 23°C warmer than ambient air. If the air intake of an air compressor located in the mechanical room is routed through a nearby wall so that ambient air is fed directly to the air compressor’s intake, what impact can be expected on the air compressor’s energy requirement?

Increase energy use by 7.6%

Increase energy use by 3.8%

No measureable change in energy use

Decrease energy use by 3.8%

Decrease energy use by 7.6%

QUESTION 19
Calculate the monthly electric bill for a customer that used 400 kW and 75,000 kwh during one month. Use the following declining block structure for a monthly bill:

SELECT THE CORRECT ANSWER

$3,280

$4, 580

$7,850

$9,660

$12,500

We need to calculate the monthly electric bill based on the given pricing structure.
Step 1: Identify Charges from the Table
* Customer charge: $50/month
* Peak demand charge: $10/kW-month
* Electric consumption charges:
* First 25,000 kWh @ $0.06/kWh
* Excess (75,000 – 25,000) = 50,000 kWh @ $0.05/kWh
* Tax: 20% of total

QUESTION 20
Which of the following steam turbines will likely not provide steam output at a useable temperature for industrial processes?

Extraction turbine

Back-pressure turbine

Condensing turbine

Answers A and B

QUESTION 21
What is a common method to reduce the impact of voltage imbalance?

Rebalance single-phase loads

Install harmonic filters

Install capacitors to improve power factor on three-phase loads

Reverse phase connections on three-phase motors

QUESTION 22
A 75-kW induction motor operates at 80% partial load and 88% efficiency. A new high-efficiency 75-kW motor can be installed that will operate at 95% efficiency (also at 80% partial load). What is the reduction in electric power demand?

1 kW

2 kW

4 kW

5 kW

8 kW

QUESTION 23
A hot-water boiler has a cut-in set point of 65°C on the hot water supply temperature and a differential set point of 10°C. What is the hot-water supply temperature that causes the boiler to turn off?

55°C

65°C

75°C

It depends on the return water temperature

QUESTION 24
How can commissioning reduce the life-cycle cost to owners and operators?

Reduce the cost of change orders during construction

Improve the performance of energy systems

Improve the satisfaction of building occupants

Improve the effectiveness of operations and maintenance

All of the above

QUESTION 25
A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

28.4%

34.9%

42.7%

59.3%

QUESTION 26
What type of heat exchanger is commonly built into AHU’s or large RTU’s, can be used to recover heat from exhaust air, and may cause cross-contamination between heat exchange fluids?
Select the Correct Answer

Dessiccant heat wheel

Plate and frame

Heat pump

Heat pipe

Run-around coil

QUESTION 27
You can buy air compressor A for $15,000 or air compressor B for $6,000. Compressor A will cost $10,000 per year to operate. Compressor B will cost $11,500 per year to operate. If both air compressors have a 10- year life and your required return on investment is 12%, which air compressor has the lowest total life-cycle cost?

Compressor A

Compressor B

Both air compressors have the same life-cycle cost

QUESTION 28
According to ISO 50001. when performing internal audits on the energy management system in an organization the internal auditor should do which of the following?
SELECT THE CORRECT ANSWER

Focus on the areas of significant energy use

Review the written procedures related to the area under audit

Assess actual activities as practiced against what the written procedures state

Look for opportunities for energy improvement and to minimize bureaucracy inthe energy management system

All of the above

When conducting internal audits of an Energy Management System (EnMS) in accordance with ISO 50001, auditors are expected to perform several key activities to ensure the system’s effectiveness and continual improvement. These activities include:
* Focus on Areas of Significant Energy Use:Auditors should prioritize auditing areas that have substantial energy consumption, as improvements in these areas can lead to significant energy performance enhancements.
* Review Written Procedures Related to the Area Under Audit:A thorough examination of documented procedures ensures that they align with ISO 50001 requirements and organizational practices. This review helps in identifying any discrepancies between documented procedures and actual practices.
* Assess Actual Activities Against Written Procedures:Auditors compare on-ground activities with documented procedures to verify compliance and identify deviations. This assessment ensures that operations are performed as intended and in line with established protocols.
* Look for Opportunities for Energy Improvement and Minimize Bureaucracy:Identifying opportunities for enhancing energy performance is a core objective of the audit.Auditors should also aim to streamline the EnMS by reducing unnecessary complexities, thereby making it more efficient and user-friendly.
By encompassing all these activities, internal auditors ensure a comprehensive evaluation of the EnMS, leading to effective energy management and continual improvement. Therefore, the correct answer is E. All of the above.

QUESTION 29
Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

$0.25

$0.38

$0.76

$1.25

$1.44

To calculate the cost of heating water using natural gas:
Step 1: Compute Energy Required to Heat the Water
Given:
* Mass of water= 500 L = 500 kg
* Temperature rise (#T)= 50°C – 18°C = 32°C
* Specific heat of water (Cp)= 4.2 kJ/kg-°C
Energy Required (Q)=m×Cp×#T
=500×4.2×32
=67,200 kJ=67.2 MJ
A white paper with black text and numbers AI-generated content may be incorrect.

QUESTION 30
A cooling tower is delivering water to a chilled-water plant. The cooling tower outlet temperature has a 6°C approach temperature to the ambient air, wet-bulb temperature. The outside air conditions are 20°C dry bulb,
60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?

13°C

17°C

21°C

25°C

QUESTION 31
A building has a 100 m² wall with an R-value of 14.4 (m²-C/W) in a climate with 3,500 heating degree days (HDD). The building heater is 85% efficient [based on the fuel’s higher-heating value (HHV)]. The fuel cost is $5.00/GJ [based on the fuel’s higher-heating value (HHV)]. What is the annual cost of the heat loss through the wall?

$10.56/yr

$12.35/yr

$14.44/yr

$16.22/yr

$22.56/yr

QUESTION 32
A motor operates with a normal and constant load. The electric current is measured to be 25% of the motor’s nameplate rating. What does this mean?

The motor is operating at high efficiency

The motor is oversized and may be downsized to increase efficiency

The applied voltage is too low and should be increased to improve efficiency

The applied voltage is too high and should be reduced to improve efficiency

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