[Jun 24, 2026] Prepare For The CEM Question Papers In Advance
CEM PDF Dumps Real 2026 Recently Updated Questions
NEW QUESTION # 49
If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?
- A. Increase the controller differential
- B. Reduce the controller differential
- C. Increase the controller set point
Answer: B
NEW QUESTION # 50
Which pump system listed below is most likely the best application for converting to variable-speed drive for energy savings?
SELECT THE CORRECT ANSWER
- A. Centrifugal pump varying its flowrate with bypass control, circulating liquid in a closed loop cooling system
- B. Piston pump operating at full capacity with throttle valve fully open, transferring liquid from an underground dam to the roof of a building
- C. Reciprocating pump with on-off control, transferring liquid vertically for one hour per day
- D. Positive displacement rotary lobe pumps in parallel, in a constant flow rebar quenching application with a static head of 80 m and negligible friction head
Answer: A
NEW QUESTION # 51
For general indoor residential lighting applications, which lamp would you recommend to replace an 11 watt CFL with in order to provide the most appropriate illumination with the highest efficacy?
SELECT THE CORRECT ANSWER
- A. 4 watt incandescent
- B. 5 watt low-pressure sodium
- C. 36 watt fluorescent tube with electronic ballast
- D. 7 watt light-emitting diode
- E. 10 watt light-emitting diode
Answer: D
NEW QUESTION # 52
What will commonly be the most appropriate expected lamp life for a fluorescent lamp fitted with an occupancy sensor, that is operational in a school?
SELECT THE CORRECT ANSWER
- A. 20,000 calendar hours
- B. 1,000 operational hours
- C. 50,000 calendar hours
- D. 50,000 operational hours
- E. 18,000 operational hours
Answer: E
NEW QUESTION # 53
Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings in a project that upgraded lighting in a large manufacturing plant?
- A. Option C - Whole facility measurement
- B. Option A - Retrofit isolation: key parameter measurement
- C. Option D - Calibrated simulation
- D. Option E - Stipulated savings
- E. Option B - Retrofit isolation: all parameter measurement
Answer: E
NEW QUESTION # 54
What is the purpose of top (or skimming) blowdown in a steam boiler?
- A. To flush out the boiler room drain system
- B. To dilute the level of impurities in the boiler water thus allowing the addition of cleaner make up water
- C. To reduce the buildup of sediment in the boiler
- D. To reduce the buildup of feedwater chemicals in the boiler
Answer: D
NEW QUESTION # 55
A three phase, 380-volt system, has the following voltage measurements:
Va = 375 volts
Vb = 380 volts
Vc = 391 volts
Calculate the percent voltage imbalance.
- A. 1.1%
- B. 2.4%
- C. 5.5%
- D. 3.4%
- E. 6.2%
Answer: B
NEW QUESTION # 56
Which electric rate tariff would best cost justify a thermal energy storage (TES) system?
- A. High electricity rate and low peak-demand rate
- B. Great differential between high season and low season electricity rates
- C. Low electricity rate and low peak-demand rate
- D. Great differential between off-peak and on-peak time-of-use electricity rates
- E. Great differential between high season and low season demand rates
Answer: D
NEW QUESTION # 57
In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux.
To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.
- A. 176 lux
- B. 166 lux
- C. 150 lux
- D. 227 lux
- E. 276 lux
Answer: A
NEW QUESTION # 58
Which is the best application for variable-speed drives?
- A. Centrifugal fan motor in a multi-zone air conditioning system
- B. Centrifugal fan motor in a variable-air volume air-conditioning system
- C. Waste-water sewer lift pump
- D. Reciprocating air compressor
Answer: B
NEW QUESTION # 59
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. $2,244/month
- B. $187/month
- C. $0/month
- D. $3,370/month
- E. $1,875/month
Answer: E
Explanation:
To calculate the additional cost due to a power factor of less than 100%, follow these steps:
Step 1: Convert Real Power (kW) to Apparent Power (kVA)
Step 2: Compute Additional kVA Due to Power Factor
NEW QUESTION # 60
In a typical compressed air system, energy can be saved by which of the following actions?
- A. Raising the air pressure
- B. Reducing the air distribution pipe size
- C. Decreasing supply air pressure
- D. Move the inlet air filter to a warmer location
- E. Reducing the capacity of the compressed air receiver tanks
Answer: C
NEW QUESTION # 61
Which type of single-phase alternating-current motor has the highest efficiency?
- A. Permanent split-capacitor motor
- B. Electronic-commutated motor
- C. Shaded-pole motor
Answer: B
NEW QUESTION # 62
A desk lamp is located inside a windowless office. The office is heated during the winter and cooled during the summer. When the lamp is switched on, how much of the energy consumed by the lamp becomes heat in the office space?
- A. 100%
- B. 80%
- C. 25%
- D. 120%
Answer: A
Explanation:
* All electrical energy consumed by the lamp is converted into heatwithin the space, either as direct heat or as waste heat from the light source.
* In a windowless office, no energy escapes as light.The light energy that is emitted eventually turns into heat through absorption by surfaces.
Thus, the correct answer isC. 100%.
NEW QUESTION # 63
An air-conditioning unit delivers 10,000 kJ/h (thermal cooling). The equipment uses single-phase electrical power at 220-volt and 5.25 amps with a power factor of 100%. Calculate the coefficient of performance (COP).
- A. 6.2
- B. 16.1
- C. 2.4
- D. 3.2
- E. 13.2
Answer: D
Explanation:
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NEW QUESTION # 64
Which of the following is a closed-loop controller?
- A. Time clock schedule controller
- B. Thermostat for an air conditioning unit
- C. Accelerator pedal in an automobile
- D. Manual dimmer for a light switch
Answer: B
NEW QUESTION # 65
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
- A. Look for opportunities for energy improvement and to minimize bureaucracy inthe energy management system
- B. Review the written procedures related to the area under audit
- C. Assess actual activities as practiced against what the written procedures state
- D. Focus on the areas of significant energy use
- E. All of the above
Answer: E
Explanation:
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.
NEW QUESTION # 66
Which of the following color temperatures looks more like daylight?
- A. 3,500 K
- B. 4,500 K
- C. 2,500 K
- D. 6,500 K
Answer: D
NEW QUESTION # 67
A concentrating solar thermal system collects 5 GJ/h of thermal heat, which is delivered to a 94% efficient hot water generator. The hot water generator is used to raise the water temperature from 15°C to 65°C. The specific heat of water (Cp) is 4.2 kJ/kg-°C. What flow rate (liter/second) of hot water can be delivered from the hot water generator?
- A. 9.2 liter/second
- B. 6.2 liter/second
- C. 12.0 liter/second
- D. 4.2 liter/second
Answer: A
Explanation:
Step 1: Compute Useful Thermal Energy Output
Given:
* Solar system delivers5 GJ/h
* Hot water generator efficiency= 94%
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NEW QUESTION # 68
An energy project implemented today saves $10,000 per year for the next 20 years. Using the 5% interest table, determine the total value of savings at the end of the 20th year?
- A. $124,620
- B. $200,000
- C. $146,907
- D. $496,991
- E. $330,660
Answer: D
NEW QUESTION # 69
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?
- A. 17°C
- B. 21°C
- C. 25°C
- D. 13°C
Answer: A
NEW QUESTION # 70
In a performance contract, which group has the greatest investment risk?
- A. Risk is shared by the terms in the performance contract
- B. The equipment manufacturer
- C. The energy-service company
- D. The company installing the energy project
Answer: C
Explanation:
In a guaranteed savings performance contract, the ESCO assumes the greatest financial risk, because:
* Payments are tied to verified savings
* ESCO must compensate shortfalls if savings are not achieved
This principle is explicitly tested in the CEM exam.
NEW QUESTION # 71
What is the purpose of monitoring energy consumption?
SELECT THE CORRECT ANSWER
- A. To establish a basis of management control
- B. To establish when and why there is a deviation in energy consumption patterns
- C. To support analysis of energy information
- D. All of the above
Answer: D
Explanation:
Monitoring energy consumption is a critical component of effective energy management. It serves multiple purposes that collectively enhance an organization's ability to control energy use, identify inefficiencies, and implement improvements. These purposes include:
* Establishing a Basis of Management Control:By systematically tracking energy consumption, organizations create a foundation for managing energy use effectively. This data enables the setting of benchmarks and performance indicators, facilitating informed decision-making and strategic planning.
* Identifying Deviations in Energy Consumption Patterns:Continuous monitoring allows for the detection of anomalies or unexpected changes in energy usage. Recognizing when and why these deviations occur is essential for diagnosing potential issues, such as equipment malfunctions or operational inefficiencies, and addressing them promptly.
* Supporting Analysis of Energy Information:Comprehensive energy data collection supports detailed analysis, aiding in understanding consumption trends, evaluating the impact of energy conservation measures, and identifying opportunities for further efficiency improvements.
Given that monitoring energy consumption fulfills all the above functions, the correct answer is D. All of the above.
NEW QUESTION # 72
What is the main cause of low power factor?
- A. Solar flares
- B. Fluorescent lighting
- C. Computers and electronic equipment
- D. Low-load induction motors
- E. Harmonics
Answer: D
NEW QUESTION # 73
Which of the following is NOT included in commissioning documentation?
- A. As-built drawings
- B. Original facility and equipment design intent
- C. Financing payment structure reports
- D. Equipment operations and maintenance manuals
- E. Equipment control sequence documentation
Answer: C
NEW QUESTION # 74
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