Free and Premium AEE CEM Dumps Questions Answers

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?

What is the best type of heat exchanger to recover and transfer latent heat energy from one air stream to another?

The set point for the chiller supply water temperature is varied as a function of the thermal demand for space cooling. What do you call this control strategy?

In a PID control system, what is the purpose of the Proportional Gain?

If outside air has a temperature of 30°C dry bulb and 20°C wet bulb, what is the dew point temperature?

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.]

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 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?

Which of the following statements regarding refrigerants is NOT correct?

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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?

A building is conditioned by an air-conditioning and heating system. What technology can directly prevent simultaneous heating and cooling of the space?

A 100-kW electrical load has a power factor of 75%. What capacitance, in KVAR, will improve the power factor to 95%?

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

Which of the following statements best describe Demand Control Ventilation (DVC) in Building Automation Systems?

A compressed-air distribution system has one section that frequently has low pressure when demand for compressed air is high. How can you resolve the problem without increasing energy consumption?

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?

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]

Which is the best application for variable-speed drives?

What is the uniform series present worth factor (P/A, i%, n) for an annual interest rate of 15% and a lifetime of 20 years?

What is the definition of lamp life for a fluorescent lamp?

A 50-Hz alternating current (AC) induction motor has 3 pole pairs (6 poles). What is the synchronous speed of the motor?

Which motor parameter is the most difficult to measure with precision?

What instrument determines flow rate by measuring pressure differential?

Insulation has a thermal conductivity of 0.04 Watt/(m-°C). What is the R-value for this insulation when it is 5-cm thick?

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

What is a common cause of poor power quality?

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?

Lighting systems operate with a certain recoverable light loss factor. Control systems with photocell sensor inputs combined with dimming ballasts can be used to regulate dimming levels to maintain a continuous light level in the work space. Which of the following best describes this type of control?

In an ammonia-water absorption chiller, what material is the refrigerant?

Which of the following color temperatures looks more like daylight?

Why do electric utility companies transmit power at high voltages?

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What is the purpose of monitoring energy consumption?

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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 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 cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

When comparing two similar facilities, you see that the facility with newer, higher-efficiency equipment has a higher energy-use index [EUI] (kJ/m²-yr). What might be the cause?

How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

Which of the following is NOT a typical benefit of performance contracting from the building owner's perspective?

Which of the following instruments is most useful for tracking long-term boiler performance?