Which of the following controls can optimize the operation of lighting systems?

A. Dimming ballasts

B. Photocells

C. Occupancy sensors

D. Timer

E. All of the above

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

A. A building filled with manufacturing and process equipment

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

C. A computer data center housing multiple internet server racks

D. An underground storage facility

How does an enthalpy-based economizer control operate?

A. Using a constant mixed air proportion control sequence

B. Comparing the difference in dry-bulb air temperature measurements of the return air and the outdoor air

C. Measuring the outdoor air dry-bulb temperature and relative humidity

D. Using the dry-bulb temperature and relative humidity of both the outdoor-air and returnair

Which of the advantages listed below, makes an ice TES system more preferred over a water TES system, when a load shifting strategy is considered?

A. Ice-storage systems operate with a higher coefficient of performance (COP)

B. Ice-storage systems require smaller storage tanks since ice has a higher energy storage density

C. Water-storage systems require smaller storage tanks since water has a higher density than ice

D. Ice-storage systems require lower maintenance due to lower pumping volume

A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from 7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A. 8,250 liters/minute

B. 16,500 liters/minute

C. 22,750 liters/minute

D. 32,000 liters/minute

E. 48,250 liters/minute

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

A. Some form of fluorocarbon

B. Water

C. Lithium bromide

D. Ammonia

According to the institute of Electrical and Electronic Engineers (IEEE) standard 519. "Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems." the maximum total harmonic distortion (THD) for general low voltage systems less than 600 votts) should be: SELECT THE CORRECT ANSWER

A. Less than 20%

B. Less than 10%

C. Less than 5%

D. Less than 1%

E. Greater than 1%

What term describes the difference between the control signal value and the set point?

A. Differential

B. Dead band

C. Error or offset

D. Cut off

E. Dead time

A new energy-efficient boiler costs $60,890 to buy and install. The new energy-efficient boiler will save $15,400 per year and last for 20 years. What is the internal rate of return (IRR) of the project?

A. 10%

B. 15%

C. 20%

D. 25%

E. 30%

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?

A. 0.160

B. 0.214

C. 4.676

D. 6.259

An air conditioning unit cools make-up air from 25°C (dry bulb temperature) and 50% relative humidity down to 13°C. What type of heat has been removed from the air?

A. Sensible heat

B. Latent heat

C. Both sensible and latent heat

D. No heat energy has been removed

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?

A. Chilled-water temperature reset

B. Condenser-water temperature reset

C. Chiller demand limiting

D. Static-pressure reset