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AEE Certified Energy Manager (CEM) Sample Questions:

1. Which of the following is a closed-loop controller?

A) Time clock schedule controller
B) Thermostat for an air conditioning unit
C) Manual dimmer for a light switch
D) Accelerator pedal in an automobile

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

A) The time at which 50% of a large sample of lamps have failed
B) The time at which 70% of a large sample of lamps have failed
C) The time at which lamps begin to fail
D) The time at which lumen output has reduced by 50%
E) The time at which lumen output has reduced to 70% of the initial light output

3. 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) 22,750 liters/minute
B) 8,250 liters/minute
C) 48,250 liters/minute
D) 32,000 liters/minute
E) 16,500 liters/minute

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

A) Lithium bromide
B) Water
C) Ammonia
D) Some form of fluorocarbon

5. Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER

A) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact
B) R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications
C) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
D) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
E) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact

Solutions: