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AEE Certified Energy Manager (CEM) Sample Questions:
1. 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) $1.44
B) $0.38
C) $0.25
D) $0.76
E) $1.25
2. Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER
A) R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
B) R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
C) R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact
D) 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
E) R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
3. Which type of single-phase alternating-current motor has the highest efficiency?
A) Shaded-pole motor
B) Electronic-commutated motor
C) Permanent split-capacitor motor
4. A facility owner is considering installing a new chiller. The installed project cost will be $300,000. The annual savings from the energy-saving project will be $45,000 for the 20-year life of the chiller. If an energy- service company requires a minimum 20% return on investment (pre-tax), will the energy-service company agree to finance this project?
A) No
B) Yes
5. A three phase, 380.volt system has the following voltage measurements:
Va = 375$ volts
Vb = 380$ volts
Vc = 391$ volts
Calculate the percent voltage imbalance.
SELECT THE CORRECT ANSWER
A) 2.4%
B) 5.5%
C) 1.1%
D) 3.4%
E) 6.2%
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: A | Question # 5 Answer: A |
By Jonas
