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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 55-kW motor at full load is used to drive a pump that generates 50 meters of head while pumping water at a rate of 5,000 liters per minute. Calculate the pump efficiency.

A) 58%
B) 88%
C) 74%
D) 62%

2. Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

A) Transmission power losses (12R) are less
B) Higher voltages are more stable
C) Electrical frequency is more stable
D) Higher voltages are safer

3. Which is the best application for variable-speed drives?

A) Reciprocating air compressor
B) Waste-water sewer lift pump
C) Centrifugal fan motor in a multi-zone air conditioning system
D) Centrifugal fan motor in a variable-air volume air-conditioning system

4. An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. What is the simple payback of the project?

A) 4.0 years
B) 5.0 years
C) 3.0 years
D) 2.0 years

5. A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?

A) Yes
B) No

Solutions: