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

2. 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) Yes
B) No

3. A controller has a signal output that can range from 4 to 20 mA (milli-amperes). The controller regulates the output temperature from a three-way mixing valve from 5°C to 15°C. What is the control gain?

A) 0.6
B) 1.4
C) 0.8
D) 1.2
E) 1.6

4. Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?

A) Bottoming cycle
B) This cycle is not a combined heat and power system
C) Combined cycle
D) Topping cycle

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

A) Run-around system
B) Ceramic recuperator
C) Shell and tube
D) Heat pipe
E) Desiccant heat wheel

Solutions: