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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) 62%
C) 74%
D) 88%

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

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

3. The temperature in an unconditioned mechanical room is found to typically be around 23°C warmer than ambient (outside) air. If the air intake of an air compressor located in the mechanical room is routed through a nearby wall so that the cooler outside air is fed directly to the air compressor's intake, the compressor's energy requirement will now be expected to:
SELECT THE CORRECT ANSWER

A) Decrease by 3.8%
B) Increase by 7.6%
C) Decrease by 7.6%
D) Remain the same
E) Increase by 3.8%

4. A piece of equipment costs $250,000 to buy and install. The annual operating cost for the equipment is
$50,000 per year. The equipment will last 15 years. After 15 years, the equipment will have no net salvage value. The annual interest rate is 10%. What is the present value of the life-cycle cost to own and operate the equipment? Use end-of-year annual cash flow analysis.

A) $756,113
B) $630,300
C) $556,945
D) $250,000

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.

A) 5.5%
B) 2.4%
C) 1.1%
D) 3.4%
E) 6.2%

Solutions: