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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 25-kW motor, at full load, drives a centrifugal fan that produces 160,000 liters per second (l/s) of ventilation air. If the fan speed is reduced to a flow rate of 150,000 l/s, what is the new load on the motor?

A) 24.2 kW
B) 30.3 kW
C) 20.6 kW
D) 25.0 kW
E) 15.2 kW

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

3. Using the natural gas combustion efficiency tables in your workbook, find the combustion efficiency (based on higher-heating value) of a natural-gas-fired boiler if the excess air level is measured at 31.9% and the stack temperature rise is 187.8°C.

A) 76%
B) 82%
C) 78%
D) 84%
E) 80%

4. Which of the following steam turbines will have a single exit steam outlet at an intermediate steam pressure (higher than atmospheric pressure) that is useable in other industrial processes?
SELECT THE CORRECT ANSWER

A) Extraction turbine
B) Back-pressure turbine
C) Condensing turbine

5. 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) 88%
B) 58%
C) 74%
D) 62%

Solutions: