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AEE Certified Energy Manager (CEM) Sample Questions:

1. A controlled valve is full closed when it gets a signal of 4 mA. The valve is full open when it gets a signal of
20 mA. With a control signal of 8 mA, what is the valve position?

A) 75% open
B) 45% open
C) 82% open
D) 25% open
E) 12.5% open

2. A 100-kW electrical load has a power factor of 75%. What capacitance, in KVAR, will improve the power factor to 95%?

A) 25.3 kVAR
B) 45.2 kVAR
C) 15.7 kVAR
D) 55.3 kVAR
E) 33.1 kVAR

3. Which of the following best describes a dead band in controls?

A) A system which changes the output of a controller based on how fast a variable is moving from or to a set point
B) The delay in response of a system to a controlled change
C) A value that has been assigned to a controlled variable
D) A range around a set point with no change in state even though there is a change in sensor input
E) The difference between a sensor variable and its set point

4. If outside air has a temperature of 30°C dry bulb and 20°C wet bulb, what is the dew point temperature?

A) 30°C
B) 25°C
C) 15°C
D) 20°C

5. A cooling tower is delivering water to a chilled-water plant. The cooling tower outlet temperature has a 6°C approach temperature to the ambient air, wet-bulb temperature. The outside air conditions are 20°C dry bulb,
60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?

A) 21°C
B) 25°C
C) 17°C
D) 13°C

Solutions: