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AEE Certified Energy Manager (CEM) Sample Questions:

1. Periodic commissioning of a building automation system (BAS) might include which of the following?

A) Verify controls are still responsive to the BAS
B) Answers A and C
C) Retraining staff on the BAS functions and programming
D) All of the above
E) Removing temperature set point overrides

2. How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 510 kJ
B) 840 kJ
C) 420 kJ
D) 630 kJ

3. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 4,180 m³
B) 766 m³
C) 1,191 m³
D) 2,618 m³
E) 1,356 m³

4. 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) 20.6 kW
B) 24.2 kW
C) 30.3 kW
D) 15.2 kW
E) 25.0 kW

5. The set point for the chiller supply water temperature is varied as a function of the thermal demand for space cooling. What do you call this control strategy?

A) Condenser-water temperature reset
B) Night setback
C) Reheat coil reset
D) Chilled-water temperature reset

Solutions: