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AEE Certified Energy Manager (CEM) Sample Questions:

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

2. In a typical compressed air system, energy can be saved by which of the following actions?

A) Reducing the capacity of the compressed air receiver tanks
B) Decreasing supply air pressure
C) Move the inlet air filter to a warmer location
D) Raising the air pressure
E) Reducing the air distribution pipe size

3. Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

A) Higher voltages are safer
B) Transmission power losses (12R) are less
C) Electrical frequency is more stable
D) Higher voltages are more stable

4. What instrument determines flow rate by measuring pressure differential?

A) Hot-wire anemometer
B) Pitot tube
C) Infrared camera
D) Psychrometer
E) Ultrasonic flow meter

5. A 50-kW induction motor (1,500 rpm synchronous speed) has a nameplate full-load rotational speed of 1,455 rpm. Field measurements show the actual rotational speed is 1,475 rpm. Using the slip method, calculate the partial load factor of the motor.

A) 46%
B) 80%
C) 98%
D) 101%
E) 56%

Solutions: