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AEE Certified Energy Manager (CEM) Sample Questions:

1. What type of heat transfer is reduced by adding insulation to the inside surface of a wall?

A) Convection
B) Radiation
C) Conduction

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

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

3. Which motor parameter is the most difficult to measure with precision?

A) Alternating current (AC) frequency
B) Output power capacity
C) Operating load factor
D) Operating (rotating) speed
E) Input power

4. A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A) 28.4%
B) 34.9%
C) 59.3%
D) 42.7%

5. A building is conditioned by an air-conditioning and heating system. What technology can directly prevent simultaneous heating and cooling of the space?

A) Air handling unit
B) Indoor air quality sensors
C) Derivative control
D) Variable air volume control
E) Setback thermostat

Solutions: