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AEE Certified Energy Manager (CEM) Sample Questions:

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

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

2. A motor operates with a normal and constant load. The electric current is measured to be 25% of the motor's nameplate rating. What does this mean?

A) The motor is operating at high efficiency
B) The applied voltage is too high and should be reduced to improve efficiency
C) The applied voltage is too low and should be increased to improve efficiency
D) The motor is oversized and may be downsized to increase efficiency

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

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

4. A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.

A) 32,000 liters/minute
B) 16,500 liters/minute
C) 22,750 liters/minute
D) 8,250 liters/minute
E) 48,250 liters/minute

5. 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) 34.9%
B) 42.7%
C) 28.4%
D) 59.3%

Solutions: