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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) A system which changes the output of a controller based on how fast a variable is moving from or to a set point
C) The delay in response of a system to a controlled change
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 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) 101%
B) 98%
C) 56%
D) 80%
E) 46%

3. An energy-saving project saves $30,000 per year. The project life is 10 years and the company minimum annual rate of return (MARR) is 15%. How much can the project cost and still be cost effective?

A) $188,343
B) $201,123
C) $198,992
D) $150,570
E) $165,903

4. Using the lumen method, calculate the number of luminaires (fixtures) required to light a room to 200 lux.
Each luminaire has 2 fluorescent lamps, 3,000 lumens per lamp. The room is 20 meters by 30 meters. The total light loss factor (LLF) is 0.70 and the luminaire coefficient of utilization (CU) is 0.80.

A) 24 luminaires
B) 48 luminaires
C) 12 luminaires
D) 36 luminaires
E) 60 luminaires

5. What is the Energy Use index (EUl) for a 4,000 m2 building that uses the following amounts of energy each year?

A) 403,311 kJ/m²-yr
B) 855,250 kJ/m²-yr
C) 1,612,000 kJ/m²-yr
D) 625,600 kJ/m²-yr
E) 3,220,800 kg/m²-yr

Solutions: