AEE CEM : Certified Energy Manager (CEM)

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AEE Certified Energy Manager (CEM) Sample Questions:

1. A compressed-air distribution system has one section that frequently has low pressure when demand for compressed air is high. How can you resolve the problem without increasing energy consumption?

A) Decrease the distribution pipe size to the remote load experiencing low pressure
B) Raise the supply air pressure
C) Answers B and C
D) Install a receiver tank near the remote load experiencing low pressure

2. A facility has a monthly peak power demand of 1,000 kW and an average power factor of 80%. The facility pays a demand charge of $7.50/kVA-month. What is the additional cost per month because the power factor is less than 100%?

A) $3,370/month
B) $187/month
C) $2,244/month
D) $1,875/month
E) $0/month

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

A) A value that has been assigned to a controlled variable
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) The difference between a sensor variable and its set point
E) A range around a set point with no change in state even though there is a change in sensor input

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

5. Which pump system listed below is most likely the best application for converting to variable-speed drive?

A) Pump system with bypass control transferring liquid from an intake dam to a process in production
B) Pump system with on-off control transferring liquid vertically from a low tank to a higher tank
C) Pump system with parallel rotary lobe pumps in a rebar quenching application with a static head of 80m
D) Pump system with throttle fully open circulating liquid in a closed loop cooling system

Solutions: