AEE CEM : Certified Energy Manager (CEM)

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AEE Certified Energy Manager (CEM) Sample Questions:

1. If outside air has a temperature of 30°C dry bulb and 20°C wet bulb, what is the dew point temperature?

A) 20°C
B) 15°C
C) 25°C
D) 30°C

2. Which pump system listed below is most likely the best application for converting to variable-speed drive for energy savings?
SELECT THE CORRECT ANSWER

A) Piston pump operating at full capacity with throttle valve fully open, transferring liquid from an underground dam to the roof of a building
B) Reciprocating pump with on-off control, transferring liquid vertically for one hour per day
C) Positive displacement rotary lobe pumps in parallel, in a constant flow rebar quenching application with a static head of 80 m and negligible friction head
D) Centrifugal pump varying its flowrate with bypass control, circulating liquid in a closed loop cooling system

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

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

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

5. If the temperature difference across an external wall is 20°C and the heat flow across the wall is 2.5 Watts/m², calculate the insulation value of the wall (including inside and outside air films)?

A) R = 10 m²-°C/W
B) R = 8 m²-°C/W
C) R = 6 m²-°C/W
D) R = 4 m²-°C/W
E) R = 12 m²-°C/W

Solutions: