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AEE Certified Energy Manager (CEM) Sample Questions:

1. A heat pump water heater has an annual average coefficient of performance (COP) of 2.1 and heats water from 15°C to 50°C. Hot water use is 100 liters per day, 365 days/yr. The electricity cost is $0.10/kWh. What is the annual water heating cost? (The specific heat of water (C) is 4.2 kJ/kg-°C.)

A) $70.97/year
B) $64.66/year
C) $44.88/year
D) $52.20/year
E) $88.29/year

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) 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
C) Centrifugal pump varying its flowrate with bypass control, circulating liquid in a closed loop cooling system
D) Reciprocating pump with on-off control, transferring liquid vertically for one hour per day

3. A three phase, 380.volt system has the following voltage measurements:
Va = 375$ volts
Vb = 380$ volts
Vc = 391$ volts
Calculate the percent voltage imbalance.
SELECT THE CORRECT ANSWER

A) 6.2%
B) 5.5%
C) 1.1%
D) 2.4%
E) 3.4%

4. Air is heated from 10°C (dry bulb temperature) and 80% relative humidity to 32°C (dry bulb temperature).
What is the new relative humidity?

A) 80%
B) 30%
C) 40%
D) 60%
E) 20%

5. If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?

A) Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
B) Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space
C) Group relamping cannot reduce the number of lamps required to illuminate a space
D) Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space
E) Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.

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