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AEE CEM Exam Syllabus Topics:

AEE Certified Energy Manager (CEM) Sample Questions:

1. 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 throttle fully open circulating liquid in a closed loop cooling system
D) Pump system with parallel rotary lobe pumps in a rebar quenching application with a static head of 80m

2. 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) $52.20/year
B) $64.66/year
C) $88.29/year
D) $70.97/year
E) $44.88/year

3. 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) 48,250 liters/minute
B) 8,250 liters/minute
C) 16,500 liters/minute
D) 22,750 liters/minute
E) 32,000 liters/minute

4. Using an interest rate of 15%, an energy project has a net-present value (NPV) of $3,500. Which statement is true about the project's internal rate of return (IRR)?

A) IRR = 15%
B) IRR < 15%
C) IRR < 0%
D) IRR > 15%

5. 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.

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

Solutions: