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AEE Certified Energy Manager (CEM) Sample Questions:

1. What is a common method to reduce the impact of voltage imbalance?

A) Rebalance single-phase loads
B) Install harmonic filters
C) Install capacitors to improve power factor on three-phase loads
D) Reverse phase connections on three-phase motors

2. Using a degree-day base of 18°C, calculate the number of cooling degree days (CDD) if the outside temperature is a uniform 25°C throughout the year (365 days/year).

A) 2,250 CDD/yr
B) 1,955 CDD/yr
C) 1,845 CDD/yr
D) 2,555 CDD/yr
E) 2,975 CDD/yr

3. A controller has a signal output that can range from 4 to 20 mA (milli-amperes). The controller regulates the output temperature from a three-way mixing valve from 5°C to 15°C. What is the control gain?

A) 1.2
B) 0.6
C) 0.8
D) 1.6
E) 1.4

4. 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) $70.97/year
C) $64.66/year
D) $88.29/year
E) $44.88/year

5. A piece of equipment costs $250,000 to buy and install. The annual operating cost for the equipment is
$50,000 per year. The equipment will last 15 years. After 15 years, the equipment will have no net salvage value. The annual interest rate is 10%. What is the present value of the life-cycle cost to own and operate the equipment? Use end-of-year annual cash flow analysis.

A) $756,113
B) $556,945
C) $250,000
D) $630,300

Solutions: