AEE Certified Energy Manager (CEM) : CEM valid dump

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AEE CEM Exam Syllabus Topics:

AEE Certified Energy Manager (CEM) Sample Questions:

1. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 4,180 m³
B) 766 m³
C) 2,618 m³
D) 1,191 m³
E) 1,356 m³

2. 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) 2.4%
B) 5.5%
C) 3.4%
D) 6.2%
E) 1.1%

3. An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?

A) $1,800/yr
B) $2,200/yr
C) $1,500/yr
D) $2,600/yr
E) $1,200/yr

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

5. Which problems can be caused by poor power quality?

A) All of the above
B) Equipment overheating
C) Induction motors running backwards
D) Answers B and C
E) Circuit breakers tripping

Solutions: