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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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) 1.4
B) 0.6
C) 1.2
D) 0.8
E) 1.6

2. Some international electric utilities use 'net metering" for customers with renewable energy equipment, such as photovoltaic power panels. Which of the following best describes net metering with regard to excess power generation and utility billing practices?
SELECT THE CORRECT ANSWER

A) Accept excess electric energy generated by a customer's energy system, the value of which can offset the value of energy consumed by the customer over the net metering period
B) Transmit electric energy generated by a customer's energy system so that the customer may sell the excess electricity to another company on the transmission system
C) Accept excess electric energy generated by a customer's energy system but with no financial compensation for the energy fed into the utility's transmission system

3. Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

A) $0.25
B) $0.76
C) $0.38
D) $1.44
E) $1.25

4. A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?

A) Static-pressure reset
B) Chilled-water temperature reset
C) Condenser-water temperature reset
D) Chiller demand limiting

5. A 7 bar (gauge pressure) compressed air system has 5 leaks that are 3 mm in diameter and 3 leaks that are 6 mm in diameter. The compressed-air system is pressurized 8,760 hours per year. Electricity cost is $0.10
/kWh. What is the annual cost of the leaks in the compressed air system?

A) $30,910/yr
B) $25,220/yr
C) $48,480/yr
D) $56,500/yr
E) $18,150/yr

Solutions: