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AEE Certified Energy Manager (CEM) Sample Questions:

1. A concentrating solar thermal system collects 5 GJ/h of thermal heat, which is delivered to a 94% efficient hot water generator. The hot water generator is used to raise the water temperature from 15°C to 65°C. The specific heat of water (Cp) is 4.2 kJ/kg-°C. What flow rate (liter/second) of hot water can be delivered from the hot water generator?

A) 12.0 liter/second
B) 6.2 liter/second
C) 4.2 liter/second
D) 9.2 liter/second

2. A controlled valve is full closed when it gets a signal of 4 mA. The valve is full open when it gets a signal of
20 mA. With a control signal of 8 mA, what is the valve position?

A) 45% open
B) 82% open
C) 25% open
D) 12.5% open
E) 75% open

3. The set point for the chiller supply water temperature is varied as a function of the thermal demand for space cooling. What do you call this control strategy?

A) Night setback
B) Chilled-water temperature reset
C) Reheat coil reset
D) Condenser-water temperature reset

4. How much fuel is required to heat 50 kg water from 20°C water to 200°C saturated steam? Assume the boiler is 80% efficient (based on the higher-heating value of the fuel).

A) 210.5 MJ
B) 511.2 MJ
C) 169.3 MJ
D) 127.2 MJ

5. Infiltration (inward air leakage) in a building is dependent on several factors. Which of the following is least likely to affect or influence infiltration in a building?

A) Poor or missing weatherstripping
B) Outside air wind speed
C) Fuel type used for heating and cooling
D) Building height
E) Outside air temperature

Solutions: