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AEE Certified Energy Manager (CEM) Sample Questions:

1. How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 510 kJ
B) 420 kJ
C) 840 kJ
D) 630 kJ

2. 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) 9.2 liter/second
B) 12.0 liter/second
C) 6.2 liter/second
D) 4.2 liter/second

3. An office building is illuminated with T8 fluorescent lamps. Which of the following is the best schedule for group relamping (total replacement of all the T8 fluorescent lamps in the building)?

A) When 20% of the ballasts have failed
B) When 25% of the lamps have failed
C) When the building owner changes
D) Every 4 years
E) When you reach 70% of the rated lamp life

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

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

5. 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) 0.6
B) 0.8
C) 1.2
D) 1.4
E) 1.6

Solutions: