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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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) 511.2 MJ
B) 210.5 MJ
C) 169.3 MJ
D) 127.2 MJ

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

3. In an ammonia-water absorption chiller, what material is the refrigerant?

A) Ammonia
B) Some form of fluorocarbon
C) Lithium bromide
D) Water

4. A large office building is entirely fitted out with ten-thousand new T5 fluorescent lamps today, which will be operational for 2,500 hours per year. The lamps are supposed to last 17,860 hours. How many months from today will be the best schedule for group relamping (total replacement of all the T5 fluorescent lamps in the building)?

A) 60 months
B) 85.7 months
C) 5 months
D) 68 months

5. What term describes the difference between the control signal value and the set point?

A) Dead band
B) Cut off
C) Error or offset
D) Dead time
E) Differential

Solutions: