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AEE Certified Energy Manager (CEM) Sample Questions:

1. 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) Static-pressure reset
C) Condenser-water temperature reset
D) Chiller demand limiting

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

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

3. Which of the advantages listed below, makes an ice TES system more preferred over a water TES system, when a load shifting strategy is considered?

A) Ice-storage systems operate with a higher coefficient of performance (COP)
B) Ice-storage systems require lower maintenance due to lower pumping volume
C) Ice-storage systems require smaller storage tanks since ice has a higher energy storage density
D) Water-storage systems require smaller storage tanks since water has a higher density than ice

4. 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) 3.4%
B) 1.1%
C) 2.4%
D) 5.5%
E) 6.2%

5. A fully-loaded heat pump unit delivers 36-kW thermal heating with a power draw of 12-kW electric. What is the coefficient of performance (COP) at full load?

A) 4.0
B) 5.0
C) 6.0
D) 2.0
E) 3.0

Solutions: