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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 75-kW induction motor operates at 80% partial load and 88% efficiency. A new high-efficiency 75-kW motor can be installed that will operate at 95% efficiency (also at 80% partial load). What is the reduction in electric power demand?

A) 4 kW
B) 2 kW
C) 5 kW
D) 1 kW
E) 8 kW

2. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 4,180 m³
B) 1,356 m³
C) 2,618 m³
D) 1,191 m³
E) 766 m³

3. Which is the best application for variable-speed drives?

A) Reciprocating air compressor
B) Waste-water sewer lift pump
C) Centrifugal fan motor in a variable-air volume air-conditioning system
D) Centrifugal fan motor in a multi-zone air conditioning system

4. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings in a project that upgraded lighting in a large manufacturing plant?

A) Option D - Calibrated simulation
B) Option C - Whole facility measurement
C) Option B - Retrofit isolation: all parameter measurement
D) Option E - Stipulated savings
E) Option A - Retrofit isolation: key parameter measurement

5. In a PID control system, what is the purpose of the Proportional Gain?

A) Reacts to change
B) Reduces/eliminates offset
C) Control point
D) Senses high load rate

Solutions: