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AEE Certified Energy Manager (CEM) Sample Questions:

1. A refrigerant-to-water heat exchanger can be added to air-conditioning equipment to heat water using the waste heat in the vapor compression refrigerant cycle. Where is this type of heat exchanger located in the refrigerant loop?

A) After the expansion valve, before the evaporator coil
B) After the evaporator coil, before the compressor
C) After the condenser coil, before the thermal expansion valve
D) After the compressor, before the condenser coil

2. A motor operates with a normal and constant load. The electric current is measured to be 25% of the motor's nameplate rating. What does this mean?

A) The applied voltage is too low and should be increased to improve efficiency
B) The motor is operating at high efficiency
C) The applied voltage is too high and should be reduced to improve efficiency
D) The motor is oversized and may be downsized to increase efficiency

3. What is the main cause of low power factor?

A) Fluorescent lighting
B) Computers and electronic equipment
C) Low-load induction motors
D) Harmonics
E) Solar flares

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

5. A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?

A) Yes
B) No

Solutions: