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AEE Certified Energy Manager (CEM) Sample Questions:

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

2. 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) 2.4%
B) 5.5%
C) 3.4%
D) 6.2%
E) 1.1%

3. Electricity costs SO. 10 per kWh. if an electric water heater has an efficiency of 95*6. what is the equivalent price of natural gas per Gigajoule for a natural gas water heater? The natural gas water heater has an efficiency of 95*t based on lower-heating value.
[Natural gas has an energy content of 36.400 K|/m3 (higher-heating value) and 32-760 K/m3 (lower-heating value).] SELECT THE CORRECT ANSWER

A) $33 /GJ
B) $15/GJ
C) $21 /GJ
D) $25 /GJ

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

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

5. A 100-kW electrical load has a power factor of 75%. What capacitance, in KVAR, will improve the power factor to 95%?

A) 45.2 kVAR
B) 33.1 kVAR
C) 55.3 kVAR
D) 15.7 kVAR
E) 25.3 kVAR

Solutions: