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AEE Certified Energy Manager (CEM) Sample Questions:

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

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

2. A controller has a signal output that can range from 4 to 20 mA (milli-amperes). The controller regulates the output temperature from a three-way mixing valve from 5°C to 15°C. What is the control gain?

A) 0.8
B) 1.6
C) 1.4
D) 1.2
E) 0.6

3. An air-conditioning unit delivers 10,000 kJ/h (thermal cooling). The equipment uses single-phase electrical power at 220-volt and 5.25 amps with a power factor of 100%. Calculate the coefficient of performance (COP).

A) 13.2
B) 6.2
C) 3.2
D) 2.4
E) 16.1

4. A 55-kW motor at full load is used to drive a pump that generates 50 meters of head while pumping water at a rate of 5,000 liters per minute. Calculate the pump efficiency.

A) 62%
B) 88%
C) 74%
D) 58%

5. What is a common cause of poor power quality?

A) Partially loaded induction motors
B) Incandescent lighting
C) Synchronous motors
D) Natural gas turbine power generation by utilities
E) Electronic equipment, such as personal computers

Solutions: