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AEE Certified Energy Manager (CEM) Sample Questions:

1. What instrument determines flow rate by measuring pressure differential?

A) Infrared camera
B) Pitot tube
C) Ultrasonic flow meter
D) Psychrometer
E) Hot-wire anemometer

2. A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A) 28.4%
B) 59.3%
C) 34.9%
D) 42.7%

3. An outdoor parking area has 25 light poles. Each pole has a 420 Watt (ballast included) high-pressure sodium (HPS) luminaire. The parking area lights are illuminated 4,500 hours per year and the electricity cost is $0.08
/kWh. What is the annual energy cost reduction if each luminaire is replaced with a 220-Watt (driver included) LED luminaire?

A) $1,200/yr
B) $2,200/yr
C) $2,600/yr
D) $1,500/yr
E) $1,800/yr

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

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

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

Solutions: