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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 50-Hz alternating current (AC) induction motor has 3 pole pairs (6 poles). What is the synchronous speed of the motor?

A) 750 rpm
B) 600 rpm
C) 1,500 rpm
D) 1,000 rpm

2. If the temperature difference across an external wall is 20°C and the heat flow across the wall is 2.5 Watts/m², calculate the insulation value of the wall (including inside and outside air films)?

A) R = 4 m²-°C/W
B) R = 6 m²-°C/W
C) R = 12 m²-°C/W
D) R = 10 m²-°C/W
E) R = 8 m²-°C/W

3. Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?

A) This cycle is not a combined heat and power system
B) Topping cycle
C) Combined cycle
D) Bottoming cycle

4. Using the lumen method, calculate the number of luminaires (fixtures) required to light a room to 200 lux.
Each luminaire has 2 fluorescent lamps, 3,000 lumens per lamp. The room is 20 meters by 30 meters. The total light loss factor (LLF) is 0.70 and the luminaire coefficient of utilization (CU) is 0.80.

A) 60 luminaires
B) 36 luminaires
C) 48 luminaires
D) 12 luminaires
E) 24 luminaires

5. A fully-loaded heat pump unit delivers 36-kW thermal heating with a power draw of 12-kW electric. What is the coefficient of performance (COP) at full load?

A) 2.0
B) 5.0
C) 4.0
D) 6.0
E) 3.0

Solutions: