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AEE Certified Energy Manager (CEM) Sample Questions:

1. Air is heated from 10°C (dry bulb temperature) and 80% relative humidity to 32°C (dry bulb temperature).
What is the new relative humidity?

A) 40%
B) 20%
C) 60%
D) 30%
E) 80%

2. In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux.
To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.

A) 276 lux
B) 176 lux
C) 150 lux
D) 227 lux
E) 166 lux

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

4. 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) 1.2
B) 1.4
C) 0.6
D) 0.8
E) 1.6

5. What type of heat transfer is reduced by adding insulation to the inside surface of a wall?

A) Radiation
B) Convection
C) Conduction

Solutions: