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AEE Certified Energy Manager (CEM) Sample Questions:

1. A 50-kW induction motor (1,500 rpm synchronous speed) has a nameplate full-load rotational speed of 1,455 rpm. Field measurements show the actual rotational speed is 1,475 rpm. Using the slip method, calculate the partial load factor of the motor.

A) 101%
B) 98%
C) 80%
D) 46%
E) 56%

2. If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?

A) Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space
B) Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.
C) Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
D) Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space
E) Group relamping cannot reduce the number of lamps required to illuminate a space

3. Thermal scans of electrical equipment are useful for:

A) Measuring the load on a refrigerant system
B) Reading current carrying capacity of installed conductors
C) Locating areas of high power factor
D) Locating a loose electrical connection

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

5. 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) 2.4
B) 6.2
C) 16.1
D) 3.2
E) 13.2

Solutions: