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AEE Certified Energy Manager (CEM) Sample Questions:

1. In an ammonia-water absorption chiller, what material is the refrigerant?

A) Some form of fluorocarbon
B) Ammonia
C) Lithium bromide
D) Water

2. Some international electric utilities use 'net metering" for customers with renewable energy equipment, such as photovoltaic power panels. Which of the following best describes net metering with regard to excess power generation and utility billing practices?
SELECT THE CORRECT ANSWER

A) Accept excess electric energy generated by a customer's energy system but with no financial compensation for the energy fed into the utility's transmission system
B) Transmit electric energy generated by a customer's energy system so that the customer may sell the excess electricity to another company on the transmission system
C) Accept excess electric energy generated by a customer's energy system, the value of which can offset the value of energy consumed by the customer over the net metering period

3. In a PID control system, what is the purpose of the Proportional Gain?

A) Reacts to change
B) Reduces/eliminates offset
C) Control point
D) Senses high load rate

4. A 7 bar (gauge pressure) compressed air system has 5 leaks that are 3 mm in diameter and 3 leaks that are 6 mm in diameter. The compressed-air system is pressurized 8,760 hours per year. Electricity cost is $0.10
/kWh. What is the annual cost of the leaks in the compressed air system?

A) $30,910/yr
B) $25,220/yr
C) $48,480/yr
D) $56,500/yr
E) $18,150/yr

5. A facility has the thermal cooling load profile shown in the table below. The utility rate tariff has an on-peak time-of-use billing period that begins at 10:00 a.m. and ends at 7:00 p.m. Calculate the storage capacity required for a load-shifting operating strategy, to make sure that no thermal cooling Is generated by the chiller during the on-peak utility rate period.

A) 48 GJ
B) 84 GJ
C) 66 GJ
D) 72 GJ

Solutions: