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AEE Certified Energy Manager (CEM) Sample Questions:
1. Which of the advantages listed below, makes an ice TES system more preferred over a water TES system, when a load shifting strategy is considered?
A) Ice-storage systems require lower maintenance due to lower pumping volume
B) Ice-storage systems operate with a higher coefficient of performance (COP)
C) Water-storage systems require smaller storage tanks since water has a higher density than ice
D) Ice-storage systems require smaller storage tanks since ice has a higher energy storage density
2. A 55-kW motor at full load is used to drive a pump that generates 50 meters of head while pumping water at a rate of 5,000 liters per minute. Calculate the pump efficiency.
A) 62%
B) 88%
C) 74%
D) 58%
3. 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 expansion valve, before the evaporator coil
B) After the condenser coil, before the thermal expansion valve
C) After the compressor, before the condenser coil
D) After the evaporator coil, before the compressor
4. A compressed-air distribution system has one section that frequently has low pressure when demand for compressed air is high. How can you resolve the problem without increasing energy consumption?
A) Install a receiver tank near the remote load experiencing low pressure
B) Raise the supply air pressure
C) Answers B and C
D) Decrease the distribution pipe size to the remote load experiencing low pressure
5. How much fuel is required to heat 50 kg water from 20°C water to 200°C saturated steam? Assume the boiler is 80% efficient (based on the higher-heating value of the fuel).
A) 511.2 MJ
B) 210.5 MJ
C) 169.3 MJ
D) 127.2 MJ
Solutions:
Question # 1 Answer: D | Question # 2 Answer: C | Question # 3 Answer: C | Question # 4 Answer: A | Question # 5 Answer: C |