AEE CEM Actual Free Exam Questions & Community Discussion
Which of the following statements best describe Demand Control Ventilation (DVC) in Building Automation Systems?
Correct Answer: B
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A cooling tower delivers 29°C water to a central chilled water plant. The cooling tower is capable of delivering water to the chilled-water plant with a 6°C approach temperature to the ambient wet bulb temperature. Using this information, what type of control strategy would you recommend be added to the cooling tower operation to save additional energy?
Correct Answer: B
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A building is conditioned by an air-conditioning and heating system. What technology can directly prevent simultaneous heating and cooling of the space?
Correct Answer: B
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A heat pump water heater has an annual average coefficient of performance (COP) of 2.1 and heats water from 15°C to 50°C. Hot water use is 100 liters per day, 365 days/yr. The electricity cost is $0.10/kWh. What is the annual water heating cost? (The specific heat of water (C) is 4.2 kJ/kg-°C.)
Correct Answer: A
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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).
Correct Answer: E
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A controlled valve is full closed when it gets a signal of 4 mA. The valve is full open when it gets a signal of
20 mA. With a control signal of 8 mA, what is the valve position?
20 mA. With a control signal of 8 mA, what is the valve position?
Correct Answer: A
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In an ammonia-water absorption chiller, what material is the refrigerant?
Correct Answer: D
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A large office building is entirely fitted out with ten-thousand new T5 fluorescent lamps today, which will be operational for 2,500 hours per year. The lamps are supposed to last 17,860 hours. How many months from today will be the best schedule for group relamping (total replacement of all the T5 fluorescent lamps in the building)?
Correct Answer: A
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A cooling tower is delivering water to a chilled-water plant. The cooling tower outlet temperature has a 6°C approach temperature to the ambient air, wet-bulb temperature. The outside air conditions are 20°C dry bulb,
60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?
60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?
Correct Answer: B
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