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AEE Certified Energy Manager (CEM) Sample Questions:
1. A 100-kW electrical load has a power factor of 75%. What capacitance, in KVAR, will improve the power factor to 95%?
A) 55.3 kVAR
B) 15.7 kVAR
C) 25.3 kVAR
D) 45.2 kVAR
E) 33.1 kVAR
2. A 50-Hz alternating current (AC) induction motor has 3 pole pairs (6 poles). What is the synchronous speed of the motor?
A) 1,500 rpm
B) 1,000 rpm
C) 600 rpm
D) 750 rpm
3. An energy-saving project saves $30,000 per year. The project life is 10 years and the company minimum annual rate of return (MARR) is 15%. How much can the project cost and still be cost effective?
A) $150,570
B) $165,903
C) $198,992
D) $201,123
E) $188,343
4. 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) 74%
B) 62%
C) 88%
D) 58%
5. Lighting systems operate with a certain recoverable light loss factor. Control systems with photocell sensor inputs combined with dimming ballasts can be used to regulate dimming levels to maintain a continuous light level in the work space. Which of the following best describes this type of control?
A) Two-position controller
B) Demand-limiting controller
C) Closed-loop controller
D) Open-loop controller
Solutions:
Question # 1 Answer: C | Question # 2 Answer: A | Question # 3 Answer: B | Question # 4 Answer: A | Question # 5 Answer: C |