Updated: Jul 11, 2026
No. of Questions: 146 Questions & Answers with Testing Engine
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1. A new lighting system costs $60,000. The new lighting system has a 15-year life and the minimum required rate of return (MARR) is 15%. How much must the new lighting system save to be life-cycle cost effective?
A) $33,200/year
B) $27,090/year
C) $12,556/year
D) $15,650/year
E) $10,260/year
2. A concentrating solar thermal system collects 5 GJ/h of thermal heat, which is delivered to a 94% efficient hot water generator. The hot water generator is used to raise the water temperature from 15°C to 65°C. The specific heat of water (Cp) is 4.2 kJ/kg-°C. What flow rate (liter/second) of hot water can be delivered from the hot water generator?
A) 9.2 liter/second
B) 6.2 liter/second
C) 4.2 liter/second
D) 12.0 liter/second
3. 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)?
A) 5 months
B) 85.7 months
C) 60 months
D) 68 months
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) 88%
C) 62%
D) 58%
5. A new energy-efficient boiler costs $60,890 to buy and install. The new energy-efficient boiler will save
$15,400 per year and last for 20 years. What is the internal rate of return (IRR) of the project?
A) 20%
B) 10%
C) 30%
D) 25%
E) 15%
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A | Question # 3 Answer: B | Question # 4 Answer: A | Question # 5 Answer: A |
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