Updated: Jul 06, 2026
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1. You can buy air compressor A for $15,000 or air compressor B for $6,000. Compressor A will cost $10,000 per year to operate. Compressor B will cost $11,500 per year to operate. If both air compressors have a 10- year life and your required return on investment is 12%, which air compressor has the lowest total life-cycle cost?
A) Both air compressors have the same life-cycle cost
B) Compressor A
C) Compressor B
2. A 75-kW induction motor operates at 80% partial load and 88% efficiency. A new high-efficiency 75-kW motor can be installed that will operate at 95% efficiency (also at 80% partial load). What is the reduction in electric power demand?
A) 4 kW
B) 5 kW
C) 2 kW
D) 1 kW
E) 8 kW
3. Which of the following is NOT a typical benefit of performance contracting from the building owner's perspective?
A) Performance contracting can provide access to external financing when the owner may not have sufficient equity for in-house financing for large projects
B) The energy-service company can have a financial incentive to achieve projected savings
C) Net cash flow can be neutral or positive for the owner
D) Performance contracting is a simple and quick process
E) Maintenance services provided by the performance contractor can add value to the overall savings achieved
4. 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?
A) 25% open
B) 45% open
C) 82% open
D) 75% open
E) 12.5% open
5. A 50-kW induction motor (1,500 rpm synchronous speed) has a nameplate full-load rotational speed of 1,455 rpm. Field measurements show the actual rotational speed is 1,475 rpm. Using the slip method, calculate the partial load factor of the motor.
A) 56%
B) 101%
C) 46%
D) 98%
E) 80%
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A | Question # 3 Answer: D | Question # 4 Answer: A | Question # 5 Answer: A |
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