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NEW QUESTION # 20
Calculate the monthly electric bill for a customer that used 400 kW and 75,000 kwh during one month. Use the following declining block structure for a monthly bill:
SELECT THE CORRECT ANSWER
- A. $3,280
- B. $9,660
- C. $4, 580
- D. $12,500
- E. $7,850
Answer: B
Explanation:
We need to calculate the monthly electric bill based on the given pricing structure.
Step 1: Identify Charges from the Table
* Customer charge:$50/month
* Peak demand charge:$10/kW-month
* Electric consumption charges:
* First25,000 kWh@$0.06/kWh
* Excess(75,000 - 25,000) = 50,000 kWh@$0.05/kWh
* Tax:20% of total
A screenshot of a calculator AI-generated content may be incorrect.
NEW QUESTION # 21
A gas-fired boiler is operating with 31.9% excess air. A feedwater economizer is used to reduce the stack temperature rise from 310°C to 160°C. Using the natural gas combustion efficiency tables in your workbook, find the energy savings from the economizer as a percentage of historical fuel consumption.
- A. 7.1%
- B. 5.8%
- C. 3.1%
- D. 9.3%
- E. 1.2%
Answer: B
NEW QUESTION # 22
Which is the best application for variable-speed drives?
- A. Waste-water sewer lift pump
- B. Reciprocating air compressor
- C. Centrifugal fan motor in a variable-air volume air-conditioning system
- D. Centrifugal fan motor in a multi-zone air conditioning system
Answer: C
NEW QUESTION # 23
What is the uniform series present worth factor (P/A, i%, n) for an annual interest rate of 15% and a lifetime of 20 years?
- A. 6.259
- B. 4.676
- C. 0.214
- D. 0.160
Answer: A
NEW QUESTION # 24
Which of the following best describes a dead band in controls?
- A. A range around a set point with no change in state even though there is a change in sensor input
- B. A value that has been assigned to a controlled variable
- C. A system which changes the output of a controller based on how fast a variable is moving from or to a set point
- D. The delay in response of a system to a controlled change
- E. The difference between a sensor variable and its set point
Answer: A
NEW QUESTION # 25
How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)
- A. 840 kJ
- B. 420 kJ
- C. 630 kJ
- D. 510 kJ
Answer: A
NEW QUESTION # 26
Which of the following is NOT a typical benefit of performance contracting from the building owner's perspective?
- A. Performance contracting is a simple and quick process
- B. Performance contracting can provide access to external financing when the owner may not have sufficient equity for in-house financing for large projects
- C. Net cash flow can be neutral or positive for the owner
- D. Maintenance services provided by the performance contractor can add value to the overall savings achieved
- E. The energy-service company can have a financial incentive to achieve projected savings
Answer: A
NEW QUESTION # 27
If the temperature difference across an external wall is 20°C and the heat flow across the wall is 2.5 Watts/m², calculate the insulation value of the wall (including inside and outside air films)?
- A. R = 4 m²-°C/W
- B. R = 6 m²-°C/W
- C. R = 10 m²-°C/W
- D. R = 12 m²-°C/W
- E. R = 8 m²-°C/W
Answer: E
NEW QUESTION # 28
What is a common cause of poor power quality?
- A. Synchronous motors
- B. Natural gas turbine power generation by utilities
- C. Incandescent lighting
- D. Electronic equipment, such as personal computers
- E. Partially loaded induction motors
Answer: D
NEW QUESTION # 29
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 evaporator coil, before the compressor
- D. After the compressor, before the condenser coil
Answer: D
NEW QUESTION # 30
What is the definition of lamp life for a fluorescent lamp?
- A. The time at which lumen output has reduced by 50%
- B. The time at which lumen output has reduced to 70% of the initial light output
- C. The time at which lamps begin to fail
- D. The time at which 70% of a large sample of lamps have failed
- E. The time at which 50% of a large sample of lamps have failed
Answer: B
NEW QUESTION # 31
An air-conditioning system at full load is rated at 70-kW (thermal cooling) and has a coefficient of performance (COP) of 4.1. What is the electrical load at full load?
- A. 70.0 kW
- B. 46.7 kW
- C. 17.1 kW
- D. 35.0 kW
- E. 23.3 kW
Answer: E
NEW QUESTION # 32
Using the natural gas combustion efficiency tables in your workbook, find the combustion efficiency (based on higher-heating value) of a natural-gas-fired boiler if the excess air level is measured at 31.9% and the stack temperature rise is 187.8°C.
- A. 84%
- B. 80%
- C. 78%
- D. 76%
- E. 82%
Answer: E
NEW QUESTION # 33
Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?
- A. This cycle is not a combined heat and power system
- B. Combined cycle
- C. Bottoming cycle
- D. Topping cycle
Answer: C
NEW QUESTION # 34
When comparing two similar facilities, you see that the facility with newer, higher-efficiency equipment has a higher energy-use index [EUI] (kJ/m²-yr). What might be the cause?
- A. The facility with the lower EUI is in need of commissioning
- B. The facility with the higher EUI requires a supervisory control and data acquisition (SCADA) system
- C. The facility with the higher efficiency equipment should have a higher EUI
- D. The facility with the higher EUI is in need of commissioning
- E. The facility with the lower EUI requires a performance contract
Answer: D
NEW QUESTION # 35
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