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NEW QUESTION # 69
Which type of lighting control technique operates in "manual on" and "auto-off mode, and can be used in situations where there is brief occupancy that do not need lights on?
- A. Vacancy sensor
- B. PIR/Microphonics dual technology
- C. Photocell control
- D. Occupancy sensor
- E. Microphonics technology
Answer: A
NEW QUESTION # 70
A building has a 100 m² wall with an R-value of 14.4 (m²-C/W) in a climate with 3,500 heating degree days (HDD). The building heater is 85% efficient [based on the fuel's higher-heating value (HHV)]. The fuel cost is $5.00/GJ [based on the fuel's higher-heating value (HHV)]. What is the annual cost of the heat loss through the wall?
- A. $14.44/yr
- B. $22.56/yr
- C. $16.22/yr
- D. $12.35/yr
- E. $10.56/yr
Answer: A
NEW QUESTION # 71
In a performance contract, which group has the greatest investment risk?
- A. The company installing the energy project
- B. The energy-service company
- C. Risk is shared by the terms in the performance contract
- D. The equipment manufacturer
Answer: B
NEW QUESTION # 72
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. 58%
- C. 88%
- D. 62%
Answer: A
NEW QUESTION # 73
Which of the following instruments is most useful for tracking long-term boiler performance?
- A. The exhaust stack temperature sensor
- B. The drum water level gauge
- C. The boiler room ambient temperature sensor
- D. The pressure gauge
- E. The feedwater temperature sensor
Answer: A
NEW QUESTION # 74
Air is heated from 10°C (dry bulb temperature) and 80% relative humidity to 32°C (dry bulb temperature).
What is the new relative humidity?
- A. 80%
- B. 20%
- C. 40%
- D. 60%
- E. 30%
Answer: B
NEW QUESTION # 75
What is the best type of heat exchanger to recover and transfer latent heat energy from one air stream to another?
- A. Desiccant heat wheel
- B. Run-around system
- C. Heat pipe
- D. Ceramic recuperator
- E. Shell and tube
Answer: A
NEW QUESTION # 76
A facility replaces a natural gas heating system rated at 10,000 kJ/h and 80% efficiency with an electric heat pump rated at 10,000 kJ/h and a coefficient of performance (COP) of 2.3. Will this project also reduce the annual energy utilization index (EUI) for the facility?
- A. No
- B. Yes
Answer: B
Explanation:
The Energy Utilization Index (EUI) is measured astotal energy consumption per unit area.
Step 1: Compare Energy Inputs for Both Systems
* Existing Natural Gas System:
* Heating output:10,000 kJ/h
* Efficiency:80%
* Required input energy
A screenshot of a math test AI-generated content may be incorrect.
NEW QUESTION # 77
What type of heat transfer is reduced by adding insulation to the inside surface of a wall?
- A. Convection
- B. Radiation
- C. Conduction
Answer: C
NEW QUESTION # 78
Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER
- A. R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact
- B. R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact
- C. R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications
- D. R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential
- E. R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential
Answer: A
Explanation:
Understanding the environmental impacts of various refrigerants is crucial for energy managers. Let's analyze each statement:en.wikipedia.org A:R-407C is a blended Hydro Fluoro Carbon or near Azeotropic mixture, and can be used as a replacement for R-22 in commercial applications:This statement is correct. R-407C is a blend of HFCs designed to replace R-22 in air conditioning systems.
B:R-11 and R-12 are Chloro Fluoro Carbons with significant ozone depleting potential:This is correct. R-
11 and R-12 are CFCs known for their high ozone depletion potential.
C:R-1234yf is a Hydro Fluoro Olefin with zero ozone depleting potential, and little global warming potential:Correct. R-1234yf is an HFO with negligible ozone depletion and low global warming potential.
D:R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact:This statement is incorrect.R-22 is a Hydrochlorofluorocarbon (HCFC), not a Hydro Chloro Carbon.While it does have ozone-depleting potential, its global warming potential is considered moderate, not significant.
E:R-32 and R-134a are Hydro Fluoro Carbons with zero ozone depleting potential, and significant global warming impact:This is correct. Both R-32 and R-134a are HFCs with no ozone depletion potential but have considerable global warming potential.
Conclusion:
The incorrect statement is D. R-22 is a Hydro Chloro Carbon with significant ozone depleting potential and significant global warming impact. Therefore, the correct answer is D.
NEW QUESTION # 79
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. Bottoming cycle
- C. Combined cycle
- D. Topping cycle
Answer: B
NEW QUESTION # 80
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. Compressor B
- B. Both air compressors have the same life-cycle cost
- C. Compressor A
Answer: A
NEW QUESTION # 81
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. 0.160
- B. 0.214
- C. 4.676
- D. 6.259
Answer: D
NEW QUESTION # 82
A 1OO-kW packaged engine-generate combined heat and power (CHP) system has the specifications listed below. The CHP equipment operates fully loaded for 8.000 h/yr. What isthe annual fuel cost for the ChP equipment?
CMP equipment specifications: Electrical output 100kw Electrical efficiency: 25% Thermal recovery efficiency: 50*6 Total CMP efficiency: 75% Additional information: Fuel cost: S3.S0/GJ Electricity cost S0.06/kWh Previous water heating efficiency:
8046 Mot water usage: 75,700 liters/day (21 *C temperature rise)
[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]
- A. $32,668/yr
- B. $52,222/yr
- C. $58,300/yr
- D. $43,776/yr
- E. $28,900/yr
Answer: D
NEW QUESTION # 83
A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?
- A. 6%
- B. 100%
- C. 66%
- D. 15%
- E. 25%
Answer: E
NEW QUESTION # 84
A 100-kW electrical load has a power factor of 75%. What capacitance, in KVAR, will improve the power factor to 95%?
- A. 25.3 kVAR
- B. 33.1 kVAR
- C. 15.7 kVAR
- D. 55.3 kVAR
- E. 45.2 kVAR
Answer: A
NEW QUESTION # 85
Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]
- A. $1.25
- B. $0.38
- C. $1.44
- D. $0.25
- E. $0.76
Answer: E
Explanation:
To calculate the cost of heating water using natural gas:
Step 1: Compute Energy Required to Heat the Water
Given:
* Mass of water= 500 L = 500 kg
* Temperature rise (#T)= 50°C - 18°C = 32°C
* Specific heat of water (Cp)= 4.2 kJ/kg-°C
Energy Required (Q)=m×Cp×#T
=500×4.2×32
=67,200 kJ=67.2 MJ
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NEW QUESTION # 86
In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux.
To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.
- A. 166 lux
- B. 276 lux
- C. 176 lux
- D. 150 lux
- E. 227 lux
Answer: C
NEW QUESTION # 87
If installed without ancillary equipment, photovoltaic power cells generate what type of power?
- A. Square-wave alternating current
- B. Direct current
- C. Sinusoidal alternating current
Answer: B
NEW QUESTION # 88
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