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Question 23/61
A desk lamp is located inside a windowless office. The office is heated during the winter and cooled during the summer. When the lamp is switched on, how much of the energy consumed by the lamp becomes heat in the office space?
Correct Answer: C
* All electrical energy consumed by the lamp is converted into heatwithin the space, either as direct heat or as waste heat from the light source.
* In a windowless office, no energy escapes as light.The light energy that is emitted eventually turns into heat through absorption by surfaces.
Thus, the correct answer isC. 100%.
* In a windowless office, no energy escapes as light.The light energy that is emitted eventually turns into heat through absorption by surfaces.
Thus, the correct answer isC. 100%.
- Question List (61q)
- Question 1: When should commissioning be included in the design and cons...
- Question 2: Which problems can be caused by poor power quality?...
- Question 3: Using the lumen method, calculate the number of luminaires (...
- Question 4: Which is the best application for variable-speed drives?...
- Question 5: What term describes the difference between the control signa...
- Question 6: Which of the following International Performance Measurement...
- Question 7: A cooling tower is delivering water to a chilled-water plant...
- Question 8: How does an enthalpy-based economizer control operate?...
- Question 9: Which motor parameter is the most difficult to measure with ...
- Question 10: A concentrating solar thermal system collects 5 GJ/h of ther...
- Question 11: Using an interest rate of 15%, an energy project has a net-p...
- Question 12: A 50-Hz alternating current (AC) induction motor has 3 pole ...
- Question 13: Which of the following statements best describe Demand Contr...
- Question 14: Infiltration (inward air leakage) in a building is dependent...
- Question 15: A facility replaces a natural gas heating system rated at 10...
- Question 16: A refrigerant-to-water heat exchanger can be added to air-co...
- Question 17: A steam trap with a 6-mm orifice in an 0.8-MPa steam system ...
- Question 18: Electricity costs SO. 10 per kWh. if an electric water heate...
- Question 19: What is a common method to reduce the impact of voltage imba...
- Question 20: The International Performance Measurement and Verification P...
- Question 21: Which of the following steam turbines will likely not provid...
- Question 22: A cooling tower delivers 29°C water to a central chilled wat...
- Question 23: A desk lamp is located inside a windowless office. The offic...
- Question 24: What is the purpose of monitoring energy consumption? SELECT...
- Question 25: A new energy-efficient boiler costs $60,890 to buy and insta...
- Question 26: Which of the following is a closed-loop controller?...
- Question 27: A compressed air system has a total volume of 247,500 liters...
- Question 28: Periodic commissioning of a building automation system (BAS)...
- Question 29: A 7 bar (gauge pressure) compressed air system has 5 leaks t...
- Question 30: Which of the following color temperatures looks more like da...
- Question 31: How can you tell if steam traps in a steam distribution syst...
- Question 32: If the initial design process includes group relamping, how ...
- Question 33: Which type of lighting control technique operates in "manual...
- Question 34: What is a common cause of poor power quality?...
- Question 35: In a warehouse, lights are mounted 4 meters above the floor....
- Question 36: Exhaust gases from an industrial furnace flow through a heat...
- Question 37: What is the Energy Use index (EUl) for a 4,000 m2 building t...
- Question 38: Which of the following statements best describe Demand Contr...
- Question 39: Which heat recovery device listed below can be used to prehe...
- Question 40: A motor operates with a normal and constant load. The electr...
- Question 41: What does a manometer measure?
- Question 42: Lighting systems operate with a certain recoverable light lo...
- Question 43: Which of the following statements regarding refrigerants is ...
- Question 44: Air is heated from 10°C (dry bulb temperature) and 80% relat...
- Question 45: In a chilled water thermal energy storage system, chilled wa...
- Question 46: Natural gas costs $4.80/GJ. How much does it cost to heat 50...
- Question 47: A compressed-air distribution system has one section that fr...
- Question 48: Why do electric utility companies transmit power at high vol...
- Question 49: An energy-saving project costs $540,000. The project will ha...
- Question 50: Using the natural gas combustion efficiency tables in your w...
- Question 51: What instrument is NOT used to measure temperature?...
- Question 52: A controller has a signal output that can range from 4 to 20...
- Question 53: A gas-fired boiler is operating with 31.9% excess air. A fee...
- Question 54: If a boiler cycles on and off too frequently, what control c...
- Question 55: Which electric rate tariff would best cost justify a thermal...
- Question 56: What instrument determines flow rate by measuring pressure d...
- Question 57: Which of the following controls can optimize the operation o...
- Question 58: A 1OO-kW packaged engine-generate combined heat and power (C...
- Question 59: A facility owner is considering installing a new chiller. Th...
- Question 60: A 100-kW electrical load has a power factor of 75%. What cap...
- Question 61: An air-conditioning system at full load is rated at 70-kW (t...
