| 1. |
The purpose of the air-conditioning system of a building is to provide complete thermal comfort for its occupants. Therefore, we need to understand the thermal aspects of the human body in order to design an effective air-conditioning system. |
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True |
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False |
| 2. |
The set of extreme outdoor conditions under which a heating or cooling system must be able to maintain a building at the indoor design conditions is called the _______________ ? |
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Indoor design conditions |
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Outdoor design conditions |
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Desirable design conditions |
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None of the above |
| 3. |
From the below picture which of the following statements is true ?
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Light-colored buildings absorb most of the incident solar radiation whereas dark colored ones reflect most of it. |
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Dark-colored buildings absorb most of the incident solar radiation whereas light colored ones reflect most of it. |
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Dark-colored buildings and light colored absorb equally and reflect unequally. |
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Dark-colored buildings and light colored reflect equally and absorb unequally. |
| 4. |
The unit thermal resistance of a plane layer of thickness L and thermal conductivity k can be determined from the formula ________ ? |
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R = L/k |
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R = k/L |
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L = R/k |
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k = R/L |
| 5. |
Radiation heat transfer between the ceiling and the roof can be minimized by covering at least one side of the attic (the roof or the ceiling side) by a reflective material, called________ ?, such as aluminum foil or aluminum coated paper. |
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radiant barrier |
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cold barrier |
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hot barrier |
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metal barrier |
| 6. |
From the following figure, what is the formula for total resistance?
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Rtotal = 1/(Rinside + Rglass + Routside) |
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Rtotal = Rinside – Rglass + Routside |
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Rtotal = Rinside + Rglass + Routside |
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Rtotal = (Rinside + Rglass )/Routside |
| 7. |
What is the value of Stefan-Boltzmann constant ? |
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5.67 x 10-8 W/m2 K4 |
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10 x 10-8 W/m2 |
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1 |
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5.67 x 10-8 W/m2 |
| 8. |
Most older homes and some poorly constructed new ones have numerous cracks, holes, and openings through which cold outdoor air exchanges with the warm air inside a building in winter, and vice versa in summer. This uncontrolled entry of outside air into a building through unintentional openings is called ___________ ? |
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Irregulation |
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Infiltration |
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Circulation |
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Aeration |
| 9. |
Which of the following is used as a preventive method for infiltration? |
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Caulking |
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Weather forecasting |
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Circulating |
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All of the above |
| 10. |
From the following figure , the most appropriate deduction is ______________ ?
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The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost. Therefore, more money should be allocated for Heating and cooling costs . |
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The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost. Therefore, thermal comfort and thus productivity should not be risked to conserve energy. |
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The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost .Therefore reduce the salaries and increase the budget for Heating and cooling costs. |
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The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost. Therefore, thermal comfort and thus productivity should be risked to conserve energy. |
| 11. |
Which of the following method uses a steady state approach while estimating the annual energy consumption of a building? |
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Variable approach method |
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Degree-day or degree-hour method |
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Isolated method |
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Steady responsive method |
| 12. |
Which of the following is a dynamic method used to estimate the annual energy consumption of a building? |
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Variable speed method |
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Isolated method |
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Transfer function method |
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Degree-day or degree-hour method |
| 13. |
The average annual energy consumption is based on average usage situations under average weather conditions. |
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True |
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False |
| 14. |
Weather-stripping is a narrow piece of metal, vinyl, rubber, felt, or foam that seals the contact area between the fixed and movable sections of a joint. Weather-stripping method is used to prevent _____________ ? |
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Thermal comfort |
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Infiltration |
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Deterioration |
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All of the above. |
| 15. |
Clear glass is preferred for showrooms since it affords maximum visibility from outside, but bronze-, gray-, and green-colored glass are preferred in office buildings since they provide considerable privacy while reducing glare. |
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True |
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False |
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