Thermal diffusivity of a wall is influenced by the choice of building material. Identify the statement(s) that is/are correct.
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- Thermal diffusivity is inversely proportional to thermal conductivity.
- Increase in specific heat capacity increases the thermal diffusivity.
- Materials with low thermal diffusivity have a high amplitude dampening effect.
- Thermal diffusivity is inversely proportional to the density of material.
Top Questions on Thermal, visual and acoustic comfort in built environments
- The decay of sound in an enclosed lecture hall of volume 3500 $m^3$ is shown in the Figure below. The sound source is switched off at point P. Using the Reverberation Time $(RT_{60})$ obtained from the figure, the calculated total sound absorption of the hall, in Sabins, is _____ (rounded off to the nearest integer).
- GATE AR - 2024
- Building Services and Sustainability
- Thermal, visual and acoustic comfort in built environments
- Which of the following statements is/are true?
- GATE AR - 2024
- Building Services and Sustainability
- Thermal, visual and acoustic comfort in built environments
- Match the terms in Group I with their associated items in Group II. \[ \begin{array}{|c|c|} \hline Group I & Group II
\hline (P) \ \text{Scotopic vision} & (1) \ \text{Ability to see under low light condition using rod cells}
(Q) \ \text{Presbyopia} & (2) \ \text{Vision in bright light using cone cells}
(R) \ \text{Emmetropia} & (3) \ \text{Inability to focus on distant objects}
(S) \ \text{Photopic vision} & (4) \ \text{Ideal distance vision}
& (5) \ \text{Inability to focus on nearby objects}
\hline \end{array} \]- GATE AR - 2023
- Building Services and Sustainability
- Thermal, visual and acoustic comfort in built environments
- Match the instruments in Group I with the physical quantities they measure in Group II. \[ \begin{array}{|c|c|} \hline Group I & Group II
\hline (P) \ \text{Goniophotometer} & (1) \ \text{Electromagnetic Energy at Specific Wavelengths of Light}
(Q) \ \text{Pyrheliometer} & (2) \ \text{Luminous Flux of Directed Light Sources}
(R) \ \text{Spectrophotometer} & (3) \ \text{Direct Solar Irradiance}
(S) \ \text{Forward-Looking Infrared Camera} & (4) \ \text{Temperature}
& (5) \ \text{Global Solar Radiation}
\hline \end{array} \]- GATE AR - 2023
- Building Services and Sustainability
- Thermal, visual and acoustic comfort in built environments
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Questions Asked in GATE AR exam
A four-arm uncontrolled un-signaled urban intersection of both-way traffic is illustrated in the figure. Vehicles approaching the intersection from the directions A, B, C, and D can move to either left, right, or continue in straight direction. No U-turn is allowed. In the given situation, the maximum number of vehicular crossing conflict points for this intersection is _________ (answer in integer)
- GATE AR - 2025
- Traffic survey methods, Traffic flow Analysis
An individual chooses a transport mode for a particular trip based on three attributes i.e., cost of journey (X), In-vehicle travel time to reach destination (Y), and Out-of-vehicle time taken to access mode at respective stops (Z). The values for these attributes for three modes Rail, Bus and Para-transit are given in the table. If the general utility (U) equation is \( U = - 0.5 \times X - 0.3 \times Y - 0.4 \times Z \), using the Logit model, the estimated probability of choosing Bus is _________ (rounded off to two decimal places).
- GATE AR - 2025
- Transportation