GATE AR topic:building-services-sustainability PYQs & Answers — Page 7

Questions 61–70 of 83. Imported answers require independent review unless marked reviewed.

Match the units provided in Column - I with their corresponding items in Column - II, and select the appropriate option.

Column - I	Column - II
P — dB	1 — Sound Intensity
Q — Phon	2 — Absorption of sound
R — W/m²	3 — Frequency of sound
S — Sabine	4 — Loudness
	5 — Sound pressure level

Your answerChoose one option.

P-5, Q-1, R-4, S-3

P-2, Q-3, R-4, S-5

P-1, Q-2, R-3, S-4

P-5, Q-4, R-1, S-2

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Match the items in Column - I and their respective location in building/site in Column - II and select the appropriate option.

Column - I	Column - II
P — Nahani Trap	1 — Between waste water pipe and main house drain
Q — Gully Trap	2 — Between septic tank and soak pit
R — Bottle Trap	3 — Junction of house drain and sewer
S — Intercepting Trap	4 — Bathroom and kitchen floor
	5 — Below the wash basin

Your answerChoose one option.

P-4, Q-5, R-2, S-3

P-5, Q-1, R-3, S-2

P-4, Q-1, R-5, S-3

P-3, Q-4, R-5, S-2

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The internal dimension of a room is 10m × 10m × 4m (height). The total area of the doors and windows are 16 m². Keeping the doors and windows closed, the reverberation time of the room becomes 1.2 second. Assume all the interior surfaces including doors and windows have same sound absorption coefficient. If all the doors and windows of the room are kept fully open, the reverberation time will be ________ second (rounded off to two decimal places).

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Solar panels are proposed to be installed on a building roof top to generate electricity. The size of each solar panel is 2 m². The efficiency of each panel is 75%. The orientations of the solar panel and related solar data are given in the table below.

Orientation | No. of Panel | Average daily solar radiation in W/m² | Average solar hours per day South | 10 | 400 | 4 West | 5 | 300 | 2

As per the above proposal ________ kWh solar power will be generated daily. (rounded off to one decimal place)

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A room having dimension 12 m × 10 m × 3.5 m is required to be mechanically ventilated by air-conditioner. The temperature difference between outdoor ambient air and the supply air is 12 °C. Consider three air exchanges per hour. The volumetric specific heat of the air is 1250 J/m³ °C. Assume one ton of refrigeration (TR) is equal to 3.5 kW. The capacity of the air-conditioner for the room in TR will be ________.

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The stack pressure is created by 10 m height of stack and 15°C temperature difference. The motive force due to the stack pressure over a cross section area of 2.5 m² is ______ N.

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Assuming other variables remaining constant, the Tropical Summer Index

Your answerChoose one option.

Increases with increase in air velocity

Decreases with increase in wet-bulb temperature

Decreases with increase in globe temperature

Increases with increase in vapour pressure

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The concentric circles in a solar chart represent

Your answerChoose one option.

Azimuth angle

Altitude angle

Horizontal shadow angle

Vertical shadow angle

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A room of 3m × 3m × 3m has a reverberation time of 0.8 sec. Using Sabine’s method, the total absorption in the room is ____________ sabin (up to one decimal place).

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A 25 storeyed building has 5 lifts. The resulting waiting time is 35 sec and ‘Return Travel Time’ is 175 sec. The number of lifts required for reducing waiting time to 25 sec, without increasing the lift speed, is ______________

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GATE AR topic:building-services-sustainability PYQs

Question 34

Question 36

Question 46

Question 48

Question 50

Question 53

Question 11

Question 23

Question 24

Question 25