Ventilation and Air Conditioning - Building Services - Architecture and Planning Previous Year Questions

1

2008 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2008

Function of Air Handling Unit in a building is to

A

purify and re-circulate the cool air.

B

supply purified bulk of air from outside to the window air-conditioner.

C

collect the stale air from the room and throw it outside the building.

D

act as a container in which air is carried from one place to the other.

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2

2008 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2008

Recommended temperature and fresh air flow for HVAC systems in office buildings in India are

A

21°C with maximum of 30°C in summer and 25°C in winter, with fresh air provisions of 18-22 litres per second per person.

B

29°C with maximum of 32°C in summer and 36°C in winter, with fresh air provisions of 28-32 litres per second per person.

C

30°C with maximum of 36°C in summer and 32°C in winter, with fresh air provisions of 38-42 litres per second per person.

D

21°C with maximum of 24°C in summer and 22°C in winter, with fresh air provisions of 8-12 litres per second per person.

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3

2008 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2008

Stack effect is

A

the process of supplying fresh air by electro-mechanical means both vertically and horizontally.

B

the tendency of hot air in a shaft to rise and create a draft of cool air intake.

C

the air-supply to a motor-driven louvered opening in basement.

D

the circulation of fresh air through windows from the plenum level.

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4

2008 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2008

If a bedroom of 3m x 3m x 3m requires 3 air-changes per hour, and difference in temperature between inside and outside (ΔT) = 12 deg C, then Ventilation Heat Flow Rate (Qv) will be:

A

0.12 kW

B

0.35 kW

C

0.70 kW

D

1.17 kW

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5

2008 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2008

For a given air velocity of 2m/s, the necessary cross-sectional area of supply-duct will be:

A

0.0375 sq.m.

B

0.0225 sq.m.

C

0.0113 sq.m.

D

0.0037 sq.m.

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6

2009 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2009

The parameter that does NOT appear in a Psychrometric Chart is

A

Wind speed

B

Dry bulb temperature

C

Wet bulb temperature

D

Relative humidity

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7

2009 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2009

A microwave oven of 3 kW rating is operated for 30 minutes, a hot water geyser of 1 kW rating is operated for 15 minutes, and 5 fluorescent lamps of 60 W are operated for 6 hours. The total power consumed (in kWh) will be

A

1.80

B

3.55

C

18.01

D

35.50

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8

2009 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2009

If 20 lit/sec/person of air is extracted from the office, calculate the ventilation rate in terms of air changes/hour.

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9

2013 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2013

Star Rating of an Air Conditioner is determined by its

A

Power Consumption

B

Energy Efficiency Ratio

C

Cooling Capacity

D

Power of Compressor

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10

2013 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2013

If the area coverage of one sprinkler is 20 m², with a maximum and minimum spacing of 4.6 m and 1.8 m respectively, the minimum number of sprinklers required to be arranged in a regular orthogonal grid to cover the area of a 15 m x 20 m room would be ______.

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11

2014 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2014

In a dance hall the indoor and outdoor temperatures are 28°C and 18°C respectively. There is an internal heat gain of 5 kW and the specific heat of air (on volume basis) is 1300 J/m³ °C, then the necessary cross sectional area (m²) of a duct with an air velocity of 2 m/s required for cooling by ventilation is __________

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12

2016 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2016

A room is mechanically ventilated through four air-conditioning ducts. The opening area of each duct is 0.35 sqm. The air velocity in the duct is 0.5 m/s. The temperature difference between the ambient air and supply air is 10 °C. Volumetric specific heat of air is 1250 J/m³°C. Assuming one Ton of refrigeration (TR) equals 3.5 kW, the cooling load of the room in TR will be ____________________

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13

2016 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2016

In a 20 storey building with 3m floor to floor height, a passenger lift is hoisted by a steel rope. Weight of the lift car is 750 kg and ultimate load the steel rope can carry is 39,000 kg. Assuming a factor of safety of 20 for the steel rope and an average passenger weight of 75 kg, the passenger capacity of the lift is ____________________

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14

2017 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2017

A room measures 3 m (width) × 4 m (length) × 3 m (height). The outdoor temperature is 36 °C. The volumetric specific heat of air is 1300 J/cu.m.°C. The ventilation heat flow rate in Watts required to attain an internal room temperature of 26 °C with 3 air changes per hour is __________

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15

2018 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2018

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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16

2018 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2018

A Single Phase Neutral (SPN) electrical circuit has a power consumption of 330W. Considering a voltage of 110V and power factor of 0.8, the electrical current drawn is __________ Amp (up to one decimal place).

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17

2019 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2019

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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18

2019 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2019

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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19

2019 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2019

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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20

2022 · Architecture and Planning · Building Services · Ventilation and Air Conditioning

Architecture and Planning (AR) 2022

In an ideal air-conditioning cycle shown below, which of the following statement(s) is/are true in the segments P, Q, R, S?

A

P: Vapour at low pressure

B

Q: Vapour at low pressure

C

R: Liquid at high pressure

D

S: Liquid-Vapour mixture at low pressure

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