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101.	In _______________ process, the fresh air is forced in the room and the vitiated air is allowed to leave the room by itself or is extracted by outlet fans.(a) Plenum(b) Air conditioning(c) Exhaust(d) SupplyThis question was posed to me by my college professor while I was bunking the class.The query is from Variations in Ventilation System with Climate in division Acoustics and Ventilation of Construction & Building Materials
Answer» Correct answer is (a) Plenum Best explanation: The Plenum process MAY be employed for downward ventilation or upward ventilation. In the former case, the INCOMING AIR is allowed to ENTER at the ceiling height and while mixing with the vitiated air during its download journey, it is taken out through outlets situated at floor level.

102.	The ________________ plays an important role in the comfort of persons affected by ventilation system.(a) Carbon monoxide(b) Purity of air(c) Volume of room(d) Health of occupantI have been asked this question during an internship interview.I need to ask this question from Types of Ventilation in division Acoustics and Ventilation of Construction & Building Materials
Answer» Correct option is (b) Purity of air To EXPLAIN I would say: The air should be free from odours, organic matter, inorganic DUST and unhealthy fumes of gases such as carbon monoxide, carbon dioxide and Sulphur Dioxide, etc. All the above impurities depend on the habits of occupants, VOLUME of a room, SOURCE of ventilating air, etc.

103.	The speed at which the sound wave travels or passed through any medium is termed as the ______________(a) Sound speed(b) Sound velocity(c) Sound intensity(d) FrequencyThe question was asked in an online quiz.My query is from Acoustic Design of Auditorium topic in division Acoustics and Ventilation of Construction & Building Materials
Answer» The correct CHOICE is (b) SOUND velocity To elaborate: Sound velocity depends on the NATURE and the temperature of the medium through which the sound Travels. The sound velocity is different for different MEDIUMS.

104.	Which of the following constructions is effective against both air-borne and structure-borne sounds?(a) Timber floor floating construction(b) Use of resilient surface material(c) Timber floor with suspended ceiling and air space(d) Concrete floor floating constructionI have been asked this question during an interview for a job.This is a very interesting question from Acoustics topic in chapter Acoustics and Ventilation of Construction & Building Materials
Answer» RIGHT option is (c) Timber floor with suspended ceiling and AIR space For explanation: Timber floor with suspended ceiling and air space construction is effective against both air-borne and structure-borne sounds. The extent of improvement effected is DEPENDENT on the weight of the ceiling and on the structural RIGIDITY.

105.	_______________ defect is due to the lack of reflecting surfaces near the source of sound and excessive absorption of sound in the hall.(a) Exterior noise(b) Loudness(c) Interior noise(d) EchoesI have been asked this question in a national level competition.This key question is from Acoustics topic in section Acoustics and Ventilation of Construction & Building Materials
Answer» Correct OPTION is (b) LOUDNESS To explain I would say: The remedies to correct loudness defect consist in arranging hard reflecting surfaces near the SOURCE of sound and in adjusting the absorption of the hall so as to give an OPTIMUM time of reverberation. ALSO, the location of loudspeakers should be carefully adjusted.

106.	For working a temperature of 21 degree Celsius, range of 30% to 70% of ____________ is desirable.(a) Saturated air(b) Dry bulb temperature(c) Relative humidity(d) Wet bulb temperatureThis question was addressed to me in my homework.Query is from Types of Ventilation topic in chapter Acoustics and Ventilation of Construction & Building Materials
Answer» CORRECT answer is (C) Relative HUMIDITY For explanation I would say: The value of relative humidity is obtained by COMPARING dry BULB and wet bulb temperature. For higher temperatures, the low humidity and greater air movements are necessary for removing greater portion of heat from the body.

107.	The ____________ of suitable type may be used to distribute air inside the room.(a) Grills(b) Pumps(c) Ducts(d) CeilingsI got this question in an international level competition.This key question is from Variations in Ventilation System with Climate topic in division Acoustics and Ventilation of Construction & Building Materials
Answer» The correct choice is (b) Pumps For explanation I WOULD say: The selection of air conditioning pumps should be made while KEEPING in view its efficiency, capacity, available motive power, permissible noise level, etc. Whereas, the wall outlets maybe take various form such as diffuser, GRILLS, etc.

108.	The ________________ is defined as the number of pressure variation which asounding body makes in each unit of time.(a) Note(b) Pitch(c) Wavelength(d) IntensityThe question was posed to me during an interview for a job.This is a very interesting question from Acoustic Design of Auditorium topic in section Acoustics and Ventilation of Construction & Building Materials
Answer» The correct OPTION is (b) Pitch Explanation: The GREATER the number of variations, the higher will be the Pitch. The intensity of sound is defined as the flow of sound energy per UNIT of time through a unit AREA.

109.	______________ of sound is affected by frequency of sound.(a) Loudness(b) Intensity(c) Pitch(d) NoteThis question was posed to me in an international level competition.The question is from Acoustic Design of Auditorium topic in portion Acoustics and Ventilation of Construction & Building Materials
Answer» Right CHOICE is (B) Intensity For explanation I would say: The PHON indicates the level of sounds of equal loudness at all frequencies point for CONVENIENCE, The Phon and decibels differ so SLIGHTLY that they may be treated as synonyms.

110.	The absorption ratio of a surface is the ratio of ___________(a) Sound absorbed to reflected sound energy(b) Sound absorbed to incident sound energy(c) Reflected sound energy to incident sound energy(d) Incident sound energy to reflected sound energyI have been asked this question in class test.This intriguing question comes from Common Acoustical Defects topic in portion Acoustics and Ventilation of Construction & Building Materials
Answer» The correct answer is (b) Sound absorbed to incident sound energy The explanation is: The absorption ratio of a SURFACE is the ratio of sound absorbed to incident sound energy. The sound reducing the EFFECT of an ABSORBER is dependent on its area and on the efficiency of the material. It is indicated by the sound absorption COEFFICIENT.

111.	Which of the following is not a property of good acoustic materials?(a) They have a low coefficient of absorption(b) They are comparatively cheap(c) They are durable(d) They are efficient over a wide frequency rangeThis question was posed to me in an internship interview.I need to ask this question from Common Acoustical Defects in section Acoustics and Ventilation of Construction & Building Materials
Answer» Correct answer is (a) They have a LOW coefficient of ABSORPTION For EXPLANATION I would say: GOOD acoustic materials are comparatively cheap and DURABLE. They have a high coefficient of absorption and are efficient over a wide frequency range.

112.	In winter, it becomes necessary to supplied slightly _________ air to the inside of the building.(a) Cool(b) Heated(c) Humid(d) DehumidifiedI got this question by my college professor while I was bunking the class.This interesting question is from Variations in Ventilation System with Climate topic in chapter Acoustics and Ventilation of Construction & Building Materials
Answer» Correct option is (b) Heated The explanation: During winter, HEATING of AIR will also COMPENSATE for heat loss from the room. The preheating of incoming air may be CARRIED out by warm air furnaces or by coils around which hot water or steam is CIRCULATING. The incoming air is allowed to pass over warm air furnaces before it enters the room.

113.	In Winter, the outside air is cool and hence, the process of air conditioning involves filtering, preheating and _____________(a) Dehumidification(b) Humidification(c) Condensation(d) CirculationI got this question in an interview.This interesting question is from Variations in Ventilation System with Climate in chapter Acoustics and Ventilation of Construction & Building Materials
Answer» Right answer is (b) Humidification The EXPLANATION: The temperature of inside air will be HIGHER than that of outside air and it will be economical to RECIRCULATE a part of room air. In WINTER air conditioning the circulated air is passed through FILTERS and then it is preheated and humidified.

114.	Insulation of __________ over a base concrete floor is obtained by using resilient surface material on floors.(a) 1-5 dB(b) 5-10 dB(c) 12-15 dB(d) 17-25 dBThis question was posed to me in a national level competition.I would like to ask this question from Acoustics in section Acoustics and Ventilation of Construction & Building Materials
Answer» Right option is (b) 5-10 dB Explanation: An insulation of 5-10 dB over a BASE CONCRETE FLOOR is obtained by using RESILIENT SURFACE material on floors. It consists of providing soft floor finish over a thin concrete screed provided as the R.C.C. slab.

115.	In which of the following absorbents, absorption takes place due to the frictional losses occurring due to the to and fro movement of the air contained in the material caused by the sound waves?(a) Cavity resonators(b) Resonant panels(c) Porous materials(d) Composite typesI have been asked this question during an interview.Question is from Acoustics topic in chapter Acoustics and Ventilation of Construction & Building Materials
Answer» The correct answer is (c) Porous materials The explanation is: In porous materials, absorption takes place DUE to the frictional LOSSES occurring due to the to and fro movement of the air contained in the material caused by the SOUND WAVES. These materials absorb sound generally in higher FREQUENCIES.

116.	The unit of absorption is ____________(a) Poise(b) Stoke(c) Siemens(d) SabinThe question was asked in an online interview.This intriguing question comes from Acoustics in portion Acoustics and Ventilation of Construction & Building Materials
Answer» CORRECT option is (d) Sabin Explanation: The unit of absorption is the open window unit which is known as a sabin. It is named after the SCIENTIST who ESTABLISHED this unit. The unit of SOUND absorbed by one square metre of a FULLY open window is m^2-sabin.

117.	Which of the following types of absorbents can absorb the sound of any frequency?(a) Resonant panels(b) Cavity resonators(c) Porous materials(d) Composite typesThis question was addressed to me during an online interview.The origin of the question is Acoustics topic in division Acoustics and Ventilation of Construction & Building Materials
Answer» Right choice is (B) CAVITY RESONATORS For explanation: Cavity resonators can absorb the sound of any frequency. Porous materials absorb sound at high frequencies while RESONANT panels absorb sound only at LOWER frequencies.

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