Question 4There is a proposal to construct a factory 80m West from a long residential road which runs fromNorth to South and has houses spaced at 15m apart along both sides of the road. The expected noiselevel which will be created by the factory is 125 dB at a frequency of 250HZ. The ground locally willprovide no substantial attenuation of the noise and no other barriers are proposed at this stage inthe planning. The existing local background noise level is 55 dBA.i)If the maximum SWL at any house must not exceed 60DBA, determine how many houseswill require sound insulation work. State clearly any assumptions you make in yourcalculation.A barrier is to be erected 20m from the factory and parallel to the road. Calculate thesound attenuation of this barrier if no house will be subject to an SPL of greater thanii)60DBA.The possibility of constructing a second identical factory unit due South of the plannedone is also being considered. The above barrier can be assumed to be continued throughboth sites. Calculate how far this site should be from the first factory to ensure that theiii)noise level on the road equidistant from the two factories does not exceed 62dBA.

solution (A) sound pressure level (SPL) - 1. A sound strain is the tension deviation from…

ses spaced at 15m apart along both sides of the road. The expected noise by the factory is 125 dB at a frequency of 250OHZ. The ground locally will uation of the noise and no other barriers are proposed at this stage in cal background noise level is 55 dBA. SWL at any house must not exceed 60DBA, determine how many houses

ses spaced at 15m apart along both sides of the road. The expected noise by the factory is 125 dB at a frequency of 250OHZ. The ground locally will uation of the noise and no other barriers are proposed at this stage in cal background noise level is 55 dBA. SWL at any house must not exceed 60DBA, determine how many houses

Residential Construction Academy: House Wiring (MindTap Course List)

4th Edition

ISBN:9781285852225

Author:Gregory W Fletcher

Publisher:Gregory W Fletcher

Chapter14: Branch-circuit Installation

Section: Chapter Questions

Problem 11RQ

See similar textbooks

Similar questions

A pumping machine in the water lifting station is found to produce a sound level of 50 dB. During the upgradation plan one more such machine will be added. What will be the combined noise level? O 71-90 dB 41-50 dB 51-70 dB 91-110 dB
m the stack. Night, overcast H= 50 m A B JJJJVJ JM JJJi. J.. . hr. i. 1.2 km 1.4 km FIGURE P32 (a) At what distance will the maximum concentration of pollution occur? Which location (A or B) would have the higher level of pollution? (b) Suppose the sky clears up, and the windspeed stays less than 5 m/s. Will the location downwind at which the maximum concentration occurs move? If so, will it move closer to the stack or further away from the stack? (H remains 50 m.) (c) Under the new conditions in part b, which house would experience the most pollution?
The hourly average sound level for a community noise is 60 dBA from 7 A.M. to 7 P.M., 55 dBA from 7 P.M. to 10 P.M., and 50 dBA from 10 P.M. to 7 A.M. Find (a) Leg for the 24 hours, (b) Lân, and (c) CNEL.
A 5.75m high noise barrier is used to attenuate sound from a roadway adjacent to a residential subdivision. The height of the noise source is 1.25m and the height of the receiver is 2.25m. The distance from the noise source to the noise barrier is 22.00m. The distance from the noise barrier to the center of the rear yard of the residences is 11.00m. Determine the Path Length Difference in meters (accurate to 4 dec.pl.) that is created by the noise barrier.
Calculate the required fire flow and duration for a fire-resistive apartment building that has four floors, each with 4200m². The vertical openings are protected, and the entire building is equipped with automatic sprinklers. The neighborhood where this building is located has a large number of houses with wood shake roofs. Consider a side separation of 6m, and ignore the front and rear separation.
Engg.civil.
The sound level for a jet plane on the ground with sound pressure of 2000 u bar should be (a) 60 dB (c) 140 dB (b) 100 dB (d) 180 dB
2 T © t - Q1/Define flood routing. Explain its practical use. ||| = فلاتر 0 إضافة شرح... x mum
Problem No. 3 For the truss shown in Figure 3 calculate the force in each member using methods of joints indicate of the member is in compression or tension. A-G (A = 9 kN) H-N (A = 8.5 kN) 0-T (A = 10 kN) U-Z (A = 12 kN) %3D
Given the following differential level notes: STA BS HI FS ELEV BM-1 1.73 346 50 TP-1 2.50 185 TP-2 2.76 105 1.20 3.15 193 TP-3 BM-2 0.74 TP-4 1.67 0.98 TP-5 2.12 1.84 BM-3 1.77 What station has the highest elevation?
A Sm DL = 24 k/m LL : 18 kN/m 24x1.4 + 18X1.6 = 62.4 FNlm * Mow Can I get BM and SF For this case ? AS الم مسوحة ضوئیا کS2ne
شعبة ؟ * التاريخ الموضوع Home work Determine L that make BM at the center of 30KN/m 30KN/m 50KN 4 2m- min *2m 16 h 9 V W V