Which of the following is NOT a porous absorber?
A. Prefabricated tiles
B. Plasters and spray on materials
C. Acoustic blankets
D. Membrane absorber

1 Answer

Answer :

D. Membrane absorber

Related questions

Description : What absorber in which efficient absorption is only possible over a very narrow band approaching 1.0 (total absorption)? A. Porous material B. Helmholtz resonator C. Panel Absorber D. Membrane absorber

Last Answer : B. Helmholtz resonator

Description : A porous material is far more efficient at high than low frequency absorption. How to improve sound absorption at lower frequencies using this absorber? A. Increase the thickness B. Decrease the thickness C. Mount with and airspace behind D. Both A and C above

Last Answer : D. Both A and C above

Description : Noise from random acoustic or electric noise that has equal energy per cycle over a specified total frequency band. A. Gaussian noise B. Whiter noise C. Thermal noise D. All of the above

Last Answer : D. All of the above

Description : Which of the following determines the acoustic behavior of gases? A. Density B. Pressure C. Temperature D. All of the choices

Last Answer : D. All of the choices

Description : What is typical loudness level of an acoustic guitar 1 foot away? A. 60dB B. 100dB C. 80dB D. 40dB

Last Answer : C. 80dB

Description : Noise from random acoustic or electric noise that has equal per cycle over a specified total frequency band. A. Thermal noise B. White noise C. Gaussian noise D. All of these

Last Answer : D. All of these

Description : ECE Board Exam March 1996 A device to be connected across the headset in telephone receivers to reduce the effects of acoustic shock. A. Ground B. Two rectifiers in parallel with opposite polarities C. Protector D. Fuse

Last Answer : B. Two rectifiers in parallel with opposite polarities

Description : Have you heard the prefabricated steel structure building?

Last Answer : Our life? Are we married?

Description : How many years can a block of flats with normal modifications last? 300 years?

Last Answer : if there were no design and implementation errors, certainly 100, easily even 150 300 years will require major repairs, but technically and economically realistic it is

Description : If you have a requirement to buy a large commercially available prefabricated wash rack?

Last Answer : Need answer

Description : What prefabricated decks work well on a slope?

Last Answer : A Mechanical type prefabricated decks work well on a slope. For more information of the product, you can also visit this site http://www.deckhouse.com/.

Description : In India, are prefabricated components costlier than those of traditional cast-in-situ items that the prefabricated components replace? (A) Yes, because of heavier overheads and handling cost (B) Yes, ... of repetitive manufacture of a number of elements (D) No, because of savings in site labour

Last Answer : (C) No, because of repetitive manufacture of a number of elements

Description : Explain the procedure of the storage, transportation and erection of prefabricated building elements. 

Last Answer : Storage of pre-fabricated building elements: 1) Procurement storage of Unloading raw materials 2) Testing of raw materials 3) Design of concrete mix 4) Fabrication of reinforcement cages 5) ... differs with risk condition, hence skilled foremen, and workers to be employed on the job.

Description : What is the proper procedure for suppressing electrical noise in a mobile station? A. Apply shielding and filtering where necessary B. Insulate a all plain sheet metal surfaces from each other C. ... -static spray liberally to all nonmetallic D. Install filter capacitors in series with all dc wiring

Last Answer : A. Apply shielding and filtering where necessary

Description : What are the different materials used in making tiles?

Last Answer : Tiles can be made out of many things some of them are porcelain, terracotta, glass, ceramic, stone, marble, slate, saltillo, tarrazzo, and cement.

Description : Which of the following materials is sensitive to light? a. Photoresist b. Photosensitive c. Light Sensitive d. Maser

Last Answer : a. Photoresist

Description : The reverberation time of a 184.2 cubic meters broadcast studio is 0.84 sec. Find the absorption effect of the materials used in metric sabines. A. 35.3 B. 10.96 C. 379.8 D. 109.6

Last Answer : A. 35.3

Description : Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer. (A) Indirect tray (B) Spray (C) Freeze (D) None of these

Last Answer : (C) Freeze

Description : How often do you wash your sheets/blankets/pillowcases, really?

Last Answer : Not often enough

Description : How do you sleep in your blankets?

Last Answer : I sleep on my side, with the blanket up over my shoulder. There is sometimes someone in my bed, and I am a hethian thief who steals the blankets, but we just keep another blanket at the foot of the bed, so ... a bed. I have two beds that I sleep in regularly. But I prefer the bigger one. It's soft.

Description : How do you store your quilts and blankets long-term so they are not damaged by age?

Last Answer : answer:you could try lining your chest with acid-free paper. If you are storing fabrics long term, I would definately check on the fabric at least twice a year. Before putting it in the box make ... completely dry, and that you are keeping the box in a clean, cool, dry environment away from mice.

Description : Do you pile on blankets, or turn up the furnace?

Last Answer : Windows wide open, lots of blankets!!! Heat only goes on when I shower

Description : What's the best way to clean down and down alternative blankets?

Last Answer : What do the cleaning instructions on the duvet and blanket tags say to do? Also, do you use a duvet cover or just the duvet?

Description : What is your favorite position to sleep in? Do you like to sleep with blankets on or off?

Last Answer : On my back and no blanket..

Description : Are you familiar with the use of weighted blankets for calming and sensory issues?

Last Answer : Very good question. I can't answer this fully but I am definitely interested. I remember the feeling of being buried under sand at the beach. Your whole body pressure sensors are stimulated - and not the ... ll keep checking in here. May even do some more research on this. Thanks for the question :)

Description : What are your thoughts on Comfort Blankets?

Last Answer : I'm all about letting children have what soothes them. I don't see the danger in it at all. I sucked my fingers and always had a special pillow..I know many people who let their children have ... child developing, and I wouldn't discourage it or encourage it. I'd just let it take its course.

Description : Is it a law/regulation/code that all hotels have to triple sheet the beds? And, is it true that blankets only need to be washed every three months?

Last Answer : I worked in a professional laundry, and yes, the outer blankets only get a washing quarterly, unless they show reason to be washed before that.

Description : I don't have a lucky day today and I really need advice. I ordered 3 microfiber blankets in purple from the e-shop, but they supplied me with pink, which does not suit me. I have already written ... the closet and forget about them I'm unusually indecisive, please advise me what to do. Thank you :)

Last Answer : Owl, if Johnak decided, I would definitely return the blankets (cash on delivery) and look for the coveted purple ones. If it's a solid eShop, they should pay the postage, but they don't have to. But ... 'd love to help you so tangibly. The picture and dimensions would help. I will let you know. :)

Description : can disbetics use heated throws or blankets

Last Answer : Need Answer

Description : How are thermoses and blankets similar?

Last Answer : Feel Free to Answer

Description : How much money can I save if i install insulation blankets in my attic?

Last Answer : It can save you as much as $145 a year for every 1,200 square feet of ceiling area that is insulated. Savings which add up!

Description : How do down blankets hold up agaist moisture?

Last Answer : They hold up extremely well because the down naturally repels moisture. The blanket allows enough air to circulate through it, so you will stay dry even if you sweat a lot in your sleep.

Description : Are there any electric blankets safe for kids?

Last Answer : There are some companies who make electric blankets that are designed for children.

Description : Are most blankets today fire retardent?

Last Answer : Although most blankets are not fire retardant, they are widely available online and in stores.

Description : Compare Polartec and Royal Velvet electric blankets which brand will have product that can shut off automatically and have dual controls?

Last Answer : Royal Velvet electric blankets does have those controles and safety features and is a very good brand.

Description : What are the benefits of down blankets versus an electric heated blanket?

Last Answer : Down blankets will be very warm, but with an electric blanket you can control the level of warmth so you don't get too hot.

Description : Do any electric blankets have an automatic shut off feature?

Last Answer : Most electric blankets will shut off if start operating beyond a safe temperature.

Description : Are there affordable blankets to purchase for low income families?

Last Answer : Yes there are affordable blankets for low income families these blankets can be found on websites such as overstock.com, smartbargains.com/blankets, and www.bargainbunch.com/homeblankets.html

Description : Do electric blankets pose any risk to young children or are they safe?

Last Answer : A child doesn't need an electric blanket because they might not use it responsibly.They definitely shouldn't be used if bedwetting might be an issue..Older electric blankets were dangerous,but new models are safe if used appropriately.

Description : Is fleece blankets safe for babies?

Last Answer : There are fleece blankets that are made specifically for babies that are safe. You should be able to find them at Walmart, Target, and several places on line such as Ebay.com or Amazon.com

Description : Are bamboo blankets naturally antibacterial?

Last Answer : Yes, the bamboo fibers are natually antibacterial.

Description : What kind of blankets are safe for infants?

Last Answer : Infants should not be sleeping with blankets until at least 1 years old.

Description : Are blankets made of down alternative stuffing as warm as those made from down stuffing?

Last Answer : Synthetic down is actually just as warm as real down feathers, so you needen't worry.

Description : What type of blankets are best to use in the summer time?

Last Answer : The most common summertime blanket material is cotton. It is breathable, as well as comfortable. Some other materials that may be good for summer weather are silk, or even hemp.

Description : Are the Lebarca brand of organic wool blankets allergen free?

Last Answer : Lebarca organic wool blankets are not allergen free. They are 100% virgin wool blankets, which means the fabric is not unnaturally colored or touched by chemicals.

Description : What are throw blankets for?

Last Answer : Throw blankets are just a more portable blanket. They occupy little space, and are easy to take with you wherever u go!

Description : Which types of blankets are going to be warmest when sleeping in freezing temperatures?

Last Answer : There are so many types of blankets that can be used during the cold winter months that will actually keep a person from freezing. So I'll list at least 3 different kinds that you can choose ... thick material that will trap body heat inside and allow an individual to warm up rather quickly and s

Description : Does Home Depot sell affordable moving blankets?

Last Answer : Home Depot moving blankets seem to be priced reasonably, and sometimes Home Depot has coupons. If you are moving, usually you can rent moving blankets for an additional $20 from moving truck companies such as Penske and Budget.

Description : Movers Blankets ?

Last Answer : best auto transport in USA provides best car movers USA at affordable prices.A lot of Customers don't know the process of Shipping. We guides our customers on the whole shipping process with focus and ... help you in moving your cars, Suvs, Seddans, Cruise etc at affordable prices anywhere in USA.

Description : Are horse blankets just specifically for horses?

Last Answer : Horse blankets were made for horses, but like with everything else, you are able to use them for other things as well. Some people use them for picnics!