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Consider the following statements: 1. Asphalt is a naturally occurring product having a non-crystalline structure. 2. Rock Asphalt occurs in limestones or sandstones. 3. Tar is the residue left after the distillation of crude oil. 4. Resins in Asphalt provide the stickiness to the product. Which of the above statements are correct?
In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint? 1. Copper slag 2. Cold mix asphalt technology 3. Geotextiles 4. Hot mix asphalt technology 5. Portland cement Select the correct answer using the code given below:
In the Union Budget 2011-12, a full exemption from the basic customs duty was extended to the bio-based asphalt (bioasphalt). What is the importance of this material? 1. Unlike traditional asphalt, Bioasphalt is not based on fossil fuels. 2. Bioasphalt can be made from non-renewable resources. 3. Bioasphalt can be made from organic waste materials. 4. It is eco-friendly to use Bioasphalt for surfacing of the roads. Which of the statements given above are correct?
A prime coat is low viscosity asphalt emulsion used to create bond between existing pavement and new asphalt overlay.
Asphalt mastic has sand and asphalt in the ratio ________
In asphalt mastic flooring ___________ should be added to the asphalt mix in order to apply it cold.
A company owns some land and buildings for which the following details are relevant : Cost of land Taka 50,000; cost of building Taka 100,000, estimated life of building 20 years, estimated residual value of building Taka 2000; estimated residual value of land Taka 50,000. The company uses the straight line depreciation method. Which is the correct annual depreciation charge for this asset?
Look at the chlorine residual data during chlorination of wastewater which consists of ammonia, organic matter, and microorganisms. Chlorine dosage (mg/L) 0.1 0.5 1.0 1.5 2.0 2.5 Chlorine residual (mg/L) 0.0 0.4 0.8 0.4 0.9 1.4 Calculate chlorine dose at the breakthrough point
The residual magnetism of a self excited DC generator is lost. To build up its emf what to be done to regain the residual magnetism?
In DC machines the residual magnetism is present. The order of residual magnetism is ___________