Highly porous refractory bricks are ____________________?

Related Mcqs:

1. Refractory bricks having high thermal conductivity is desirable, when it is to be used in the _________________?

   A. L.D. converter B. Blast furnace C. Rotary kiln D. Recuperator...

2. Refractory bricks burnt at very high temperature have got______________?

   A. Greater resistance to corrosion by slags B. Less resistance to corrosion by slags C. High spalling tendency D. None of these...

3. Resistance to fusion of the refractory under a steady rising temperature condition is called ____________________ ?

   A. Spalling B. Refractoriness C. Both A. & B. D. Neither A. nor B....

4. Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of_________________?

   A. Carbon B. Arsenic C. Lead D. Sulphur...

5. Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of ____________________?

   A. Nitric acid B. Sulphuric acid C. Ammonium sulphate D. Hydrochloric acid...

6. Polymethyl methacrylate (PMMA) is known as ____________________?

   A. Bakelite B. Teflon C. Perspex D. Nylon-6...

7. Enzymes are organic catalysts used in the ____________________ reactions ?

   A. Chemical B. Biochemical C. Photochemical D. Electrochemical...

8. A mineral is termed as ‘ore’, if ____________________?

   A. A metal can be economically extracted from it B. It contains ≥ 40% metal C. The metal present in it is costly D. All A , B. and C....

9. ____________________ of rubber decreases after its vulcanisation?

   A. Resistance to the action of organic solvent B. Tackiness C. Maximum service temperature D. Tensile strength...

10. Zeolite is used in the ____________________ ?

    A. Water treatment B. Glass manufacture C. Hydrogenation of fatty oil as a catalyst D. Development of exposed photographic plate...