1-2 trade name of the raw materials use in making fused aluminum oxides.

1-2 trade name of the raw materials used in making fused aluminum oxides.

3. Compose of impurities mainly iron and silicon oxides

a. Borazon

b. Norbide

c. Red bauxite

d. Artificial corundum

4. It is made by crystallizing through fusion pure alumina in a hydrogen-oxygen upside-down flame at 3500 Fahrenheit.

a.Borazon

b.Norbide

c.Red bauxite

d.artificial corundum

5. Boron carbide made its first appearance in

A. 1934

B.1943

C.1933

D.1944

6. Its hardness is comparable with diamond

a. Norbide

b. Artificial corundum

c. Boron nitride

d. Boron carbide

7. Boron carbide first came out under the name of

a. Sapphire

b. Norbide

c. Borazon

d. Corazon

8. The first factory for the production of calcium carbide was buit in

a. Nagara falls

b. Niagara falls

c. Naira falls

d. Niaga falls

9. He attempted to prepare metallic calcium from lime and tar in an electric furnace

a. B. C. Willson

b. G. C. Wilsonn

c. C. M. Wilsonn

d. T. L. Willson

10-11. Two principal procedures in utilizing calcium carbide

-manufacturing cyanide by combining it with nitrogen

-preparing acetylene by reacting it with water

12. it is made by heating calcium carbide in an atmosphere of nitrogen

a. Cyanide

b. Cyanamide

c. Calcium nitride

d. Norazon

13. The most widely used source of carbon, should be compact and have a low ash content, a low ignition point, and high electrical resistivity.

a. Anthracite

b. Petroleum coke

c. Coke

d. Charcoal

14. it s produced by burning limestone containing at least 07% calcium carbonate

a. Quicklime

b. Calcium carbide

c. Carbon based acetylene

d. Anthracite

15. When carbide is made into acetylene, this substance must be absent because it can form phosphide.

a. Phosphine

b. Phosphorus

c. Phospanes

d. Pyrophosphate

16. It is a furnace that is charged by an electric arc.

a. Electric arc furnace

b. Arc furnace

c. Induction arc furnace

d. Resistance arc furnace

17. The furnace described in number 16 has a temperature capacity of

a. 3000 degree Celsius

b. 1710 degree Celsius

c. 4100 degree Celsius

d. 1700 degree Celsius

18. Old-fashioned or combustion furnaces has a temperature capacity of

a. 3000 degree Celsius

b. 1710 degree Celsius

c. 4100 degree Celsius

d. 1700 degree Celsius

19. It is a furnace that is advantageous because it is clean, energy-efficient and well-controllable melting process

a. Electric furnace

b. Induction furnace

c. Induction arc furnace

d. Resistance arc furnace

20. It a furnace ran by induction

a. Electric furnace

b. Induction furnace

c. Induction arc furnace

d. Resistance arc furnace

21. Anelectricfurnaceinwhichtheheatisdevelopedbythepassageofcurrentthroughasuitableinternalresistancethatmaybethecharge itself, a resistor embedded in thecharge, oraresistorsurroundingthecharge.a. Electric resistance furnace

b. Induction furnace

c. Induction arc furnace

d. Resistance arc furnace

22-28 Enumerate the Naturally Occuring Abrasives

29-30 Enumerate atleast 2 Artificial Abrasives