a) 63% calcium and 37% carbon .

 b) 37% calcium and 63% carbon.

 c) 33% calcium and 67% carbon.

 d) 67%  calcium and 33% carbon.

2.Acetylene Gas chemical compound consisting of?

 a) 92.3% carbon and 7.7% hydrogen .

 b) 80.5% carbon and 19.5 % hydrogen

 c) 85.5% carbon and 14.5 % hydrogen

 c) 95.5% carbon and 4.5 % hydrogen

3.Acetylene is the product of chemical reaction between calcium carbide and ?

 a) Air 

b) Water 

c) Kerosene oil 

d) lubricating oil

 4. Acetylene can be dissolve In ?

  a) Water 

 b) Acetone 

c) calcium   

d) kerosene

  5. When calcium carbide react with water, which gas is produced?

  a)Hydrogen 

  b) Propane

 c) LPG  

 d) Acetylene

6.Explain the Calcium carbide properties and  uses ?

7. Explain the Acetylene gas properties ?

8. Explain the acetylene generating method

     ( low pressure Generator )

9. Explain the acetylene generating method ?

    ( medium pressure Generator )

10. Explain the hydraulic back pressure valve ?