Chemical Engineering - Chemical Engineering Basics

11. 

Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 .

A. 0.5
B. 1
C. 2
D. 2.5

Answer: Option D

Explanation:

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12. 

Out of the following, the joint produced by __________ has the lowest strength.

A. soldering
B. welding
C. brazing
D. rivetting

Answer: Option A

Explanation:

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13. 

Dies for wire drawing are generally made of

A. mild steel
B. stainless steel
C. carbides
D. high carbon steel

Answer: Option A

Explanation:

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14. 

The starting of a car takes time in winter, because the

A. octane number of fuel is decreased.
B. fuel supply for ignition is not sufficient.
C. vaporisation of the fuel is decreased.
D. pour point of fuel decreases.

Answer: Option C

Explanation:

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15. 

The elastic strain in copper is due to the

A. motion of dislocations.
B. stretching of atomic bonds.
C. breakage of atomic bonds.
D. none of the above.

Answer: Option A

Explanation:

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