Chemical Engineering - Chemical Engineering Basics

46. 

Lead is poured into the joint between two- __________ pipes.

A. mild steel
B. concrete
C. cast iron
D. asbestos cement

Answer: Option C

Explanation:

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47. 

The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6 )

A. 4.4
B. 5.6
C. 8.4
D. 2.4

Answer: Option A

Explanation:

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48. 

Age hardening is connected with

A. babbit metal
B. gun metal
C. stainless steel
D. duralumin

Answer: Option D

Explanation:

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49. 

With decrease in the grain size of a material, its creep resistance

A. increases.
B. decreases.
C. remains constant.
D. either (a) or (b) ; depends on the material.

Answer: Option C

Explanation:

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50. 

__________ rubber is generally used for making 'O' rings used for vacuum sealings.

A. Natural
B. Neoprene
C. Butadiene
D. Nitrile

Answer: Option B

Explanation:

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