Chemical Engineering - Chemical Engineering Basics

16. 

Steels with high carbon equivalent have poor weldability, because in these steels during welding

A. carbon and other alloying elements get oxidised from the weld pool.
B. excessive ferrite forms in the heat affected zone leading to poor toughness of the weld.
C. martensite forms in the heat affected zone leading to poor toughness/ductility of the weld.
D. segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld.

Answer: Option C

Explanation:

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17. 

If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?

A. 7
B. < 7
C. > 7
D. 0

Answer: Option C

Explanation:

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18. 

Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.

A. Vicker's
B. Rockwell
C. Knoop
D. Brinell

Answer: Option B

Explanation:

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19. 

Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

A. disposing off a machine/property on as is where is basis.
B. disposing off machine/property, which is no longer useful in the present scenerio.
C. mortgaging the obsolete machine/property.
D. writing off the obsolete machine/ property.

Answer: Option B

Explanation:

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20. 

Super conduction in metals is observed at a temperature of __________ °K.

A. <100
B. >100
C. about 273
D. about 373

Answer: Option B

Explanation:

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