Chemical Engineering - Chemical Engineering Basics

26. 

Pick out the wrong statement.

A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region.
B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation.
C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections.
D. Brittle materials are generally tested in tension.

Answer: Option B

Explanation:

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27. 

More than 95% of __________ is present in corrundum.

A. SiO2
B. A12O3
C. CaSiO2
D. MgO

Answer: Option B

Explanation:

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28. 

Blow off cock is provided in steam boiler to

A. guard the boiler in case of abnormal rise in steam pressure.
B. drain out water and sludge during its repair.
C. regulate the supply of water in boiler.
D. put out the fire in the furnace when the water level in the boiler falls to unsafe limit.

Answer: Option B

Explanation:

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29. 

Work hardening of a material

A. decreases its tensile strength.
B. decreases its ductility.
C. increases its ductility.
D. does not affect its ductility.

Answer: Option B

Explanation:

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30. 

Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium

A. nitrate
B. sulphate
C. carbonate
D. chloride

Answer: Option A

Explanation:

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