Chemical Engineering - Chemical Engineering Basics

26. 

Silicon percentage in the silicon steel used for electrical appliances/equipments is

A. 0.3-0.4
B. 12-14
C. 3-4
D. 20-25

Answer: Option C

Explanation:

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27. 

Which of the following is not a dielectric material ?

A. Cotton, silk and paper.
B. Asbestos, glass, porcelain and mica.
C. Rubber and polymeric resins.
D. All refractory materials.

Answer: Option C

Explanation:

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28. 

Magnetic permeability of iron is increased by its

A. decarburising.
B. alloying with cobalt.
C. purification.
D. alternate heating & cooling.

Answer: Option B

Explanation:

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29. 

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

A. rigid
B. tough
C. ductile
D. plastic

Answer: Option C

Explanation:

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30. 

Material of construction of foundary crucible is

A. lead
B. stainless steel
C. graphite
D. cast iron

Answer: Option C

Explanation:

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