Chemical Engineering Basics

Question: Magnetic permeability of iron is increased by its
[A].

decarburising.

[B].

alloying with cobalt.

[C].

purification.

[D].

alternate heating & cooling.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dislocations are __________ defects.
[A].

point

[B].

line

[C].

volume

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.
[A].

0.01 to 0.10

[B].

0.2 to 0.4

[C].

0.5 to 0.7

[D].

0.8 to 1.0

Answer: Option B

Explanation:

No answer description available for this question.

Question: Nickel and __________ are the alloying element added in steel to increase its toughness.
[A].

molybdenum

[B].

chromium

[C].

vanadium

[D].

silicon

Answer: Option D

Explanation:

No answer description available for this question.

Question: With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.
[A].

impact strength

[B].

percent elongation

[C].

hardness

[D].

both ‘b’ & ‘c’

Answer: Option A

Explanation:

No answer description available for this question.

Question: Change in volume of metals from absolute zero temperature to their melting points is
[A].

almost same for all metals.

[B].

different for different metals.

[C].

less for low melting point metals.

[D].

less for high melting point metals.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Hard magnetic materials have high
[A].

coercive force.

[B].

residual magnetic induction.

[C].

both ‘a’ & ‘b’.

[D].

neither ‘a’ nor ‘b’.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is
[A].

5CaO . 3 Al2O3

[B].

3CaO . Al2O3

[C].

3CaO . SiO2

[D].

2CaO . SiO2

Answer: Option A

Explanation:

No answer description available for this question.

Question: Non-ferrous alloys used for making cutting tools need not have high
[A].

abrasion resistance

[B].

toughness

[C].

red hardness

[D].

cutting speed

Answer: Option B

Explanation:

No answer description available for this question.

Question: All of the following alloying elements of steel increases hardness but sacrifice ductility, except
[A].

nickel

[B].

vanadium

[C].

molybdenum

[D].

chromium

Answer: Option A

Explanation:

No answer description available for this question.