CHEMICAL ENGINEERING

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.

Question: __________ can not increase the fatigue strength of a material.
[A].

Grain refining

[B].

Grain coarsening

[C].

Surface hardening

[D].

Shot peening

Answer: Option B

Explanation:

No answer description available for this question.

Question: On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.
[A].

ultimate tensile strength (UTS)

[B].

modulus of toughness

[C].

percent elongation

[D].

modulus of resilience

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young’s modulus, G = Modulus of rigidity or shear modulus v = Poisson’s ratio) ?
[A].

E = 2G (1 + v)

[B].

E = G (1 + v)

[C].

E = G (1 + v)/2

[D].

E = 2G (1 + 2v)

Answer: Option A

Explanation:

No answer description available for this question.

Question: Between 230 and 370°C, blue brittleness is caused in mild steel because of the
[A].

immobility of dislocation.

[B].

strain-ageing.

[C].

increase in Young’s modulus.

[D].

strain hardening.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
[A].

powder metallurgy

[B].

casting

[C].

forging

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fibre glass is a composite material of
[A].

glass fibre in a polymer matrix.

[B].

glass fibre in a metallic matrix.

[C].

polymer fibre in a glassy matrix.

[D].

both ‘b’ & ‘c’.

Answer: Option A

Explanation:

No answer description available for this question.