Question: Hard magnetic materials have high
[A].coercive force.
residual magnetic induction.
both ‘a’ & ‘b’.
neither ‘a’ nor ‘b’.
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.
CHEMICAL ENGINEERING
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
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
3CaO . Al2O3
3CaO . SiO2
2CaO . SiO2
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
Non-ferrous alloys used for making cutting tools need not have high
Question: Non-ferrous alloys used for making cutting tools need not have high
[A].abrasion resistance
toughness
red hardness
cutting speed
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
All of the following alloying elements of steel increases hardness but sacrifice ductility, except
Question: All of the following alloying elements of steel increases hardness but sacrifice ductility, except
[A].nickel
vanadium
molybdenum
chromium
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
__________ can not increase the fatigue strength of a material.
Question: __________ can not increase the fatigue strength of a material.
[A].Grain refining
Grain coarsening
Surface hardening
Shot peening
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.
Question: On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.
[A].ultimate tensile strength (UTS)
modulus of toughness
percent elongation
modulus of resilience
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this 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) ?
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)
E = G (1 + v)
E = G (1 + v)/2
E = 2G (1 + 2v)
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.
Between 230 and 370°C, blue brittleness is caused in mild steel because of the
Question: Between 230 and 370°C, blue brittleness is caused in mild steel because of the
[A].immobility of dislocation.
strain-ageing.
increase in Young’s modulus.
strain hardening.
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.
Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
Question: Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
[A].powder metallurgy
casting
forging
none of these
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.
Fibre glass is a composite material of
Question: Fibre glass is a composite material of
[A].glass fibre in a polymer matrix.
glass fibre in a metallic matrix.
polymer fibre in a glassy matrix.
both ‘b’ & ‘c’.
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
No answer description available for this question.