Metallurgical Engineering · all questions

Miscellaneous in Metallurgy
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Q221

At what temperature material heated in reheating furnace before hot rolling?

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Q222

Match entities listed in Column I with their correct dimensions given in Column II.

Column I	Column II
P. Drag coefficient	1. ML^-1 T^-1
Q. Mass transfer coefficient	2. ML^-2 T^-1
R. Viscosity	3. M⁰ L⁰ T⁰
S. Mass flux	M⁰ LT^-1

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Q223

In hot forging

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Q224

For cold rolling

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Q225

Match the properties in Group I with the units in Group II.

Group I	Group II
P. Thermal conductivity	1. J.m^-2s^-1k^-1
Q. Heat transfer coefficient	2. J.m^-1s^-1k^-1
R. Specific heat	3. m.s^-1
S. Diffusivity	4. J.mol²s^-1

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Q226

For a polymer reinforced with 40 vol.% glass fiber, the elastic modulus (in GPa) along the transverse direction is
[E_{glass fiber} = 70 GPa; E_polymer = 6.5 GPa]

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Q227

Graphite fibres are used to make undirectional Al-matrix composites. Young's modulus of graphite and aluminium are 400 GPa respectively. If a composite contains 60 volume % of fiber and is loaded along the fiber direction, the Youngs Modulus of the composite is . . . . . . . . GPa.

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Q228

For most extrusion operations, the optimum semi die angle is between

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Q229

Work hardening of materials is due to

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Q230

The effect of viscosity on the fluidity of liquid is

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Q231

The relative contribution of molecular diffusion to overall mass transfer is highest in

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Q232

Chances of crack propagation are more in

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Q233

For plastic materials, the poisons ratio is

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Q234

An edge dislocation in an infinite body has

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Q235

The newtons law of cooling for convection heat transfer process?

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Q236

A steel ball (density ρsteel = 7200 kg/m³) is placed in an upward moving liquid AI (density ρal = 2360 kg/m³, viscosity μAl = 1 × 10^-3 Pa.s and Reynolds number = 5 × 10⁵). The force (F) exerted on the steel ball is expressed as F = fπR²(ρAl V²/2)
where, f is friction factor (= 0.2), v is the velocity of liquid AI and R is the radius of steel ball.
The force exerted on the steel ball is

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Q237

A large backup roller is surrounded by various numbers of planetary working rollers is called

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Q238

The polymer in which steric placements of the substituent are arranged in such a way to give alternate d and l configurations, is known as

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Q239

Composites are used in . . . . . . . . of boats.

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Q240

In MIG welding

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