Metallurgical Engineering · all questions

Miscellaneous in Metallurgy
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Q201

The temperature of a gas flowing in a long duct as measured by thermocouple (having an emissivity of 0.5) is 800 K. The internal wall surface of the duct is at a temperature of 500 K. The convective heat transfer coefficient between the gas and the tip of the thermocouple is 100 W^-1 . K .^-1 The actual gas temperature is actually . . . . . . . . K.

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Q202

Generalised Fick's law for a component i in a multicomponent solution can be written as

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Q203

In two high reversing mill, . . . . . . . . rolls are used.

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Q204

A fluid is flowing with a velocity of 0.5 m/s on a plate moving with a velocity of 0.01 m/s in the same direction. The velocity at the interface of the fluid and plate is

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Q205

A tensile specimen was deformed at a constant cross head speed of 6 mm/min. The strain rate at the start of the testing was 5 × 10^-3 s^-1. The initial gauge length of the specimen (in mm) was

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Q206

Hot metal at 1700 K is poured in a sand mould that is open at the top. Heat loss from the liquid metal takes place by

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Q207

A mass flow process by which atoms changes their position relative to their neighbor in a given phase under the influence of thermal energy and concentration gradient.

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Q208

The heating of eutectoid steel is done for hardening process in the range of temperature

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Q209

A glass reinforced polymer composite comprises of 35 volume % glass fiber and 65 volume % of polymer resin. The elastic moduli of glass and polymer resin are respectively 70 GPa and 3 GPa. The elastic modulus of the composite (in GPa) under iso-strain state is

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Q210

What are the best precautions for eye and arc rays?

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Q211

In electrical resistance welding pressure applied varies in the range

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Q212

When the more amount of acetylene than oxygen is mixed and burn at tip of the welding torch. The flame generated is called

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Q213

Bainite in iron-carbon alloys has a . . . . . . . . structure.

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Q214

It takes 10 hours to homogenize an alloy at 1273 K. The time required (in hours) to achieve the same extent of homogenization at 1373 K is . . . . . . . .
Given: Diffusivity, D₁₃₇₃ K = 10^-18 m² s^-1 and D₁₂₇₃ K = 10^-19 m² s^-1

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Q215

Typical examples of heat conduction through cylindrical tubes are not found in

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Q216

In mechanical working processes, lubricants don't . . . . . . . .

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Q217

The structure of Polymer . . . . . . . .

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Q218

The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it is defined as

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Q219

In resistance welding the pressure is released

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Q220

In the Frank-Read dislocation source, if the distance between fixed points is L, then the minimum possible value of dislocation loop radius will be equal to

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