CHEMICAL ENGINEERING BASICS QUIZ

Maraging steels derive their strength from the following mechanism:

Fine dispersions of alloy carbides in a ferrite matrix

Fine dispersions of intermetallics of Fe, Ni, Ti etc

A fine, highly dislocated and strong martensite

Fine dispersions of Fe₃ C nucleated on dislocations in austenite

TRUE ANSWER : ?
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Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature.

Decreases

Shows inversion of solubility

None of these

Increases

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Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.

Diaphragm

Axial flow

Reciprocating

Electromagnetic

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Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.

Elastic limit

Maximum point

Proportional limit

Yield strength

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Friction factor for fluid flow in pipe does not depend upon the

Fluid density & viscosity

Mass flow rate of fluid

Pipe length

Pipe roughness

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__________ iron is produced by the annealing of white cast iron.

Grey

Malleable

Ductile

Nodular

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Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

Mandrels, twist drills, small lathe tools and razors

Small punches, broaches reamers and springs

Forgings like can shaft, structural steel plate, threading dies and drawing dies

Cutlery, screws, rivets and files

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What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

Scale formation rate on economiser tubes increases

Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases

It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water

Economiser tube life increases due to handling of low temperature water

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__________ of air does not increase with increase in temperature.

Density

Thermal conductivity

Viscosity

Thermal diffusivity

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Rain drops falling through atmospheric air attain limited terminal velocity, because of

Force of gravity

Upward thrust due to air

Viscous force exerted by air

Surface tension effects of water

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YOUR ANSWER : ?

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