Chemical Engineering Basics - Chemical Engineering Questions and Answers

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The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

final control element.

on-off control.

floating control action.

none of these.

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Fahrenheit and Centigrade scales have the same readings at

-55°

-40°

-33°

-58°

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Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?

Wood's metal

Babbit metal

Monel metal

Duralumin

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Water-tube boiler is the one, in which

water passes through tubes and flue gases around it.

tube carrying hot flue gases are immersed in a pool of water.

tubes are placed in vertical position.

none of these.

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Dephosphorisation of molten pig iron is favoured by

oxidising and basic slag.

reducing and basic slag.

high activity co-efficient of phosphorous in metal.

oxidising and neutral slag.

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In a neutral solution

H⁺ ions are absent.

OH^- ions are absent.

both H⁺ and OH^- ions are present in very small but equal concentration.

none of these.

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Which of the following commonly used condenser tube materials has the lowest thermal conductivity?

Admirability brass.

Stainless steel.

Aluminium brass.

Titanium.

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Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

fracture

dislocation

slip

twinning

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A common disinfectant used in village wells for disinfection of water is

free chlorine

bromine

iodine

potassium permanganate