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Chemical Engineering Basics

Chemical Engineering Basics
Grain hardness is measured by the __________ hardness testing method.

Knoop
Rockwell F
Shore sceleroscope
Vicker's

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Chemical Engineering Basics
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

Re-0.8, Re0.5
Re0.5, Re0.8
Re0.8, Re0.5
Re0.8, Re-0.5

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Chemical Engineering Basics
The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.

Circulating fluidised bed
Fluidised bed
Pulverised fuel
Travelling grate stoker firing

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Chemical Engineering Basics
For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

Maximum temperature is higher
Expansion & compression are isentropic
Heat rejection is lower
Combustion is at constant volume

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Chemical Engineering Basics
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is

Oxidised preferentially
Reduced preferentially
Lighter
Cheaper

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Chemical Engineering Basics
Coke is added in the blast furnace to

None of these
Remove sulphur & phosphorus from molten metal
Reduce & melt the iron ore
Increase the fluidity of slag

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