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Chemical Engineering Basics

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

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

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Chemical Engineering Basics
Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

Hot rolling
Casting
Cold rolling
Forging

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Chemical Engineering Basics
Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature.

Decreases
Increases
None of these
Shows inversion of solubility

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Chemical Engineering Basics
Which of the following is not used as a fuel in rocket propellaht ?

Liquid hydrogen
Liquid hydrazine
Kerosene oil
Liquid oxygen

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Chemical Engineering Basics
Nitrogen is not an essential component of

Protein
Any of these
Urea
Oils & fats

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Chemical Engineering Basics
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about

0.95902777777778
0.37569444444444
1.2090277777778
0.70902777777778

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