Chemical Engineering MCQs

6108 MCQs (Page 11 of 611)

Attempt Chemical Engineering Quiz

The units of the rate constant for a second order reaction are__________________?

A. Sec-1. mole°
B. Moles1. sec-1
C. Moles-1. sec1
D. Moles1. sec1

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A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than _______________ percent ?

A. 150
B. 200
C. 300
D. 400

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The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?

A. 0
B. 100
C. 50
D. None of these

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Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to ________________ boiling ?

A. Film
B. Nucleate
C. Transition
D. All modes of

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Normalising does not ______________________ of a metal ?

A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working

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Material of construction of the electrode used in the electric resistance welding is___________________?

A. Stainless steel
B. Graphite
C. Copper
D. Steel

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Which of the following is an ore dressing operation ?

A. Classification
B. Smelting
C. Roasting
D. None of these

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Shampoos are commercially not available in the form of ___________________?

A. Powder
B. Gaseous mixture
C. Solution
D. Emulsion

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In multipass welds, shot peening is done after each pass to__________________?

A. Close the surface porosity
B. Break the continuity of columnar grains
C. Flatten the weldment
D. Introduce texture in the weld

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Pick out the correct combination about the role of various additives used in polymers ?

A. Plasticiser: increases the polymer strength
B. Heat stabiliser: increases the maximum service temperature
C. Fillers: does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers

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