Chemical Engineering MCQs

Page No. 826

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is_____________________?


a5CaO. 3 Al2O3


b3CaO. Al2O3


c3CaO. SiO2


d2CaO. SiO2


View Answer 5CaO. 3 Al2O3

The pressure outside a bubble/droplet of liquid is ________________ the internal pressure?


aGreater than


bLess than


cEqual to


dUnpredictable; depends on the bubble size


View Answer Less than

______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ?


aCollar


bFlanged


cBell and Spigot


dExpansion


View Answer Flanged

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ?


aOutput & fineness


bVelocity


cBoth A. & B.


dNone of these


View Answer Both A. & B.

The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________?


a0.8


b1


c1.4


d1.8


View Answer 1.4

‘Cryogenics’ is concerned with the generation & use of low temperature in the range of____________________?


a0°K to 123°K


b0°C to – 123°C


c0°C to – 273°C


d0°K to 273°K


View Answer 0°K to 123°K

__________________ of air does not increase with increase in temperature?


aDensity


bThermal diffusivity


cViscosity


dThermal conductivity


View Answer Density

Minimum number of members required to form a Public Limited Joint Stock Com-pany is___________________?


a7


b10


c12


d17


View Answer 7

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _____________________?


aBase and strong acid


bBase and weak acid


cAcid and weak base


dNone of these


View Answer Base and strong acid

Carbon is present in the form of _______________________ in grey cast iron ?


aSpheroids


bNodular aggregates of graphite


cFlakes


dCementite


View Answer Flakes

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