Chemical Engineering MCQs

Page No. 144

Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?


aSuperheated vapour


bPartially condensed vapour with quality of 0.9


c Saturated vapour


dPartially condensed vapour with quality of 0.1


View Answer Superheated vapour

Most of the common metals have ______________ crystal structure?


aCubic


bHexagonal


cOrthorhombic


dNone of these


View Answer Cubic

Ball bearings are normally made of _____________ steel?


aHigh speed


bHigh carbon


cChrome


dSilicon


View Answer Chrome

If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) ⇌ C3H8(g) will be _____________ Kcal?


a -19.4


b -30.2


c 55.2


d -55.2


View Answer -19.4

Condenser tubes are not made of_________________?


aCartridge brass


bMuntz brass


cWood metal


dAluminium brass alloy


View Answer Wood metal

Evaporator used for concentrating tomato juice is made of __________________?


aNickel


bBrass


cStainless steel-glass lined


dCast iron-rubber lined



Lead lined equipments & vessels are suitable for handling __________________?


aHydrochloric acid (10%)


bNitric acid


cSulphuric acid upto 60°C


dAll A., B. and C.



Carbon is present in steel wholly in the__________________?


aCombined form


bFree state as graphite


cBoth A. and B.


dNeither A. nor B.


View Answer Combined form

Which of the following liquid metals has the highest thermal conductivity ?


aMolten sodium


b Molten lead


cMercury


dMolten potassium


View Answer Molten sodium

Maximum permissible sulphur content in steel is ______________ percent?


a0.015


b0.055


c0.505


d0.805


View Answer 0.055

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