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

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bPartially condensed vapour with quality of 0.9

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c Saturated vapour

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dPartially condensed vapour with quality of 0.1

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View Answer Superheated vapour

Most of the common metals have ______________ crystal structure?


aCubic

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bHexagonal

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cOrthorhombic

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dNone of these

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View Answer Cubic

Ball bearings are normally made of _____________ steel?


aHigh speed

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bHigh carbon

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cChrome

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dSilicon

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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

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b -30.2

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c 55.2

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d -55.2

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View Answer -19.4

Condenser tubes are not made of_________________?


aCartridge brass

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bMuntz brass

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cWood metal

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dAluminium brass alloy

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View Answer Wood metal

Evaporator used for concentrating tomato juice is made of __________________?


aNickel

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bBrass

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cStainless steel-glass lined

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dCast iron-rubber lined

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Lead lined equipments & vessels are suitable for handling __________________?


aHydrochloric acid (10%)

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bNitric acid

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cSulphuric acid upto 60°C

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dAll A., B. and C.

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Carbon is present in steel wholly in the__________________?


aCombined form

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bFree state as graphite

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Combined form

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


aMolten sodium

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b Molten lead

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cMercury

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dMolten potassium

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View Answer Molten sodium

Maximum permissible sulphur content in steel is ______________ percent?


a0.015

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b0.055

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c0.505

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d0.805

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View Answer 0.055

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