Chemical Engineering MCQs

Page No. 760

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is ________________ mm?


a15


b25


c10


d30


View Answer 25

Out of the following substances, one ton of ______________ will store the maximum heat for a rise of 30°C in temperature ?


aSteel


bLignite


cWater


dLime stone


View Answer Water

On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?


aCreep


bToughness


cTensile strength


dFatigue


View Answer Toughness

‘Dikes’ are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel) ?


aV


bV/2


c2V


d3V


View Answer V

Ammonia gas can be dried by___________________?


aPCl5


bQuick lime


cCaCl2


dConcentrated H2SO4


View Answer Quick lime

The minimum temperature to which the water can be cooled in a cooling tower is the ______________ temperature of air?


aAmbient


bDry bulb


cDew point


dWet bulb


View Answer Dew point

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of__________________?


a23


b23/2


c25/2


d21/3


View Answer 23/2

Brazing filler metal used for joining steel plates_________________?


aMelts below the melting points of base metals


bMelts below 300°C


cIs copper phosphorous alloy


dIs copper



The activity of pure hydrogen gas at 1000°C and 5 atm pressure_________________?


aIs always less than 1


bIs always greater than 1


cCan be 5


dDepends on the choice of the standard state



Melting point & boiling points of liquid oxygen are respectively – 218.8°C & – 183°C, while the same for liquid nitrogen is – 210°C & – 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8 ?


a°C


b°F


c°K


d°R


View Answer °F

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