Chemical Engineering MCQs

Page No. 811

A dense structure of grinding wheel is not used for the_____________________?


aDuctile material


bHard materials


cBrittle materials


dFinishing cuts


View Answer Ductile material

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity_________________?


aIs trebled


bRemains unchanged


cDecreases by a factor of 3


dDecreases by a factor of 1/3


View Answer Remains unchanged

Pressure required to increase the density of water by about 1% is ____________________ atmosphere?


a10


b50


c200


d1000


View Answer 200

The starting of a car takes time in winter, because the__________________?


aOctane number of fuel is decreased


bFuel supply for ignition is not sufficient


cVaporisation of the fuel is decreased


dPour point of fuel decreases



The difference between gross & net calorific values of fuel is due to the___________________?


aSensible heat carried away by the flue gases


bHeat carried away by the steam from the moisture content of the fuel


cHeat lost by radiation


dHeat carried away by steam from the combustion of hydrogen in the fuel



Speisses is a mixture of the following ?


aArsenides of heavy metals


bAntimonides of heavy metals


cArsenides & antimonides of heavy metals


dIron, cobalt and nickel



Factor of safety in machine design is defined as the ratio of ultimate stress to _____________ stress ?


aWorking


bBearing


cYield


dNone of these


View Answer Working

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air?


aWet bulb


bDry bulb


cSaturation


dDew point


View Answer Wet bulb

The elastic strain in copper is due to the__________________?


aMotion of dislocations


bStretching of atomic bonds


cBreakage of atomic bonds


dNone of the above



Which of the following fastening devices has a head at one end and a nut fitted to the other ?


aBolt


bStud


cTop bolt


dNone of these


View Answer Stud

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