Chemical Engineering MCQs

Page No. 296

The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?


aType (solid, liquid or gaseous)


bCalorific value


cSulphur content


dIgnition temperature



Pick out the wrong statement ?


aTheoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat


bBurning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature


cBurning the fuel with excess pure oxygen results in maximum theoretical flame temperature


dAdiabatic flame temperatures of actual combustions are always less than the maximum values



Pick out the wrong statement ?


aMain constituents of LPG are propane and butane


bC.V. of natural gas is about 10000 KCal/Nm3


cC.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)


dL.P.G. is lighter than air



Pick out the wrong statement ?


aCokes of high reactivity are obtained from weakly coking coals


bCokes of high reactivity are obtained from strongly coking coals


cReactivity of coke is inversely proportional to its absolute density


dAbrasion index of the coke is a measure of its hardness



Pick out the wrong statement ?


aPulverised fuel can be completely burnt with less percentage of excess air compared to lump coal


bLow grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel


cRegulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing


dNone of these


View Answer None of these

Pick out the wrong statement ?


aAngle of repose of coal increases with its increasing size


bSpecific gravity of coal increases with its increasing maturity


cRefractive index and reflectance of coal increases with the increasing rank of coal


dSpecific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal



Pick out the wrong statement?


aDenier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre


bCrimp is a measure of the difference between the length of the straightened and unstraightened fibre


cDacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning


dNylon fibres have greater water absorption capacity than polyester fibres



Pick out the wrong statement ?


aPolystyrene is a thermoplastic polymer


bProtein is a natural polymer


cNeoprene is a natural rubber


dPolythene is a copolymer, while SBR is a homopolymer



Pick out the wrong statement?


aPolymers made of only one monomer is called homopolymer


bPolymers made of more than one monomer is called copolymer or mixed polymer


cVulcanised rubber is more elastic than natural rubber


dThe intermolecular forces in thermoplastic polymers are intermediate to that of elastomers & fibres



Pick out the wrong statement ?


aAddition polymers are generally formed by chain growth polymerisation


bCondensation polymers are generally formed by step growth polymerisation


cTeflon is formed by step growth polymerisation


dBakelite is formed by step growth polymerisation



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