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

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cSulphur content

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dIgnition temperature

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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

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

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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

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Pick out the wrong statement ?


aMain constituents of LPG are propane and butane

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

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

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dL.P.G. is lighter than air

✓



Pick out the wrong statement ?


aCokes of high reactivity are obtained from weakly coking coals

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bCokes of high reactivity are obtained from strongly coking coals

✓


cReactivity of coke is inversely proportional to its absolute density

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dAbrasion index of the coke is a measure of its hardness

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Pick out the wrong statement ?


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

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

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

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dNone of these

✓


View Answer None of these

Pick out the wrong statement ?


aAngle of repose of coal increases with its increasing size

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bSpecific gravity of coal increases with its increasing maturity

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

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

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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

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

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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

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Pick out the wrong statement ?


aPolystyrene is a thermoplastic polymer

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bProtein is a natural polymer

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cNeoprene is a natural rubber

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dPolythene is a copolymer, while SBR is a homopolymer

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Pick out the wrong statement?


aPolymers made of only one monomer is called homopolymer

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

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cVulcanised rubber is more elastic than natural rubber

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

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Pick out the wrong statement ?


aAddition polymers are generally formed by chain growth polymerisation

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bCondensation polymers are generally formed by step growth polymerisation

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cTeflon is formed by step growth polymerisation

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dBakelite is formed by step growth polymerisation

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