Chemical Engineering MCQs

Page No. 351

Pick out the first order system from among the following ?


aDamped vibrator

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bMercury in glass thermometer kept in boiling water

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cInteracting system of two tanks in series

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dNon-interacting system of two tanks in series

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Select the correct statement from the following?


aThe frequency response of a pure capacity process is unbounded

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bThe phase lag of a pure time delay system decreases with increasing frequency

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cThe amplitude ratio of a pure capacity process is inversely proportional to frequency

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dThe amplitude ratio of a pure time delay system increases with frequency

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Pick out the wrong statement ?


aProportional controller is normally used for level control in industrial applications

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bCSTR can be considered as a distributed parameter system

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cDistributed parameter approach gives partial differential equation

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dNon-linear behaviour is exemplified by an on-off controller

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Pick out the wrong statement?


aThere is no transfer lag for a single first order system

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bStirred tank with a water jacket exemplifies an interacting system

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cTransfer lag is a characteristic of all higher order systems (other than first order systems)

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dTransfer lag decreases as the number of stages decreases

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Pick out the wrong statement?


aα-particle emission from a radioactive element makes it electrically negative

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bβ-particle emission from a radioactive element makes it electrically positive

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cA radioactive element having a half life period of 20 years will completely disintegrated in 40 years

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dThe disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

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Pick out the wrong statement?


aAtoms with same number of nucleons but different number of protons are called isobars

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bAtoms with same number of protons but different number of nucleons are called isoters

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cOut of α, β, and γ-rays, the one having maximum penetration power are γ-rays

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dThe product formed by emission of α-particle has mass number less by 4 units than the parent nuclide

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Pick out the wrong statement?


aThe nucleus of a hydrogen atom is identical with a proton

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bA, β-ray particle is identical with an electron

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cMass of an electron is about 1/1800th of the lightest nucleus

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dPositron is heavier than a proton

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Pick out the wrong statement?


aThe ratio of the density of the ‘nucleus’ to that of the ‘atom’ is 1012

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bα-particle is identical with a doubly charged helium ion

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cThe mass of deuterium atom is half that of helium atom

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dGamma rays are high energy electrons

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Pick out the wrong statement?


aThe disintegration rate of a radioactive substance cannot be increased by heating it

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bElectrons have negligible mass and unit negative change

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cDeuterium atom has one proton and two neutrons in its nucleus

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dCadmium is capable of absorbing neutrons

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Pick out the wrong statement ?


aFor the manufacture of styrene, the major raw materials are benzene and ethylene

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bOne important copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres

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cManufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis

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dPhenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available

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