Chemical Engineering MCQs

Page No. 351

Pick out the first order system from among the following ?


aDamped vibrator


bMercury in glass thermometer kept in boiling water


cInteracting system of two tanks in series


dNon-interacting system of two tanks in series



Select the correct statement from the following?


aThe frequency response of a pure capacity process is unbounded


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


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


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



Pick out the wrong statement ?


aProportional controller is normally used for level control in industrial applications


bCSTR can be considered as a distributed parameter system


cDistributed parameter approach gives partial differential equation


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



Pick out the wrong statement?


aThere is no transfer lag for a single first order system


bStirred tank with a water jacket exemplifies an interacting system


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


dTransfer lag decreases as the number of stages decreases



Pick out the wrong statement?


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


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


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


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



Pick out the wrong statement?


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


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


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


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



Pick out the wrong statement?


aThe nucleus of a hydrogen atom is identical with a proton


bA, β-ray particle is identical with an electron


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


dPositron is heavier than a proton



Pick out the wrong statement?


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


bα-particle is identical with a doubly charged helium ion


cThe mass of deuterium atom is half that of helium atom


dGamma rays are high energy electrons



Pick out the wrong statement?


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


bElectrons have negligible mass and unit negative change


cDeuterium atom has one proton and two neutrons in its nucleus


dCadmium is capable of absorbing neutrons



Pick out the wrong statement ?


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


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


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


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



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