Chemical Engineering MCQs

Page No. 385

A mercury thermometer cannot be used to measure the temperature below the freezing point of mercury, which is _____________ °C?


a -38.9


b-11.9


c-60.9


d-80.9


View Answer -38.9

The second order system with the transfer function 4/(s2 + 2s + 4) has a damping ratio of ___________________?


a2.0


b0.5


c1.0


d4.0


View Answer 0.5

The calibration data of a thermocouple with its cold junction at 0°C are given below. The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple ?


a3.26 mv


b0.80 mv


c2.46 mv


d2.43 mv


View Answer 2.46 mv

Presence of a small amount of water in the organic systems can be determined by the _____________ method?


aElectrical conductivity


bPolarimetry


cEmission spectroscopy


dDielectric constant end loss factor



Which of the following controllers has maximum offset ?


aP-controller


bP-I controller


cP-D controller


dP-I-D controller


View Answer P-controller

Which of the following flow-metering instruments is an areameter ?


aVenturimeter


bRotameter


cPitot tube


dHot wire anemometer


View Answer Rotameter

A magnetic flowmeter is_________________?


aBased on the principle of Faraday’s law


bCapable of measuring the flow rate of slurries and electrolytes


cBased on the linear relationship between the fluid flow rate and the induced voltage


dAll A., B. and C.


View Answer All A., B. and C.

Which is the most suitable instrument for measuring pressure below 3 microns ?


aMcleod gauge


bAlphatron


cIonisation gauge


dBourdon gauge


View Answer Ionisation gauge

______________ is undesirable in thermocouples used in industries ?


aLinear relation of emf to temperature


bCorrosion resistance


cOxidation resistance


dNon-linear relation of emf to temperature



Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is __________________?


aWater


bCarbon tetrachloride


cParaffin


dEthylene glycol


View Answer Paraffin

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