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

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cEmission spectroscopy

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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

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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

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bCapable of measuring the flow rate of slurries and electrolytes

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

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aMcleod gauge

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bAlphatron

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cIonisation gauge

✓


dBourdon gauge

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View Answer Ionisation gauge

______________ is undesirable in thermocouples used in industries ?


aLinear relation of emf to temperature

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bCorrosion resistance

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cOxidation resistance

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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

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bCarbon tetrachloride

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cParaffin

✓


dEthylene glycol

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View Answer Paraffin

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