Chemical Engineering MCQs

Page No. 400

Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________?


aChromel-alumel


bIron-constantan


cPlatinum-platinum + rhodium


dNone of these


View Answer Chromel-alumel

Which of the following is never used as an element of industrial resistance thermometer ?


aLead


bNickel


cCopper


d30% iron + 70% nickel


View Answer Lead

Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________?


aChromel-alumel thermocouple


bOptical pyrometer


cRadiation pyrometer


dEither B. or C.


View Answer Either B. or C.

Liquid flow rate in an open channel cannot be measured by a/an __________________?


aOrifice meter


bCipolletti weir


cRectangular weir


dV-notch


View Answer Orifice meter

Conversion formula for converting amplitude ratio (AR) into decibels is ________________?


aDecibel = 20 log10 (AR)


bDecibel = 20 loge (AR)


cDecibel = 20 log10 (AR)0.5


dDecibel = 20 loge (AR)0.5



Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is __________________?


a12


b36


c54


d68


View Answer 36

Stroboscope is used for the measurement of _________________?


aRpm of a flywheel


bFrequency of light


cDepression of freezing point


dLiquid level under pressure


View Answer Rpm of a flywheel

Response of a linear control system for a change in set point is called __________________?


aFrequency response


bTransient response


cServo problem


dRegulator problem


View Answer Servo problem

Which of the following is not a composition measuring instrument ?


aThermal conductivity cell


bMass spectrometer


cPolarograph


dHot wire anemometer


View Answer Hot wire anemometer

Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?


aNo change


bDecrease


cIncrease


dExponential decrease


View Answer Increase

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