Chemical Engineering MCQs

Page No. 377

Liquid column manometers are used for measuring the pressure ______________ kgf/cm2?


a> 2 (gage)


b< 3 (gage)


c< 10 (gage)


d< atmospheric


View Answer < 3 (gage)

Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?


aThermal conductivity through the paper


bElectrical resistance through the paper


cMagnetic susceptibility


dNone of these



Mcleod gauge measures the _____________ pressure?


aPositive


bSub-atmospheric


cVery high


dAtmospheric


View Answer Sub-atmospheric

According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?


a


b45°


c90°


d180°


View Answer 180°

Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?


a250


b350


c550


d700


View Answer 550

Pyrometry refers to the measurement of temperature_________________?


aWith the mercurial thermometer upto 350°C


bDirectly


cWhich is of higher magnitude


dAll A., B. & C.



Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ?


aOptical pyrometer


bRadiation pyrometer


cPhotoelectric pyrometer


dThermocouples


View Answer Thermocouples

Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop?


aTank 1


bTank 2


cTank 3


dTank 4


View Answer Tank 3

A first order system with unity gain and time constant η is subjected to a sinusoidal input of frequency w = 1/η. The amplitude ratio for this system is______________?


a1


b0.5


c1/√2


d0.25


View Answer 1/√2

Silver point temperature is ______________ °C?


a760.5


b860.5


c960.5


d1060.5


View Answer 960.5

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