chemical engineering MCQs – Page 229

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

4561. Compositional analysis of ______________ is done using mass spectrometer?
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A. A solid

B. An alloy

C. An isotope

D. Natural gas

4562. Flow rate of a river is measured by a/an____________________?
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A. Kennison nozzle

B. Vane meter

C. Pitot tube

D. Open weir

4563. What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100C, if their vapor pressures at 100C are 1340, 560 and 210 mmHg respectively ?
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A. 880.5

B. 801.5

C. 756.2

D. 780.5

4564. Avogadro number is the number of molecules in one ____________ of a gas?
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A. Kilogram

B. gram

C. Litre

D. gm.mole

4565. 1 kg/cm2 is equal to________________?
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A. 1 metre of water column

B. 10 metres of water column

C. 1 KPa

D. 760 torr

4566. The boiling points for pure water and pure toluene are 100C and 110.6C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is___________________?
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A. 110.6C

B. Between 100 and 110C

C. Less than 100C

D. 100C

4567. The unit of time constant of a system is the same as that of___________________?
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A. None of these

B. Time

C. Velocity

D. (Time)-1

4568. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?
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A. Invar

B. Nickel

C. Brass

D. Chromel

4569. Positioning controllers are used for _______________?
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A. Temperature changes

B. Low loads

C. Flow rate changes

D. High loads

4570. For estimation of heat capacity of a solid compound, one can use________________?
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A. Troutons rule

B. Clapeyrons equation

C. Kopps rule

D. Gibbs equation

4571. Nichols chart deals with __________________?
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A. A.R. vs. phase lag of first order

B. A.R. vs. phase lag of second order

C. Frequency response values of controllers

D. Closed loop values vs. open loop values

4572. 1 ata is equivalent to_________________?
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A. 1 atm

B. 10 torr

C. 0.98 Pascal

D. 1 kgf/cm2

4573. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?
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A. Kc is increased

B. Kc is reduced

C. Derivative control action is introduced

D. Integral control action is introduced

4574. The ____________ of a vapor pressure thermometer is a secondary element ?
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A. Bourdon tube

B. None of these

C. Bulb

D. Pointer

4575. Number of gram equivalent of solute dissolved in one litre of solution is called its___________________?
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A. Formality

B. Molality

C. Normally

D. Molarity

4576. To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with ________________?
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A. Oil

B. Mercury

C. Air

D. A metal powder or graphite

4577. The unit step response of the transfer function (2s 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?
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A. Increasing decreasing and then increasing

B. A monotonic increase

C. Initially increasing and then decreasing

D. A monotonic decrease

4578. What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?
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A. 2 AT

B. ?(AT)

C. 0.5 AT

D. 1.5 AT

4579. _____________ kg of CaC03 on heating will give 56 kg of CaO?
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A. 1000

B. 56

C. 144

D. 100

4580. An amplitude ratio of 0.1 corresponds to _____________ decibels?
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A. 20

B. -20

C. -10

D. 10

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