chemical engineering MCQs – Page 235

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 Review each marked answer and report any item that may be outdated or unclear.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

4681. Starting temperature of optical radiation pyrometer is ______________ C?
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A. 1200

B. 400

C. 1500

D. 800

4682. Which of the following ratios defines the recycle ratio in a chemical process ?
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A. Gross feed stream/recycle feed stream

B. Recycle stream/gross feed stream

C. Recycle stream/fresh feed stream

D. None of these

4683. On-off controllers are normally used for________________?
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A. None of these

B. Temperature changes

C. Flow rate changes

D. Low loads

4684. A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?
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A. 140

B. 345

C. 485

D. 350

4685. Mercury manometer (U-tube type) exemplifies a ______________ order system?
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A. Zero

B. Third

C. First

D. Second

4686. Dilatometer is used to measure __________________?
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A. Contraction/expansion due to changes in temperature

B. Deflection

C. Strain

D. Stress

4687. Transfer function of transportation lag is___________________?
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A. eTS

B. e-TS

C. 1/(Ts + 1)

D. None of these

4688. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?
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A. Pitot tube

B. Flow nozzle type flowmeter

C. Magnetic flowmeter

D. Turbine flowmeter

4689. In an exothermic chemical reactor, the manipulated variable is the flow rate of_______________?
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A. Coolant

B. Product

C. None of these

D. Reactants

4690. The operation of a Rotameter is based on ________________?
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A. Pressure at a stagnation point

B. Variable flow area

C. Pressure drop across a nozzle

D. Rotation of a turbine

4691. Platinum resistance thermometer can be used upto antimony point which is ____________ C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?
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A. 1261.93

B. 630.74

C. 1064.43

D. 961.93

4692. Which of the following judges the accuracy of an instrument ?
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A. None of these

B. Drift

C. Static error

D. Dead zone

4693. For an input forcing function, X(t) = 2t2, the Laplace transform of this function is________________?
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A. 2/s3

B. 4/s2

C. 2/s2

D. 4/s3

4694. Thermistors are made of__________________?
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A. Metal oxides

B. Nickel-chromium alloys

C. Ultra pure metals

D. Iron-copper alloys

4695. Normal mercury thermometer can be used to measure a temperature of about 300C. However, its maximum temperature measurement range can be increased upto about 500C by__________________?
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A. Increasing the diameter of the tube

B. Using steel tube in place of glass tube

C. Filling nitrogen under pressure in the stem

D. Accounting for the tube expansion

4696. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40C. The fraction of the total pressure exerted by oxygen is_________________?
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A. 4-Jan

B. 2-Jan

C. 3-Feb

D. 1/3

4697. Paramagnetism method is not used for the composition determination of ______________ in gases?
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A. Oxygen

B. Carbon dioxide

C. Any of these

D. Oxides of nitrogen

4698. Viscosity of atmospheric air may be about _____________ centipoise?
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A. 0.015

B. 1.5

C. 150

D. 15

4699. Range of hydrogen gas constant volume thermometer is _____________ C?
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A. 0 to 100

B. 100 500

C. -10 to 20

D. 400 1000

4700. Which of the following thermocouples has the least temperature measurement range ?
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A. Iron-constantan

B. Copper-constantan

C. Chromel-alumel

D. Platinum-platinum/rhodium

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