chemical engineering MCQs – Page 226

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 Review each marked answer and report any item that may be outdated or unclear.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
4501. At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?
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A. Remains unchanged

B. Decreases

C. Increases

D. Increases linearly

4502. The value of Troutons ratio (?b/Tb) for a number of substances is 21 (where, ?b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, K). The Kistyakowsky equation is used for calculation of Troutons ratio of _____________ liquids?
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A. Polar

B. Non-polar

C. Both A. & B.

D. Neither A. nor B.

4503. The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent?
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A. More than

B. Either more or less; depends on the solvent

C. Equal to

D. Less than
4504. With rise in temperature, the heat capacity of a substance___________________?
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A. Decreases

B. Remains unchanged

C. Increases

D. Either A. or B.; depends on the substance

4505. Pick out the wrong statement?
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A. Liquid metals and Dowtherm are used for very high temperature heating

B. Safety valves are provided in heat exchangers for removal of non-condensable

C. In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube

D. the condensate

E. A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining

4506. Internal energy of a substance comprises of the _____________ energy?
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A. Rotational

B. Vibrational

C. Translational

D. All A., B. & C.
4507. Which of the following fluid flow measuring devices can measure the largest flow rate ?
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A. Weir

B. Orificemeter

C. Rotameter

D. V-notch

4508. For a feed back control system to be stable, the _________________?
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A. Poles of the closed loop transfer function should lie in the right half of the complex plane

B. Poles of the closed loop transfer function should lie in the left half of the complex plane

C. Roots of the characteristic equation should be real

D. Bode plots of the corresponding open loop transfer function should monotonically decrease

4509. Mcleod gauge is used to measure the __________________?
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A. Point velocity

B. Vacuum

C. Flow rate

D. Pressure

4510. Zirconia probe is used for the measurement of___________________?
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A. % CO2 in flue gas

B. % O2 in flue gas

C. Humidity of air

D. Speed of a submarine

4511. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ C?
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A. 750

B. 250

C. 500
4512. High temperature of around 2000C of incandescent gas mantles is measured by a/an __________________?
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A. None of these

B. Radiation pyrometer

C. Optical pyrometer

D. Specially designed thermocouple

4513. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?
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A. Fused metal (Na or K) in steel thermometer

B. Mercury in glass thermometer

C. Alcohol in glass thermometer

D. Mercury in steel thermometer

4514. Polarograph is meant for the analysis of __________________?
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A. Isotopes

B. Miscible liquids

C. Gaseous mixture

D. Solids
4515. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?
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A. (T1S + 1)/(T2S

B. e-?S

C. (T1S/(T2S + 1)

D. (T1S + 1)/(T2S + 1)

4516. Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?
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A. Increase of pressure

B. Differential linear expansion

C. Volumetric expansion

D. Increase of thermal conductivity

4517. Time constant is the __________________?
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A. Same as transportation lag

B. Time required by the measured variable to reach 63.2% of its ultimate change

C. Same as dead time

D. Time taken by the controlled variable to reach 63.2% of its full change
4518. In a binary liquid solution of components A? and B?, if component A? exhibits positive deviation from Raoults law, then component B? ?
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A. May exhibit either positive or negative deviation from Raoults law

B. Exhibits negative deviation from Raoults law

C. Exhibits positive deviation from Raoults law

D. Obeys Raoults law

4519. Which of the systems having following transfer functions is stable ?
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A. exp (-20s)/(s2 + 2s 1)

B. 1/(s2 + 2s + 2)

C. 1/(s2 2s + 3)

D. 1/(s2 + 2)

4520. Stabilising time for the controllers is the time required for the response to reach _____________ percent of its ultimate value?
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A. 87.5

B. 100

C. 95

D. 63.2