chemical engineering MCQs – Page 238

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 Review each marked answer and report any item that may be outdated or unclear.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
4741. What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?
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A. 1/(1 + GH)

B. G/(1 + GH)

C. H/(1 + GH)

D. G/(1 GH)

4742. Kopps rule is helpful in finding the__________________?
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A. Heat capacities of gases

B. Heat capacities of solids

C. Molal heat capacities of gases

D. Activation energy

4743. Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half will result in _____________ in the volume of the gas?
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A. Doubling

B. 1/4th reduction

C. No change

D. Fourfold increase

4744. Which of the following is not a mechanical pressure sensing element ?
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A. Bellows

B. Bourdon tube

C. U-tube

D. Diaphragm

4745. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?
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A. H/G

B. H/(1 + G)

C. G/(1 + H)

D. G/H

4746. Which of the following thermocouples can measure the maximum temperature ?
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A. Iron-constantan

B. Tungsten-molybdenum

C. Chromel-alumel

D. Platinum-rhodium

4747. Characteristic equation is the denominator of ____________ loop transfer function?
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A. Open

B. Closed

C. Both A. and B.

D. Neither A. nor B.

4748. Liquid discharge from a tank or reservoir cannot be measured by __________________?
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A. Mouthpieces

B. Orificemeter

C. Weirs

D. Notches

4749. The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below: The appropriate transfer function of the process is_________________?
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A. (Q/R) e-TdS/(Q/P) (S + 1)

B. (Q/R) e-(P/Q)S/(TdS + 1)

C. (Q/P) e-TdS/(Q/R) (S + 1)

D. (Q/P) e-(Q/R)S/(TdS + 1)

4750. Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by _____________ effect?
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A. Peltier

B. Thomson

C. Seebeck

D. None of these

4751. Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity ?
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A. O2

B. N2

C. CO2

D. CO

4752. Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?
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A. 100C

B. Greater than 80.1C but less than 100C

C. Less than 80.1C

D. 80.1C

4753. The transfer function of a first order system is______________?
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A. 1/(Ts + 1)

B. s/(Ts + 1)

C. 1/Ts

D. None of these

4754. In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is__________________?
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A. Independent of temperature

B. Increased with decrease in pressure

C. Increases with rise in pressure

D. Unchanged with pressure changes

4755. In case of a ternary system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the______________?
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A. Solute concentration

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

4756. A system with transfer function [(2S/4S) + 1] is of _____________ order?
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A. 1st

B. 2nd

C. 3rd

D. Zero

4757. Isotopes of an element have the same__________________?
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A. Mass number

B. Atomic weight

C. Electronic configuration

D. Number of neutrons

4758. Which of the following may not need a moderator ?
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A. Homogeneous reactor

B. Pressurised water reactor

C. Candu reactor

D. Fast breeder reactor
4759. ____________ nuclear reactor does not require a heat exchanger to supply steam to power turbine?
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A. Boiling water

B. Helium cooled

C. Molten sodium cooled

D. Pressurised water

4760. One amu is equivalent to___________________?
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A. 9.31 MeV

B. 931 eV

C. 931 Mev

D. 931 J