chemical engineering MCQs – Page 251

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 Review each marked answer and report any item that may be outdated or unclear.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

5001. In Bode plot, A.R. vs. w is plotted on a/an _____________ graph paper?
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A. Ordinary

B. Triangular

C. Semi-log

D. Log-lag

5002. Phase lag of the frequency response of a second order system to a sinusoidal forcing function______________?
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A. Is 120

B. Is 30

C. Is 90 at the most

D. Approaches 180 asymptotically

5003. The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at ___________________?
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A. -2, -3

B. -1, -4

C. 1, 4

D. 2, 3

5004. Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is_______________?
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A. 92

B. 200

C. 3

D. 235

5005. Out of the following thermocouple wire insulating material, the highest temperature rating is for________________?
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A. Ceramic fibre

B. Teflon

C. Fibre glass

D. Asbestos

5006. The function of moderators in nuclear reactor is to _________________?
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A. Control the chain reaction

B. Slow down the secondary neutrons

C. Absorb the secondary neutrons

D. None of these

5007. Stalagmometer is used for the measurement of__________________?
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A. Refractive index

B. Optical activity

C. Surface tension

D. Kinematic viscosity

5008. Isotopes of an element have different_________________?
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A. Electronic configuration

B. Chemical properties

C. Nuclear charge

D. Mass number

5009. Pick out the wrong statement ?
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A. ctor provides higher overall selectivity</strong>

B. For an ideal mixed reactor at steady state, the exit stream has the same composition as fluid

C. Reaction rate does not decrease appreciably as the reaction proceeds in case of an

D. ocatalytic reaction

E. hin the reactor and the space time is equivalent to holding time for constant density system

F. For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank

5010. Identify the group in which all the polymers mentioned can be used to make fibres ?
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A. Cellulose derivatives, Polyamides, Polyurethane

B. Polypropylene, Poly vinyl chloride, Silicon

C. Butadiene copolymers, Polyamides, Urea-formaldehyde

D. Cellulose derivatives, Polyisoprene, Polyethylene

5011. The half life period of a radioactive element depends on its _______________________?
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A. Amount

B. Pressure

C. None of these

D. Temperature

5012. Vulcanisation of rubber decreases its__________________?
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A. Working temperature range

B. Tensile strength

C. Resistance to organic solvents

D. Tackiness

5013. Pick out the correct statement?
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A. The capacity and the effectiveness of a screen are the same

B. The capacity and the effectiveness of screen are opposing factors

C. The screening surface of a reel (a revolving screen used in flour mills) is made of silk bolting

D. th supported by wire mesh

E. Both B. and C.

5014. Pick out the wrong statement?
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A. The difference between the existing temperature of a vapor and its saturation temperature (i.e.dew point) is called its degree of superheat

B. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure

C. The temperature at which a vapor is saturated is termed as the boiling point

D. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a superheated vapor

5015. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
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A. 1837

B. 10000

C. 2537

D. 159

5016. Nylon-6 is manufactured from _______________?
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A. Caprolactam

B. Maleic anhydride and Hexamethylenediamine

C. Sebacic acid and Hexamethylenediamine

D. Adipic acid and Hexamethylenediamine

5017. When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as____________________?
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A. Isobars

B. Isotones

C. Isomers

D. Isotopes

5018. Pick out the correct statement?
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A. A catalyst lowers the activation energy of the reacting molecules

B. In catalytic reactions, the catalyst reacts with the reactants

C. A catalyst initiates a chemical reaction

D. A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

5019. Which of the following is a fuel for a fusion reactor (thermonuclear reactor) ?
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A. U-233

B. Deuterium and tritium

C. Thorium

D. Heavy water

5020. Pick out the wrong statement?
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A. ?-particle emission from a radioactive element makes it electrically positive

B. ?-particle emission from a radioactive element makes it electrically negative

C. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

D. A radioactive element having a half life period of 20 years will completely disintegrated in 40 years

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