chemical engineering MCQs – Page 249

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 Review each marked answer and report any item that may be outdated or unclear.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

4961. Radioactive decay of a material involves a _____________ order reaction?
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A. Third

B. Zero

C. First

D. Second

4962. The open loop transfer function of a control system is KR/(1 + TS). This represents ______________?
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A. Dead time system

B. A first order system

C. A second order system

D. A first order time lag

4963. Which is the strongest paramagnetic gas ?
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A. O2

B. NO2

C. CO2

D. NO

4964. An ideal coolant for a nuclear reactor should ________________?
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A. Have high density, but low heat transfer co-efficient

B. Be capable of attaining high temperature, only when it is pressurised

C. Be a good absorber of neutrons

D. Be free from radiation damage and non-corrosive

4965. Thermal neutrons which are used to cause the fission of U-235 have energy _____________ eV?
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A. > 1

B. > 200

C. < 0.025

D. 25-Jan

4966. The phenomenon of radioactivity was discovered by___________________?
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A. Madam Curie

B. Roentgen

C. J.J. Thomson

D. Becquerel

4967. Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor ?
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A. Boiling water

B. Pressurised water

C. CO2 gas cooled

D. Molten sodium cooled

4968. Molten sodium is used as a coolant in a fast breeder reactor, because of its_________________?
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A. Faster heat removal capability from the core

B. Neutron breeding capability

C. Excellent moderating properties

D. Capability to increase the reaction rate in the core

4969. The term analogous to the electrical current in a thermal system is the_________________?
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A. Temperature difference

B. None of these

C. Heat content in the system

D. Heat flow rate

4970. Continuous measurement of specific gravity of a liquid is done by __________________?
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A. Hydrometer

B. Contact-type electric indicators

C. Displacement meter

D. Both A. and C.

4971. Atoms of U-238 and U-235 differ in structure by three_____________________?
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A. Protons

B. Electrons

C. Electrons and three protons

D. Neutrons

4972. The calibration data of a thermocouple with its cold junction at 0C are given below. The hot junction of the thermocouple is placed in a bath at 80C, while its cold junction is at 20C. What is the emf of thermocouple ?
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A. 2.43 mv

B. 3.26 mv

C. 0.80 mv

D. 2.46 mv

4973. Fuel for a fast breeder reactor is_________________?
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A. Neptunium

B. Plutonium

C. Radium

D. Uranium

4974. The transfer function for a P-D controller is________________?
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A. Kc ?D s

B. Kc(1+?D s)

C. Kc(1 +1/?D s)

D. Kc/?D s

4975. The phenomenon of nuclear fission is opposite to that of__________________?
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A. Combustion

B. Thermionic emission

C. Radioactive decay

D. Nuclear fusion

4976. Which of the following is not used as a nuclear fuel cladding material ?
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A. Cadmium

B. Zircaloy

C. Stainless steel

D. Ceramics

4977. Unit of radioactivity is_________________?
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A. Barn

B. Fermi

C. Angstrom

D. Curie

4978. Hydrogen bomb employs the nuclear fusion of __________________ ?
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A. Helium

B. Deuterium

C. Tritium

D. Hydrogen

4979. Working principle of radiation pyrometer is based on the __________________?
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A. Kirchoffs law

B. Seebeck effect

C. Stefan Boltzmann law

D. Wiens law

4980. Gas analysis is commonly done using the___________________?
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A. X-ray diffraction

B. Emission spectrometer

C. Mass spectrometer

D. Thermal conductivity cell

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