chemical engineering MCQs – Page 240

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 Review each marked answer and report any item that may be outdated or unclear.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
4781. Sub-zero temperature (< 0C) can be measured by a constant volume gas thermometer employing ?
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A. None of these

B. Nitrogen

C. Helium

D. Hydrogen

4782. Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop?
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A. Tank 2

B. Tank 4

C. Tank 3

D. Tank 1

4783. Spent fuel from the nuclear thermal reactor contains__________________?
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A. Plutonium

B. Fission products

C. Unused fuel

D. All A., B. & C.
4784. The amplitude ratio for the sinusoidal response of a _____________ is 1?
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A. None of these

B. Transportation lag

C. First order system

D. Second order system

4785. Which of the following radiations is the least penetrating ?
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A. ?-rays

B. ?-rays

C. ?-rays

D. X-rays

4786. A fast breeder reactor____________________?
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A. Uses natural uranium as fuel

B. Does not require a moderator

C. Both A. and B.

D. Neither A. nor B.

4787. A stable system is the one___________________?
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A. Which satisfies the conditions for a servo problem

B. Which exhibits an unbounded response to a bounded input

C. None of these

D. For which the output response is bounded for all bounded input
4788. Heavy water (D2O) in a nuclear reactor serves as a_______________?
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A. Coolant

B. Moderator

C. Both A. & B.

D. Neutron absorber

4789. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?
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A. 4400

B. 2200

C. 1100

D. 3300

4790. ____________ moderator is used in a fast breeder reactor?
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A. Heavy water

B. Graphite

C. Beryllium

D. No
4791. Which of the following types of nuclear reactors is most prone to radioactive hazards ?
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A. Gas cooled reactor

B. Pressurised water reactor

C. Molten sodium cooled reactor

D. Boiling water reactor
4792. Phase margin is equal to_______________?
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A. Phase lag + 180

B. 180 phase lag

C. Phase lag 180

D. Phase lag + 90

4793. For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions?
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A. Sum

B. Ratio

C. Difference

D. Product
4794. What is the Laplace transform of sin t ?
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A. s/(1 + s2)

B. 1/(s2 1)

C. s/(s2 1)

D. 1/(s2 + 1)
4795. Dead zone is the__________________?
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A. None of these

B. Maximum change in the variable that does not change the reading of the instrument

C. Same as transportation lag

D. Same as time constant

4796. Which of the following factors is the most important in the site selection for a nuclear power plant ?
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A. Remotely located from residential areas

B. Proximity to fuel source

C. Abundant availability of water

D. Absence of earthquake prone zone in nearby areas
4797. The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the derivative time.) ?
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A. Kc(1 + ?is + (1/?D . s)

B. Kc(1 + ?is + ?D ). s

C. None of these

D. Kc[1 + (1/?is) + ?D . s)
4798. Pressure in a Pressurised Water Reactor (PWR) is used for ____________________?
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A. None of these

B. Pressurising the water in the primary coolant circuit

C. Superheating the steam

D. Maintaining constant pressure in the primary cooling circuit under varying loads
4799. Flame photometry is used for the determination of compositional analysis of_______________?
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A. Isotopes

B. Solids

C. Natural gas

D. Alkali metals
4800. The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?
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A. 4

B. 1

C. 2

D. 3