chemical engineering MCQs – Page 239

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 Review each marked answer and report any item that may be outdated or unclear.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

4761. Gas cooling as compared to water cooling of nuclear reactors___________________?
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A. None of these

B. Cannot attain a high temperature

C. Is more efficient as gas has a higher specific heat

D. Can produce only saturated steam for feeding to power turbine

4762. Which of the following ores contains maximum percentage of uranium ?
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A. Thorium

B. Pitchblende

C. Carnotite

D. Rescolite

4763. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First empirical temperature scale developed was the _____________ scale?
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A. Centigrade

B. Reaumer

C. Fahrenheit

D. Kelvin

4764. An element having large number of ______________ is most easily subjected to nuclear fission?
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A. Nucleons

B. Electrons

C. Protons

D. Neutrons

4765. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
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A. It will completely disintegrate in four months

B. 3/4th of it will disintegrate in two months

C. It will completely disintegrate in two months

D. 1/8th of it will remain intact at the end of four months

4766. In a second order under damped system, the_________________?
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A. Time required for the response of first reach its ultimate value is called the response time

B. h the decrease of damping co-efficient</strong>

C. Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of

D. rshoot

E. Overshoot (which is a measure of how much the response exceeds the ultimate value) increase

F. None of these

4767. The closed loop pole of a stable second order system could be_______________?
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A. Both real and positive

B. Complex conjugate with positive real parts

C. Both real and negative

D. One real positive and the other real negative

4768. Use of molten metal as a coolant in fast breeder reactor helps in_________________?
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A. Accelerating the neutrons

B. Accelerating the reaction rate in the core

C. Rapid heat transfer from the core

D. Breeding neutrons

4769. Which of the following controllers has the least maximum deviation ?
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A. P-I-D controller

B. P-D controller

C. P-I controller

D. P-controller

4770. Maximum differential pressure in liquid manometer is ______________ psi?
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A. 30

B. 50

C. 40

D. 20

4771. A first order system with unity gain and time constant ? is subjected to a sinusoidal input of frequency w = 1/?. The amplitude ratio for this system is______________?
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A. 1

B. 0.25

C. 1/?2

D. 0.5

4772. The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years?
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A. 24

B. 18

C. 6

D. 36

4773. Commercial power generation from fusion reactor is not yet possible, because_____________________?
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A. It is difficult to initiate fusion reaction

B. The fuel required (e.g. deuterium and tritium) is scarce

C. It is difficult to control fusion reaction

D. Quantity of fuel required for initiating fusion reaction is prohibitively high

4774. A boiling water reactor is the one, in which the_______________________?
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A. Coolant water, after being heated in the reactor core, generates steam in a boiler

B. Fuel and the coolant are thoroughly mixed to form a homogeneous solution

C. Pressurised water is pumped into the core

D. Coolant water is allowed to boil in the core of the reactor

4775. Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at_______________?
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A. Gopalpur coast (in Orissa)

B. Kalpakkam (in Tamilnadu)

C. Jadugoda (in Jharkhand)

D. Alwaye (in Kerala)

4776. Dome temperature of blast furnace stove is most accurately measured by a____________________?
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A. platinum-platinum/rhodium thermocouple

B. Platinum resistance thermometer

C. Iron-constantan thermocouple

D. Radiation pyrometer

4777. Graphite is used in nuclear reactor as_____________________?
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A. Fuel

B. Insulation lining of the reactor

C. Retarder of neutron velocity

D. Lubricant

4778. What is the average life of a radioactive atom having a half life period of T ?
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A. 2T

B. 0.144 T

C. 1.44 T

D. 14.4 T

4779. Feed forward controller accounts for the ______________ changes?
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A. Set point

B. Load

C. Both A. & B.

D. Neither A. nor B.

4780. In nuclear reactions, ______________ number is conserved?
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A. Mass

B. Atomic

C. Both A. & B.

D. Neither A. nor B.

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