chemical engineering Mcqs
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

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.

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