chemical engineering MCQs – Page 199

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 Review each marked answer and report any item that may be outdated or unclear.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

3961. A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?
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A. CPA > CPB

B. CPA < CPB

C. kA < 0.5 kB

D. kA >2 kB

3962. Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?
0

A. 0 to 2.2

B. 0 to 0.08

C. 0 to 0.8

D. 0 to 1.5

3963. An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a_________________?
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A. Heat exchanger

B. Boiler

C. Recuperator

D. Regenerator

3964. Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?
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A. U2 > U1

B. U1 = dirt factor U2

C. U1 > U2

D. U1 = U2

3965. The Graetz number is concerned with the___________________
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A. Mass transfer between a gas and a liquid

B. Absorption with chemical reaction

C. Heat transfer in laminar flow

D. Heat transfer in turbulent flow

3966. Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?
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A. Between two bodies in physical contact with each other

B. Between two bodies not in physical contact with each other

C. From one part of a body to the another part of the same body

D. Both B & C

3967. Hole diameter of the sieve trays in the distillation column ranges from ______________ mm?
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A. 4 to 8

B. 3 to 12.5

C. 1 to3

D. 12.5 to 18.5

3968. Floating head heat exchangers are used for the____________________?
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A. Heat transfer between corrosive fluids

B. Co-current heat transfer systems

C. Counter-current heat transfer systems

D. Cases where temperature difference between the shell and the tubes is more (>50C)

3969. A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design____________________?
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A. Only if the opening is on a horizontal cylindrical vessel

B. Irrespective of the shape of the vessel

C. Only if the opening is on spherical vessel

D. Only if the opening is on a vertical cylindrical vessel

3970. Which of the following types of reactors is the safest from operation point of view ?
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A. A vapor phase reactor

B. Pot type reactor

C. A liquid phase catalytic reactor

D. A liquid phase reactor

3971. In Fouriers law, the proportionality constant is called the______________________?
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A. Thermal diffusivity

B. Thermal conductivity

C. Heat transfer co-efficient

D. Stefan-Boltzmann constant

3972. For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone?
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A. Extremely low

B. No

C. High

D. Low

3973. Rivets are generally specified by the____________________?
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A. Head diameter

B. None of these

C. Overall length

D. Shank diameter

3974. Plancks distribution law is valid for _____________ bodies?
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A. Coloured

B. All A., B. & C.

C. Black

D. White

3975. Duhrings plot is of use in_________________?
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A. Absorption

B. Extractive distillation

C. Leaching

D. Evaporation

3976. A graph between _____________ is called Wilson plot?
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A. (1/U) Vs. (1/v0.8)

B. (1/v0.8) Vs. U

C. v0.8 Vs . U

D. (1/U) Vs. (1/V)

3977. jH factor for heat transfer depends upon the ____________ number?
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A. Prandtl

B. Nusselt

C. Biot

D. Reynolds

3978. Hoop (circumferential) stress induced in a thin walled Horton Sphere used for the storage of liquid ammonia under pressure is____________________?
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A. pD/2T

B. pD/6T

C. pD/4T

D. pD/3T

3979. The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?
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A. Some

B. Either more or less; depends on the nature of vapor

C. Less

D. More

3980. Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?
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A. Grashoff

B. Reynolds

C. Both a & b

D. Prandtl & Grashoff

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