Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 256 of 557.

Chemical Engineering MCQs

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Identify the false statement?

A.Pitting corrosion is usually very localised

B.Martensitic steels are less susceptible to pitting corrosion than austenitic steels

C.Hydrogen embrittlement is facilitated by tensile stress

D.Stress corrosion cracking is facilitated by tensile stress

Explanation: The correct answer is Martensitic steels are less susceptible to pitting corrosion than austenitic steels.

Submitted by: Academy of Pakistan

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A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062?

A.10 m

B.30 m

C.11.8 m

D.11 m

Explanation: The correct answer is 11 m.

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A 2 kg object weighs 1.8 kgf on a spring balance. The value of ‘g’ at that location in m/sec2 is________?

A.9.81

B.10.88

C.0.95

D.8.82

Explanation: The correct answer is 8.82.

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Which of the following is not used as a moderator in nuclear reactor?

A.Beryllium

B.Light water

C.Molten sodium

D.Boron hydride

Explanation: The correct answer is Molten sodium.

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Use of grinding aids results in the ________?

A.Neither A. nor B.

B.Enhanced production rate

C.Both A. & B.

D.Finer products

Explanation: The correct answer is Neither A. nor B..

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Curve III in the bellow diagram represents a/an________?

A.Ideal plastic

B.Pseudo plastic fluid

C.Dilatent fluid

D.None of these

Explanation: The correct answer is Pseudo plastic fluid.

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Routh stability method uses ________ loop transfer function?

A.Neither A. nor B.

B.Either A. or B.

C.Closed

D.Open

Explanation: The correct answer is Closed.

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________ dished head is the strongest of all?

A.Elliptical

B.Torispherical

C.None of these

D.Hemispherical

Explanation: The correct answer is Hemispherical.

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The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)?

A.x-1.5

B.x-0.8

C.x1.5

D.x0.8

Explanation: The correct answer is x0.8.

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In case of an ideal solution, the total vapor pressure varies ________ with the composition expressed as mole fraction?

A.Exponentially

B.None of these

C.Linearly

D.Inversely

Explanation: The correct answer is Linearly.

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Which of the following is not a chemical step in a fluid solid catalytic reaction?

A.Adsorption

B.Desorption

C.None of these

D.Surface chemical reaction

Explanation: The correct answer is None of these.

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The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the ________ length?

A.None of these

B.Equivalent

C.Transition

D.Prandtl mixing

Explanation: The correct answer is Transition.

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Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss?

A.Venturimeter

B.Orificemeter

C.Rotameter

D.Flow nozzle

Explanation: The correct answer is Venturimeter.

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________ is a cohesive solid?

A.Sand

B.Wet clay

C.None of these

D.Wheat

Explanation: The correct answer is Wet clay.

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Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to________?

A.> 10000

B.4000

Explanation: The correct answer is > 10000.

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