chemical engineering MCQs – Page 177

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 Review each marked answer and report any item that may be outdated or unclear.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

3521. The minimum shell thickness for tank ? 15 metres diameter is limited to _______________ mm, for reasons of elastic stability?
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A. 15

B. 5

C. 2

D. 10

3522. The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________?
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A. 1.5 to 2

B. 1 to 1.5

C. 0.5 to 1

D. 2 to 2.5

3523. (Le/D) for a Tee (used as elbow, entering run) would be around _______________________?
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A. 200

B. 5

C. 60

D. 160

3524. Spherical shaped pressure vessel is considered to be the most ideal, because it can___________________?
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A. Withstand higher pressure for a given metallic shell thickness

B. Be designed without wind load considerations

C. Be supported very easily

D. Be fabricated very easily

3525. Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_____________?
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A. Same

B. More

C. Twice

D. Less

3526. Thin spherical shells subjected to internal pressure, develop ______________ stresses?
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A. Radial

B. Circumferential

C. Both A. & B.

D. Neither A. nor B.

3527. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is ________________ cms?
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A. 50

B. 5

C. 15

D. 7.5

3528. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter___________________?
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A. Remain unaffected

B. Increases

C. Decreases

D. None of these

3529. The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is______________________?
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A. pd/3t

B. pd/2t

C. pd/t

D. pd/4t

3530. The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________?
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A. 0.5 d

B. d

C. 2 d

D. 0.75 d

3531. Which of the following lengths of heat exchanger tubes are normally not used in practice ?
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A. 6 metres

B. 10 metres

C. 0.5 metre

D. 2.5 metres

3532. The value of fouling factor depends upon the__________________?
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A. Characteristic of process fluid

B. Velocity of process fluid containing suspended solids

C. All A., B. and C.

D. Suspended solids in the fluid

3533. If D is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of__________________?
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A. D/2 or minimum 2? to 5D

B. D/5 or minimum 2? to 5D

C. None of these

D. D/5 or minimum 2? to D

3534. Pressure drop due to pipe fittings can be estimated by the equation, ?P/? = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45 elbow and 180 close return bends would be respectively around______________________?
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A. 5 and 10

B. 180 and 300

C. 300 and 500

D. 45 and 75

3535. Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_______________?
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A. 0.4-0.6

B. 0.55-0.85

C. 0.35-0.75

D. 0.1-0.2

3536. n the agitators, the power required will be changed with the increase of diameter of agitator D. as ____________________?
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A. D5

B. D2

C. D9

D. D

3537. The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _____________ stress?
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A. Ultimate

B. Yield point

C. None of these

D. Breaking

3538. Smokers equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?
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A. Relative volatility is close to one (e.g., separation of close boiling isomers)

B. Feed is not at its bubble point

C. Number of equilibrium stages required is likely to be very small

D. Number of equilibrium stages in only stripping section is to be calculated

3539. Low pressure steam (with saturation temperature between 105 to 120C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?
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A. 650

B. 450

C. 750

D. 250

3540. Lug support is meant for supporting _______________ vessels?
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A. Thick walled tall

B. Large horizontal cylindrical

C. Tall but empty

D. Small

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