chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 21

Practise multiple-choice questions from chemical engineering fluid mechanics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs
401. The kinetic energy correction factor for velocity distribution of laminar flow is_________________?
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A. 1

B. 2

C. 1.66

D. 0.5

402. Pitot tube measures the ______________ of a fluid?
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A. Average velocity

B. Average flow rate

C. Point velocity

D. Pressure

403. What is the normal range of exit cone angle of a Venturimeter ?
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A. 15 to 25

B. 7 to 15

C. 2 to 5

D. >25

404. Drag co-efficient in hindered settling is _____________ that in free settling?
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A. Equal to

B. Not necessarily greater than

C. Always greater than

D. Less than

405. Net positive suction head (NPSH) of a centrifugal pump must be____________________?
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A. Less than barometric pressure

B. Less than the vapour pressure of the liquid

C. Equal to the vapour pressure of the liquid

D. Greater than the vapour pressure of the liquid
406. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?
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A. All A., B. and C.

B. BHP required by the pump

C. NPSH required

D. Head of the liquid pumped

407. Which of the fluid forces are not considered in the Reynolds equation of flow ?
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A. Turbulent forces

B. Viscous forces

C. Compressibility forces

D. Pressure forces

408. Eulers equation of motion is a statement expressing____________________?
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A. Newtons first law of motion

B. Newtons second law of motion

C. Conservation of energy

D. Conservation of mass
409. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 ?
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A. Decreases linearly with V

B. None of these

C. Decreases as V2

D. Increases linearly with V
410. In fluid flow, the boundary layer separation cannot occur___________________?
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A. In case of boundaries experiencing form drag

B. At points of abrupt changes in the flow directions

C. None of these

D. In laminar flow

411. The inherent characteristic of an equal percentage valve relating flow rate q with valve stem movement x are described by the equation_________________?
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A. dq/dx = K/q

B. dq/dx = K

C. dq/dx = K.q

D. dq/dx = Kq2

412. Two dimensional stream function________________?
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A. Is constant along an equipotential surface

B. None of these

C. Relates velocity and pressure

D. Is constant along a stream line
413. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) ?
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A. 1/M

B. 1/?M

C. ?M

D. M

414. Friction produced by the formation of wakes is called the ______________ friction?
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A. None of these

B. Skin

C. Disk

D. Form
415. What is the normal range of exit cone angle of a Venturimeter ?
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A. 7 to 15

B. 2 to 5

C. >25

D. 15 to 25

416. Which of the following has the minimum compressibility ?
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A. Nitrogen at room temperature

B. Oxygen at room temperature

C. Water at room temperature

D. Air at room temperature

417. Surge tanks are provided in high pressure water pipelines to___________________?
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A. Facilitate easy dismantling of pipeline for cleaning and maintenance

B. None of these

C. Store a definite quantity of water all the time

D. Reduce the water hammer
418. Purpose of hydraulic accumulator is to_______________?
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A. Ensure intermittent supply of hydraulic pressure

B. Accumulate pressure to increase force

C. Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

D. Increase the pressure and store/ accumulate it

419. Each term of the Bernoullis equation written in the form, (p/?) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?
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A. None of these

B. Mass

C. Volume

D. Specific weight

420. Which of the following can be used for the direct measurement of volumetric flow rate of slurry ?
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A. Rotameter

B. Pitot tube

C. Venturimeter

D. Orificemeter