chemical engineering MCQs – Page 317

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 Review each marked answer and report any item that may be outdated or unclear.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
6321. The exit cone angle in case of a standard Venturimeter is _____________ the entrance cone angle?
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A. Either A. or B.

B. Greater than

C. Smaller than

D. Equal to

6322. Design of the casing of centrifugal pump should be such as to minimise the________________?
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A. None of these

B. Loss of static head

C. Loss of kinetic head

D. Back flow through impeller

6323. In case of a centrifugal pump, the theoretical head developed is dependent on the _____________ the impeller?
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A. Diameter of

B. Fluid velocity leaving

C. Speed of

D. All A., B. and C.
6324. The pressure intensity is the same in all directions at a point in a fluid________________?
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A. Regardless of the motion of one fluid layer relative to an adjacent layer

B. Only when the fluid is frictionless

C. When there is no motion of one fluid layer relative to an adjacent layer

D. Only when the fluid is at rest having zero velocity

6325. Froude number is not a factor__________________?
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A. When there is no vortex formation

B. For Reynolds number greater than 300

C. For unbaffled tank

D. None of these

6326. The line traced by a single fluid particle as it moves over a period of time is called ______________ line?
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A. None of these

B. Equipotential

C. Path

D. Stream

6327. Which of the following is used for pumping crude oil from oil well ?
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A. Duplex/triplex reciprocating pump

B. Gear pump

C. Screw pump

D. Single stage centrifugal pump

6328. The Mach number for hypersonic flow of compressible fluid is____________________?
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A. > 1

B. > 4

C. < 2

D. 1

6329. Propellers are____________________?
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A. Used for mixing liquids of high viscosity

B. Radial flow mixers

C. Low speed impeller

D. Axial flow mixers
6330. For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, ? = fluid viscosity ) ?
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A. 1/??

B. ?

C. 1/?

D. ??

6331. Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?
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A. Radial

B. Axial

C. Mixed

D. None of these

6332. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?
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A. 2

B. 1.5

C. 1

D. 0.5

6333. Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is _____________ mm?
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A. < 10

B. 4

C. > 12.5
6334. The component of acceleration resulting due to unsteady nature of flow is called ____________ acceleration?
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A. Normal

B. Local

C. Tangential

D. Convective

6335. In an incompressible flow of fluid, the fluid ________________?
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A. Compressibility is greater than zero

B. Temperature remains constant

C. Is frictionless

D. Density does not change with pressure & temperature
6336. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________?
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A. Rotameter

B. Pitot tube

C. None of these

D. Manometer

6337. Hydraulic mean depth (Dm) for a circular pipe of diameter D flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
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A. Flow rate

B. Mean velocity

C. Both a & b

D. Neither a nor b

6338. Enamels and paints are generally _______________ fluid?
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A. Dilatant

B. Pseudo-plastic

C. Rheopectic

D. Thixotropic

6339. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________?
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A. Discharge pressure

B. Flow of liquid during operation of the pump

C. Back flow of fluid in the event of stoppage of pump

D. All A., B. and C.

6340. A stream line is___________________?
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A. Fixed in space in steady flow

B. Always the path of particle

C. A line connecting the mid points of flow cross-section

D. Drawn normal to the velocity vector at every point