chemical engineering MCQs – Page 316

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 Review each marked answer and report any item that may be outdated or unclear.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
6301. The contraction co-efficient for Bordas mouthpiece (for frictionless fluid) is__________________?
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A. 0.1

B. 1

C. 0.5

D. 0.94

6302. Propeller type centrifugal pumps are most suitable for__________________?
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A. Low capacity at low heads

B. High capacity at low heads

C. High capacity at high heads

D. Low capacity at high heads

6303. A Rotameter works on the principle of _______________ pressure drop?
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A. Constant

B. Variable

C. Both A. & B.

D. Neither A. nor B.

6304. Horsepower requirement for given pump capacity depends upon the_______________?
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A. All A., B. and C.

B. Discharge head

C. Suction lift

D. Specific gravity of the liquid

6305. At high Reynolds number_________________?
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A. Inertial forces control and viscous forces are unimportant

B. Inertial forces are unimportant and viscous forces control

C. Viscous forces predominate

D. None of these

6306. An ideal fluid is___________________?
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A. One, which obeys Newtons law of viscosity

B. Highly viscous

C. None of these

D. Frictionless & incompressible
6307. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?
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A. Increases

B. None of these

C. Brings about no further reduction of

D. Decreases

6308. In fluid flow, cavitation is caused, if the____________________?
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A. Fluid velocity decreases to zero

B. Total energy decreases

C. Both A. and B.

D. Flow pressure approaches its vapor pressure at the prevailing temperature
6309. Remote control valve is a _______________ valve?
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A. Globe

B. Gate

C. Needle

D. Butterfly
6310. _____________________ pumps are a group of vacuum pumps ?
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A. Submerged

B. Mono

C. Hyster

D. Sump

6311. Which of the following properties of a fluid is responsible for offering resistance to shear ?
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A. Specific gravity

B. Viscosity

C. All A., B., and C.

D. Surface tension

6312. With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity___________________?
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A. Squeezes

B. Unpredictable from the data

C. Widens

D. Does not change
6313. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stokes law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?
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A. One fourth as that of A

B. Twice as that of A

C. Four times as that of A

D. Same as that of A

6314. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for ______________ fluid?
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A. Pseudo-plastic

B. Dilatant

C. Newtonian
6315. Drag co-efficient CD, in Stokes law range is given by________________?
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A. CD = 18.4/Re.p

B. 5.p

C. CD = 0.079/Re

D. CD = 16/Re.p

E. CD = 24/Re.p
6316. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?
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A. Newtonian

B. Bingham

C. None of these

D. Perfect

6317. If the discharge of a centrifugal pump is throttled, then its suction lift_______________________?
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A. Increases

B. Remains unchanged

C. Decreases

D. Data insufficient to predict

6318. Drag is the force component exerted on an immersed object, ?
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A. Passing the centroid of the body at 60to the direction of motion

B. The component being normal to the flow direction

C. None of these

D. The component being parallel to the flow direction
6319. Which of the following is not a dimension-less parameter ?
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A. Fanning friction factor

B. Specific gravity

C. Euler number

D. None of these
6320. Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(?/D) + (1.26/NRe ?F). It reduces to Nikuradse equation for a value of (?/D) equal to __________________?
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A. 0

B. 0.5

C. ?

D. 1