chemical engineering MCQs – Page 320

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 Review each marked answer and report any item that may be outdated or unclear.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

6381. Discharge from a 24 inch pipe of water at 10 ft/sec will be _____________ ft3/sec?
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A. 7.65

B. 125.6

C. 32.36

D. 48.22

6382. To handle smaller quantity of fluid at higher discharge pressure, use a ______________ pump?
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A. Volute

B. Rotary vacuum

C. Reciprocating

D. Centrifugal

6383. Which of the following denotes the effect of compressibility in fluid flow ?
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A. Weber number

B. Euler number

C. Mach number

D. Reynolds number

6384. In which of the following cases, it is possible for flow to occur from low pressure to high pressure ?
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A. Flow of liquid upward in a vertical pipe

B. Impossible in a constant cross-section conduit

C. Flow through a converging section

D. Flow of air downward in a pipe

6385. Minimum porosity for fluidisation is____________________?
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A. That corresponding to static bed

B. The porosity of the bed when true fluidisation begins

C. Less than that of the static bed

D. That corresponding to completely fluidised bed

6386. A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of _______________ shape?
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A. Trapezoidal

B. Rectangular

C. Circular

D. Triangular

6387. The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for ____________ fluid?
0

A. Bingham plastic

B. Dilatent

C. Newtonian

D. Pseudo-plastic

6388. Potential flow is the flow of______________?
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A. Incompressible fluids with no shear

B. Compressible fluids with shear

C. Compressible fluids with no shear

D. Incompressible fluids with shear

6389. In a fully turbulent flow (Re > 105) in a pipe of diameter d, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?
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A. d2

B. d2.5

C. d

D. d4

6390. A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be ______________ metres?
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A. 4

B. 8

C. 2

D. 5.5

6391. Capacity of a rotary gear pump can be varied by__________________?
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A. Changing the speed of rotation

B. Bypassing liquid from the suction or discharge line

C. All A., B. and C.

D. Bleeding air into suction

6392. The pressure head on sudden contraction in a horizontal pipe is converted into the _____________ head?
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A. Elevation

B. Velocity

C. Both A. & B.

D. Neither A. nor B.

6393. Which of the following conditions must be satisfied for lift force to be developed ?
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A. The body should be bluff body

B. The main stream velocity must approach the velocity of sound in that fluid medium

C. The body should be stream lined

D. Circulation around the body is essentially required

6394. A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?
0

A. None of these

B. 3.7 KPa

C. 2.94 KPa

D. 4.4 KPa

6395. For very low pressure and high discharge rate, the compressor used is a/an ______________ compressor?
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A. Rotary

B. None of these

C. Reciprocating

D. Axial

6396. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ? = surface tension of mercury)____________________?
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A. 1/d

B. 1/?

C. d

D. ?

6397. The line of action of the buoyant force acts through the____________________?
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A. Centroid of the volume of any floating body

B. Centre of gravity of a submerged body

C. None of these

D. Centroid of the displaced volume of fluid

6398. A centrifugal pump is called a turbine pump, if it is having a_________________?
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A. Rotating vaned volute

B. Vaned diffusion casing

C. Turbine type impeller

D. None of these

6399. The co-efficient of discharge of an orificemeter is a function of ________________?
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A. Reynolds number at the orifice

B. Ratio of orifice dia to pipe dia

C. Both A. and B.

D. None of the above parameters, and has a constant value of 0.61

6400. Non-colloidal solution is an example of the _______________ fluid?
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A. Pseudo-plastic

B. Non-Newtonian

C. Dilatent

D. Newtonian

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