chemical engineering MCQs – Page 321

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 Review each marked answer and report any item that may be outdated or unclear.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
6401. ______________ is an example of axial flow impeller?
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A. Paddle

B. All A., B. and C.

C. Turbine

D. Propeller
6402. Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________?
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A. Remain same

B. Decrease

C. Increase

D. Data insufficient to predict pressure drop

6403. A streamline is a line in flow field _________________?
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A. Such that at every point on it, the velocity is tangential to it

B. Along which a fluid particle travels

C. None of these

D. That is traced by all the fluid particles passing through a given point

6404. _____________ forces do not act in case of fluid flow ?
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A. Vibratory

B. Elastic

C. Centrifugal

D. Tensile
6405. The maximum depth from which a centrifugal pump can draw water is________________?
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A. Dependent on the speed of the pump

B. 150 feet

C. 34 feet

D. Dependent on the power of the pump

6406. The losses in open channel flow generally vary as the ________________?
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A. Inverse square of hydraulic radius

B. Inverse of the roughness

C. Square of the velocity

D. First power of the roughness
6407. In case of Couette flow, the fluid flow is between two large flat parallel plates with___________________?
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A. Top plate moving and the bottom plate fixed

B. Bottom plate moving and the top plate fixed

C. Both the plates fixed

D. Both the plates moving

6408. Differential manometer measures the____________________?
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A. Sub-atmospheric pressure

B. Pressure difference between two points

C. Atmospheric pressure

D. None of these

6409. Steady non-uniform flow is exemplified by flow through a/an___________________?
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A. Expanding tube at increasing rate

B. Long pipe at constant rate

C. Expanding tube at constant rate

D. Long pipe at decreasing rate

6410. What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ?
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A. 1

B. 2

C. 0.5

D. 1.5

6411. Most of the centrifugal pumps used in chemical plants are usually ____________________ driven?
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A. Gas turbine

B. Steam

C. Diesel engine

D. Electric motor
6412. Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) ?
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A. d2

B. d1/3

C. d2/3

D. ?d
6413. ______________ pumps are axial flow pumps?
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A. Propeller

B. Diffuser

C. Turbine

D. None of these

6414. For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________?
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A. 2

B. 2

C. 2-Jan

6415. Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the______________?
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A. Wall roughness

B. Reynolds number

C. Both A. & B.

D. Neither A. nor B.

6416. A mixed flow centrifugal pump_______________________?
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A. Employs such an impeller, through which the flow is a combination of radial & axial flow

B. Mixes the two fluids before pumping them

C. Pumps the two fluids separately and then mixes them

D. Employs impellers in both the radial & axial directions

6417. Paper pulp is an example of _____________ fluid?
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A. Bingham plastic

B. Newtonian

C. Dilatant

D. Pseudo-plastic

6418. For a particle settling in water at its terminal settling velocity, which of the following is true ?
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A. Drag = buoyancy + weight

B. Buoyancy = weight + drag

C. Drag = weight

D. Weight = buoyancy + drag
6419. While starting an axial flow pump, its delivery valve should be kept _______________?
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A. Either open or closed

B. None of these

C. Closed

D. Open
6420. With increasing flow rate, the hydraulic efficiency of a centrifugal pump__________________?
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A. Decreases and then increases

B. Remains constant

C. Monotonically decreases

D. Increases and then decreases