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
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

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

B. Diffuser

C. Turbine

D. None of these

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
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

6422. The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids ?
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A. Having high viscosities

B. Moving at low velocities

C. Both A. & B.

D. Neither A. nor B.

6425. Glass pipes can be joined by__________________?
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A. Flanges

B. Welding

C. Bell and spigot joint

D. Soldering

6426. Multistage compressors are used in industry, because they____________________?
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A. Reduce the cost of compressor

B. Resemble closely to isothermal compression

C. Reduce the size requirement

D. Are easy to control

6430. In turbulent flow, the__________________?
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A. Momentum transfer is on molecular scale only

B. Fluid particles move in an orderly manner

C. Shear stresses are generally larger than in a similar laminar flow

D. Shear stress is caused more effectively by cohesion than momentum transfer

6431. The capacity of a centrifugal pump Can be increased by increasing the_________________?
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A. All A., B. and C.

B. Impeller diameter or speed

C. Number of pumps and joining them in series

D. Number of pumps and joining them in parallel

6433. The most serious disadvantage of an orificemeter is that________________?
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A. It is not very accurate

B. Most of the pressure drop is not recoverable

C. It is very costly

D. It is not suitable for measuring gas flow

6437. Which of the following exemplifies a three dimensional fluid flow ?
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A. Viscous fluid flow between converging plates

B. Fluid flow between parallel plates

C. None of these

D. Fluid flow at the inlet to a nozzle
6438. With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________________?
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A. Increases

B. May increase or decrease; depends on the magnitude of shear rate

C. Decreases

D. Remain same

6440. The buoyant force acting on a floating body is dependent on the _______________?
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A. Weight of the liquid displaced

B. Surface tension of the liquid

C. Viscosity of the liquid

D. Depth of immersion of the body

6443. The energy loss in flow through Venturimeter is less than that through flow nozzle, because in case of a flow nozzle, the ?
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A. Length is shorter

B. Throat diameter is more

C. Sudden expansion of flow in the downstream occurs

D. Distance between the throat and the inlet is more

6444. Water hammer in a pipeline results from the____________________?
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A. None of these

B. Pressure increase due to closure of a valve resulting in decrease in rate of flow

C. Rapid pressure change due to a rapid change in the rate of flow

D. Bursting of pipelines due to closure by a valve

6445. Normal depth in open channel flow is the depth of flow in the channel ____________________?
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A. Measured normal to the channel bed

B. None of these

C. Corresponding to steady flow

D. Corresponding to uniform flow
6446. f = 16/NRe, is valid for__________________?
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A. Steady flow

B. Laminar flow through an open channel

C. None of these

D. Turbulent flow

6447. Momentum correction factor used in fluid flow problems accounts for the__________________?
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A. Change in pressure

B. Non uniform direction of velocities at inlet & outlet sections

C. Change in total energy

D. Change in direction of flow

6448. Curve III in the bellow diagram represents a/an________________?
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A. Ideal plastic

B. Pseudo plastic fluid

C. None of these

D. Dilatent fluid

6449. Velocity distribution for flow between two fixed parallel plates_________________?
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A. Is zero at the plates and increases linearly to the mid-plane

B. None of these

C. Varies parabolically across the section

D. Is constant over the entire cross-section