chemical engineering Mcqs
6601. Eulers equation of motion is a statement expressing____________________?
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A. Conservation of mass

B. Conservation of energy

C. Newtons second law of motion

D. Newtons first law of motion

6603. In case of laminar flow of fluid through a circular pipe, the__________________?
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A. Shear stress over the cross-section is proportional to the distance from the surface of the pipe

B. Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection

C. ume of circumscribing cylinder</strong>

D. Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

E. Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the
6605. Open channel liquid flow is most conveniently measured by a__________________?
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A. Notch

B. Hot wire anemometer

C. Segmental orifice

D. Rotameter

6608. Boiler feed water pump is usually a ______________ pump?
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A. Diaphragm

B. Gear

C. Reciprocating

D. Multistage centrifugal
6609. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stokes law range is proportional to the_____________________?
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A. Square of particle size

B. Difference in the densities of the particle & fluid

C. Inverse of fluid viscosity

D. All A., B. and C.
6610. Re/NFr is called the _____________ number?
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A. Brinkman

B. Galileo

C. Archimedes

D. Euler

6613. Hydraulic radius is the ratio of ____________________?
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A. Square root of flow area to wetted perimeter

B. Wetted perimeter to flow area

C. Flow area to square of wetted perimeter

D. Flow area to wetted perimeter
6614. Which of the fluid forces are not considered in the Reynolds equation of flow ?
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A. Viscous forces

B. Pressure forces

C. Turbulent forces

D. Compressibility forces
6622. In an incompressible fluid, the density is____________________?
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A. Greatly affected by moderate changes in pressure

B. Greatly affected only by moderate changes in temperature

C. Not affected with moderate change in temperature & pressure

D. Sensible to changes in both temperature & pressure

6624. The pressure head of a flow meter remains constant for_________________?
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A. Pitot tube

B. Orificemeter

C. Venturimeter

D. Rotameter
6626. The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
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A. Reynolds number

B. Mach number

C. All A., B. and C.

D. Froude number

6628. Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?
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A. Length & diameter

B. Head & discharge

C. Length & discharge

D. Friction factor & diameter

6630. Boundary layer separation is caused by the_________________?
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A. Reduction of pressure gradient to zero

B. Boundary layer thickness reducing to zero

C. Adverse pressure gradient

D. Reduction of pressure to vapour pressure

6631. Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid________________?
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A. Is different for different fluids

B. Lies above the centroid of the plane surface

C. Is independent of the specific weight of the fluid

D. Is at the centroid of the plane surface

6632. The discharge through a Venturimeter depends upon _________________?
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A. Co-efficient of contraction only

B. Pressure drop only

C. Its orientation

D. None of these

6633. Fluidised beds are formed, when the__________________?
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A. Fluid friction is zero

B. Pressure forces equal gravity forces

C. Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

D. Gravity force is less than the fluid friction
6637. Pick out the Hagen-Poiseuille?s equation ?
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A. ?p/? = 4f (L/D) (V2/2gc)

B. ?p = 32 (?LV/gc. D2)

C. cDp)

D. ?p/L = 150 [(1 ?)/?3]. (?.V0

E. 2cD)

F. ?p/L = 1.75 [(1 ?)/?3]. (?V0

6638. The bulk modulus of elasticity of a liquid__________________?
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A. Is zero for incompressible liquid

B. Decreases with pressure

C. Is independent of temperature & pressure

D. Increases with pressure
6641. The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?
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A. Square of the difference in specific weights of solid & fluid

B. First power of its diameter

C. Inverse of the fluid viscosity

D. Inverse square of the diameter

6643. Foot valves provided in pumps are ____________ valves?
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A. Pressure reducing

B. Directional control

C. Relief

D. Three/four way

6644. Reynolds number is the ratio of____________________?
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A. Inertial forces to viscous forces

B. Viscous forces to gravity forces

C. Inertial forces to gravity forces

D. Viscous forces to inertial forces

6646. Capacity of a hydraulic accumulator is defined in terms of maximum_____________________?
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A. Flow rate through accumulator

B. Amount of energy stored

C. Volume available in the cylinder

D. Rate of falling of ram

6647. Centrifugal pump is normally classified on the basis of the________________?
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A. Impeller blade angle

B. rpm

C. Number of blades in impeller

D. Type of casing
6649. A fluid is a substance, that_________________?
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A. Has zero shear stress

B. Flows when even a small shear is applied to it

C. Is almost incompressible

D. Has to be kept in a closed container

6650. Check valves are used_______________?
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A. For controlling water flow

B. For unidirectional flow

C. In bends

D. At high pressure