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.Management Sciences
Category: Fluid Mechanics for Chemical
With increasing flow rate, the hydraulic efficiency of a centrifugal pump__________________?
A. Monotonically decreases
B. Decreases and then increases
C. Remains constant
D. Increases and then decreases
Pick out the wrong statement?
A. A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity
B. Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity
distribution
C. Laminar flow of viscous liquids is involved in the lubrication of various types of bearings
D. Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes
Pick out the wrong statement?
A. The form drag is dependent upon the occurrence of a wake
B. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance
C. An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity
D. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.
The capillary rise of mercury is maximum in glass tube of dia _____________ mm?
A. 0.5
B. 1
C. 2
D. 5
A streamline is_________________?
A. The line connecting the mid-points of flow cross-sections
B. Defined for uniform flow only
C. Drawn normal to the velocity vector at every point
D. Always the path of a particle
Quicksand is an example of a __________ fluid?
A. Bingham plastic
B. Dilatant
C. Newtonian
D. Pseudo plastic
For steady ideal fluid flow, the Bernoulli’s equation states that the_________________?
A. Velocity is constant along a stream line
B. Energy is constant throughout the fluid
C. Energy is constant along a stream line, but may vary across stream lines
D. None of these
Cavitation occurs in a centrifugal pump when the suction pressure is________________?
A. Less than the vapour pressure of the liquid at that temperature
B. Greater than the vapour pressure of the liquid at that temperature
C. Equal to the vapour pressure
D. Equal to the developed head
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