Fluid Mechanics...

Fluids that require a gradually increasing shear stress to maintain a constant strain rate are known as

A jet of water issues from a nozzle with a velocity of 20 m/s and it impinges normally on a flat plate moving away from it at 10 m/s. If the cross-sectional area of the jet is 0.02 m² and the density of water is taken as 1000 kg/m³, then the force developed on the plate is

The velocity in a wind tunnel is being measured using a Pitot-static tube connected to a vertical U-tube manometer. The density of air is 1.2 kg/m³ and the deflection of the manometer is 24 mm. The manometer fluid is water. The velocity measured by the Pitot-static tube is

A pipe of 100 m length and 200 mm diameter and friction factor 0.015 is to be replaced by a 400 mm diameter pipe of friction factor 0.012 to carry the same flow. For the head loss of the same magnitude which of the following statements are true?

A flat plate of width 2 m is moved with a velocity of 0.02 m/s in the downward direction. If the gap between the plate and the wall is 0.02 m, what is the average velocity of the fluid between the plate and the wall?

A power house has 5 impulse turbines. Each turbine has two runners. Each runner is installed with 4 nozzles. Total discharge is 40 m³/s.  Assuming coefficient of velocity as 0.985 and head as 250 m, which of the following statements are true?

A lubricant flows between two concentric cylinders, with an inner cylinder rotating at a speed of 4 m/s. The gap between the cylinders is 1 mm, and the dynamic viscosity of the lubricant is 0.05 Pa-s. What is the frictional resisting force per unit length of the cylinder?

A fluid flows between two parallel plates with a gap of 0.1 m. The top plate moves with a velocity of 2 m/s, and the fluid has a dynamic viscosity of 0.5 Pa-s. What is the force per unit area required to maintain the bottom plate stationary?

Select the correct option for the velocity profile

\(\frac{u}{V} = \frac{5}{2}\left( {\frac{y}{\delta }} \right) - \frac{1}{2}{\left( {\frac{y}{\delta }} \right)^2} + \frac{2}{3}{\left( {\frac{y}{\delta }} \right)^3}\)

A journal bearing has a journal diameter of 80 mm and a bush diameter of 81 mm. The bearing length is 25 mm, and the rotational speed of the journal is 1500 rpm. The viscosity of the lubricant is 0.4 Pa-s. What is the power loss due to friction in the bearing?

For turbulent flow through the pipe, the pressure drop is a function of.

A spherical air bubble with a diameter of 0.005 m is immersed in oil with a surface tension of 0.03 N/m. What is the difference in pressure across the air bubble?

If the outlet angle of the bucket for Pelton wheel is 60°, the maximum efficiency in the case of Pelton wheel neglecting friction in the bucket is:

 A cubic wooden block of edge 100 mm and weight 1 kN is sliding down on an inclined plane of inclination 30° with the horizontal. A Newtonian fluid with the viscosity 0.2 Ns/m² is layered on the inclined plane. If the thickness of the layer is 0.02 mm, then the terminal velocity of the block in m/s.

In a hydraulic press, the ram has a diameter 40 cm and plunger has a diameter of 5 cm. Initially the plunger and ram are at a height of 1m from the base and the base can withstand a maximum pressure of 260 kPa. Consider no frictional losses and g = 10 m/s²

The velocity field for a 2 D, steady and incompressible flow is represented as V = (5x) i – (5y) j. What would be the equation of stream line passing through point (1, 1).

A plate of width 1.5 m is moving at 1 m/s in a fluid with viscosity 0.2 Pa-s. The gap between the plate and the stationary wall is 0.1 m. What is the shear stress acting on the plate?

A ball of radius 0.02 m falls under the influence of gravity through a viscous fluid. The terminal velocity of the ball is reached when the gravitational force is balanced by the drag force. If the drag coefficient is 0.5 and the fluid has a viscosity of 0.1 Pa-s, what is the terminal velocity of the ball?

A vertical plate of height 1 m is moved with a velocity of 0.1 m/s in a fluid with a viscosity of 0.4 Pa-s. If the gap between the plate and the wall is 0.05 m, what is the shear stress on the plate?

A fluid near a solid wall has an approximated velocity profile given by \(u\left( y \right) = \;{U_\infty } \times \sin \left( {\frac{{\pi y}}{{2\delta }}} \right),\;0 \le y \le \delta \) . The walls shear stress is given by:

A smooth flat plate of length 5 m and width 2 m is moving with a velocity of 4 m/s in stationary air of density 1.25 kg/m³ and kinematic viscosity 1.5 × 10^-5 m²/s. The total drag force (N) on one side of the plate assuming that the boundary layer is turbulent from the very beginning is _________.

(Correct up to 2 decimals)

Assume for turbulent flow over a flat plate, local drag coefficient is:

A water tank is connected to a pipe with a diameter of 0.05 m. The pipe discharges water horizontally with a velocity of 2 m/s. What is the force exerted by the water on the pipe due to the discharge, assuming the density of water is 1000 kg/m³?

Kinematic viscosity of air at 20°C is given to be 1.6 × 10^-5m²/s. Itskinematic viscosity at 70°C will be vary approximately

Three identical pipes of lengh L, diameter d and friction factor f are connected in parallel between two reservoirs. What is the size of pipe of length L and of the same friction factor f equivalent to the above pipe?

The capillary rise at 20°C in clean glass tube of 1 mm diameter containing water is approximately