One shot Marathon Series II Fluid mechanics

For laminar flow at a point A, 2 m from the leading edge, boundary layer thickness is 3mm; another point B has a Boundary layer thickness 4 mm in the same viscous flow. The distance between the two points is _______ m.

Which device is popularly used for measuring difference of low pressure?

Which of the following statement is/are not correct? (following usual rotations).

A jet of water of 50mm diameter and with a velocity of 20m/s issued from nozzle strikes series of vanes mounted on periphery of wheel. The velocity (in m/s) of blade for maximum power condition is______.

A homogeneous 12 cm cube balanced by a 2 kg mass on the beam scale when cube is immersed in water The specific gravity of cube is (Assume g=10 m/sec²)

In an iceberg, 15% of the volume projects above the sea surface. If the specific weight of sea water is 10.5 kN/m³, the specific weight of iceberg in kN/m³ is?

The pressure gradient (in N/m² per m) for the laminar flow of oil with a maximum velocity of 4 m/s between two horizontal parallel fixed plates which are 100 mm apart is ____.
[Given .]

What is the ratio of displacement thickness to nominal boundary layer thickness, if velocity distribution is given as, .

In given figure, vacuum pressure is 90 mm of Hg, P_atm = 101.325 kPa, then the absolute pressure of gas container is

Which one of the following velocity profiles typically represents a fully developed incompressible, turbulent flow in pipe?

A fluid of viscosity 9 poise , density ρ = 900 kg/m³ is flowing between the parallel plate which are kept at a distance of 60 mm apart. If fluid having maximum velocity is 1.3 m/s. Calculate the head loss in a distance of 20 m.

A rectangular tank is moving horizontally with constant acceleration a = 3 m/s², if the water is filled in tank up to 2 m.

Given length of tank, l = 5 m,

Width, w = 2 m,

Depth, d = 2 m

Then select the correct options

As shown in the figure a U-tube manometer is used to measure the pressure of oil (sp. gravity= 0.8) flowing in a pipeline. The right limb of manometer contains mercury and is open to atmosphere. The difference in level of mercury is 15cm. What will be the difference in the level (in cm) of mercury if pressure of the oil in the pipeline is reduced to 10 kPa

A 300 × 150 mm venturi meter has a differential head of 1.4 m across the inlet and throat for a flow of 0.09 m³/s. The head loss between the inlet and throat is _____ m.

Consider a stepped cylindrical container filled with water. The container with its axis vertical is first placed with its larger diameter upward and then downward. The ratio of force at the bottom in the two cases.

A person is on the ship, he observes that a iceberg at some distance has a volume of 600 m³ above the level. If the density of iceberg is 915 kg/m³, Obtain the weight of iceberg ______ × 10⁶N (take water of Antarctica has density of 1050 kg/ m³).

The product of mechanical efficiency and hydraulic efficiency is known as?

A triangular lamina with it’s base on surface if water of length 2m & height being 1.50m. The centre of pressure of the lamina is_____.

A lawn sprinkler with two jets, each located at 20 cm from centre. The Jets are of 2 cm diameter. Assume no friction and direction of both jets are opposite. Find the speed of rotation (in rad/s) for a discharge of 3.5 l/s.

A beaker is filled with a liquid of specific gravity S = 1.2 as shown below. What will be the pressure difference (in kN/m²) between the two points A and B, 30 cm below and 10 cm to the right of point A?

Which of the following statements are NOT correct?