GATE ME Fluid Mechanics PYQs & Answers — Page 4

Questions 31–40 of 76. Imported answers require independent review unless marked reviewed.

Which of the following is responsible for eddy viscosity (or turbulent viscosity) in a turbulent boundary layer on a flat plate?

Your answerChoose one option.

Nikuradse stresses

Reynolds stresses

Boussinesq stresses

Prandtl stresses

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A two dimensional flow has velocities in

and

directions given by

and

, where

denotes time. The equation for streamline passing through

Your answerChoose one option.

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A pressure measurement device fitted on the surface of a submarine, located at a depth

below the surface of an ocean, reads an absolute pressure of 4.2 MPa. The density of sea water is 1050 kg/m

, the atmospheric pressure is 101 kPa, and the acceleration due to gravity is 9.8 m/s

. The depth

is ______ m (round off to the nearest integer).

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Consider fully developed, steady state incompressible laminar flow of a viscous fluid between two large parallel horizontal plates. The bottom plate is fixed and the top plate moves with a constant velocity of

m/s. Separation between the plates is 5 mm. There is no pressure gradient in the direction of flow. The density of fluid is 800 kg/m

, and the kinematic viscosity is

/s. The average shear stress in the fluid is ______ Pa (round off to the nearest integer).

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Water flows out from a large tank of cross-sectional area

through a small rounded orifice of cross-sectional area

, located at

. Initially the water level, measured from

, is

. The acceleration due to gravity is

Diagram for Mechanical Engineering question 46

Neglecting any losses, the time taken by water in the tank to reach a level of

is __________ seconds (round off to one decimal place).

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A cylindrical jet of water (density = 1000 kg/m³) impinges at the center of a flat, circular plate and spreads radially outwards, as shown in the figure. The plate is resting on a linear spring with a spring constant

kN/m. The incoming jet diameter is

cm.

Diagram for Mechanical Engineering question 47

If the spring shows a steady deflection of 1 cm upon impingement of the jet, then the velocity of the incoming jet is ______ m/s (round off to one decimal place).

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A high velocity water jet of cross section area = 0.01 m² and velocity = 35 m/s enters a pipe filled with stagnant water. The diameter of the pipe is 0.32 m. This high velocity water jet enters additional water from the pipe and the total water leaves the pipe with a velocity 6m/s as shown in the figure.

Diagram for Mechanical Engineering question 48

The flow rate of entrained water is __________ litres/s (round off to two decimal places).

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Froude number is the ratio of

Your answerChoose one option.

buoyancy forces to viscous forces

inertia forces to viscous forces

buoyancy forces to inertia forces

inertia forces to gravity forces

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Which of the following conditions is used to determine the stable equilibrium of all partially submerged floating bodies?

Your answerChoose one option.

Centre of buoyancy must be above the centre of gravity

Centre of buoyancy must be below the centre of gravity

Metacentre must be at a higher level than the centre of gravity

Metacentre must be at a lower level than the centre of gravity

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Match the following non-dimensional numbers with the corresponding definitions:

Non-dimensional number	Definition
P: Reynolds number	1.
Q: Grashof number	2.
R: Nusselt number	3.
S: Prandtl number	4.

Your answerChoose one option.

P-1, Q-3, R-2, S-4

P-3, Q-1, R-2, S-4

P-4, Q-3, R-1, S-2

P-3, Q-1, R-4, S-2

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GATE ME Fluid Mechanics PYQs

Question 12

Question 13

Question 21

Question 22

Question 46

Question 47

Question 48

Question 14

Question 14

Question 15