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GATE ME 2019: Fluid Mechanics Rapid Quiz-1

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Question 1

Water (density =1000 kg/m³) at ambient temperature flows through a horizontal pipe of uniform cross section at the rate of 1 kg/s. If the pressure drop across the pipe is 100 kPa, the minimum power required to pump the water across the pipe, in watts, is _______

Question 2

Hydraulic device is to be used to transmit power from shaft A to shaft B, but there should be no mechanical connection between the two shafts. Thus the hydraulic device used for the purpose is;

Question 3

A water mains 140 cm inner diameter contains water at a pressure head of 200 m. A smooth flat plate 2 m wide and 2 m long is subjected to flow of water along its length at a uniform velocity of 2 m/s. The maximum thickness of boundary layer for the flow to be remain laminar will be ____ mm.

Question 4

Consider laminar flow of water over a flat plate of length 1 m. The ratio of boundary layer thickness at point B and A is . Moreover the sum of the distances of points A and B from the leading edge is equal to length of the plate. The distances and from leading edge will be Moreover, Also,

Question 5

Water flows through a pipe of diameter 0.5 m. the value of velocity V as shown in 2 m/s. Then h is __________m.

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Question 6

For Laminar flow of an oil having dynamic viscosity μ = 1.67 Pa.s in a 0.2m diameter pipe, the velocity distribution is parabolic with a maximum point velocity of 2.5 m/s at the centre of the pipe. Calculate the shearing stresses at the pipe wall.

Question 7

A Bridge carries water locking gate which is 20 m high and 25 m long is supported by a friction less hinge at the bottom. If the fluid passing through the gate has a density of 1500 kg/m³, then the magnitude of force F needed to apply horizontally at the top of the gate to remain it closed will be

Question 8

A 2-D flow field is defined as $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\07_Fluid-Mechanics_BLok_files\image012.png$ . The equation of steamline passing through the point (1,1) is

Question 9

When a dolphin glides through air, it experiences an external pressure of 0.75 m of mercury. The absolute pressure on dolpin when it is 5 m below the free surface of the water is

Question 10

For a steady flow, the velocity field is

. The magnitude of the acceleration of a particle at (1, -1) is

Question 11

Water in a pipe is flowing at speed of 25m/s with pressure 550kN/m² which is 45m above sea level. What will be the total head of water in meters?

Question 12

Consider the following statements regarding streamline(s):
(i) It is a continuous line such that the tangent at any point on it shows the velocity vector at that point
(ii) There is no flow across streamlines
(iii)

is the differential equation of a streamline, where

are velocities in directions

, respectively
(iv) In an unsteady flow, the path of a particle is a streamline
Which one of the following combinations of the statements is true?

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ESE & GATE ME Fluid Mechanics & Machinery

Jan 14ESE & GATE ME