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GATE ME 2018: Fluid Mechanics Rapid Revision Test

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Question 1

Streamline, streakline and path line are identical, when

Question 2

For the friction factor to be constant, the head loss due to friction in a pipe is proportional to

Question 3

A child blows air through a nozzle to form bubbles. If the bubbles are to have a diameter of 5mm. Calculate the surface tension between air and soap. The pressure contained by the bubble is 150 N/m².

Question 4

The pressure outside of the water droplet of diameter 0.06mm is 12 N/cm² . Calculate the pressure within the droplet. The surface tension is given as 0.08N/m.

Question 5

Is the static pressure more one meter below the surface of Lake or one meter below the surface of pond?

Question 6

Match the following pairs:

Question 7

Consider steady, incompressible and irrotational flow through a reducer in a horizontal pipe where the diameter is reduced from 20 cm to 10 cm. The pressure in the 20 cm pipe just upstream of the reducer is 150 kPa. The fluid has a vapour pressure of 50 kPa and a specific weight of 5 kN/m³. Neglecting frictional effects, the maximum discharge (in m³/s) that can pass through the reducer without causing cavitation is

Question 8

A long, square wooden block of side 1 m is pivoted along one edge o. The block in equilibrium when immensed in water to the depth as shown in figure.
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The specific gravity of wood. If friction in the pivot is negligible is ________.

Question 9

A 60 mm-diameter water jet strikes a plate containing a hole of 40 mm diameter as shown in the figure. Part of the jet passes through the hole horizontally, and the remaining is deflected vertically. The density of water is 1000 kg/m³. If velocities are as indicated in the figure, the magnitude of horizontal force (in N) required to hold the plate is ______

Question 10

A U-tube is made-up of two capillaries of diameters 1.0 mm and 1.5 mm respectively. The U-tube is kept vertically and partially filled with water of surface tension 0.0075 kg/m and zero contact angle. The differences in the level of meniscus caused by the capillarity is______ mm.

Question 11

A 1 : 10 spilway model has a discharge of 1.5 m³/s. if a flood phenomenon takes 15 hours to occur in the prototype. The time it will take in the model is ________ hours.

Question 12

A 30 cm diameter pipe is reduced to 15 cm diameter through gradual contraction. At this contraction, the difference between the Piezometric heads at the main and the contracted session is 50 mm of mercury. Neglecting losses, the discharge of water will be approximately

Question 13

An incompressible fluid flows over a flat plate with zero pressure gradient. The boundary layer thickness is 2 mm at a particular location. In an another case when location is at 50% more distance from the leading edge as compared to previous one, density of fluid is decreased by 20%, dynamic viscosity increases by 40% and velocity of fluid increased by 30%, what will be the boundary layer thickness?
[Consider flow to be laminar in both cases]

Question 14

Consider a steady incompressible flow through a channel as shown below.

The velocity profile is uniform with a value of at the inlet section A. The velocity profile at section B downstream is

The ratio is

Question 15

A Jet of water of diameter 60 mm moving with a velocity of 50 m/s, strikes a curved fixed symmetrical plate at the centre. The force exerted by the Jet of water in the direction of Jet, if Jet is deflected through an angle of 120 ° at outlet of curved plate is ___.

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ESE & GATE ME Fluid Mechanics & Machinery

Nov 27ESE & GATE ME