GATE XE year:2020 PYQs & Answers — Page 3

Questions 21–30 of 175. Imported answers require independent review unless marked reviewed.

Players

and

take turns to throw a fair dice with six faces. If

is the first player to throw, then the probability of

being the first one to get a six is ____ (round off to two decimal places).

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Figures given below show the velocity and shear stress profiles for the flow in a duct. In each option, ‘1’ represents velocity profile and ‘2’ represents shear stress profile.

Choose the correct option that closely represents the turbulent flow condition.

Your answerChoose one option.

Diagram for Engineering Sciences question 1

Diagram for Engineering Sciences question 1 (figure 2)

Diagram for Engineering Sciences question 1 (figure 3)

Diagram for Engineering Sciences question 1 (figure 4)

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The variation of shear stress (

) against strain rate (

) is given in the Figure. Identify the line/curve among P, Q, R and S, that represents an ideal fluid.

Diagram for Engineering Sciences question 2

Your answerChoose one option.

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A body is under stable equilibrium in a homogeneous fluid, where CG and CB are center of gravity and center of buoyancy, respectively.

Two statements ‘P’ and ‘Q’ are given below:

P: For a fully submerged condition, CG should always be below CB

Q: For a floating body, CG need not be below CB

Choose the option that is valid for the present situation.

Your answerChoose one option.

P is False; Q is True when metacentre is below CG

P is False; Q is True when metacentre is above CG

P is True; Q is True when metacentre is below CG

P is True; Q is True when metacentre is above CG

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A laminar hydrodynamic boundary layer over a smooth flat plate is shown in the Figure. The shear stress at the wall is denoted by

. Which one of the following conditions is correct.

Diagram for Engineering Sciences question 4

Your answerChoose one option.

Pressure is varying along ‘x’ and

Pressure is constant along ‘x’ and

Pressure is varying along ‘x’ and

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A non-dimensional number known as Weber number is used to characterize which one of the following flows,

Your answerChoose one option.

Motion of fluid in open channel

Motion of fluid droplets

Motion of fluid at high velocity

Motion of fluid through a pipe

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A uniform approach flow is subjected to an unsteady and periodic flapping plate as shown in the Figure. Tracer is released to obtain flow visualization lines, which are marked as ‘P’, ‘Q’ and ‘R’.

Choose the correct option that the line ‘R’ represents

Diagram for Engineering Sciences question 6

Your answerChoose one option.

Streakline

Streamline

Pathline

Timeline

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The volume flow between any two points not lying on the same stream in a flow field is equal to

Your answerChoose one option.

Change in strain rate between the points

Change in vorticity between the points

Change in potential function between the points

Change in stream function between the points

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A liquid flow through a horizontal smooth pipe of diameter 5 cm and discharges into a collection tank of dimension 50 cm x 50 cm x 50 cm. Time taken for a 10 cm rise of liquid level in the collection tank is 40 s.

The flow velocity in the pipe is ------ m/s (rounded off to two decimal places).

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The potential function for a two dimensional incompressible flow field is given as:

Magnitude of the velocity vector at point (2,1) is ________ m/s

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GATE XE year:2020 PYQs

Question 11

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9