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GATE ME: Fluid Mechanics Revision Quiz

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Question 1

A Prandtl tube (Pitot-static tube with C_v=1) is used to measure the velocity of water. The differential manometer reading is 10 mm of liquid column with a relative density of 10. Assuming g = 9.8 m/s², the velocity or water (in m/s) is ________.

Question 2

For a fluid element in 2-D flow field (x-y plane), if it will undergo

Question 3

In order to avoid tendency of separation at the throat in a Venturimeter the ratio of the diameter at throat to the diameter of pipe should be:

Question 4

Which one is correct for Bernoulli’s equation
1) For a rotational flow Bernoulli’s equation can be applied at any point in a flow.
2) It is applicable for steady rotational incompressible flow.
3) It is not applicable within a boundary layer region.
4) For rotational flow it can be applied along a streamline.

Question 5

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.

Question 6

A geometrically similar hydraulic model of a spillway has been constructed on a scale of 1: 16. If the prototype discharge is 2048

/s, what would be the discharge in the model? (in m³/s)

Question 7

A cylinder of height 500 mm and radius 200 mm is open at the top and fully filled with water. Find the speed of rotation (in rpm) of cylinder at which one-fourth of the area at bottom of cylinder gets exposed.

Question 8

Determine the boundary layer thickness (in mm) at a distance of 1 m from the leading edge for a flow of air with free stream velocity of 25m/s over a plate. Kinematic viscosity of air is 0.15 stokes.

Question 9

A U-tube manometer is used to measure pressure drop between two points. The tube is found to be inclined at 45˚. The height of the column in one limb is 150mm and other limb is 210mm measured from the base of tube, parallel to the inclination. The tube is filled with water and g = 10 m/s. What is the pressure drop measured by the manometer.

Question 10

Consider the following statements:
1- A streamline is a curve drawn in space, which is tangent everywhere to the velocity vector.
2- No fluid may enter or leave a stream tube excepts through its ends.
3- A path line refers to the identity of a fluid particle.
4- For a streak-line analysis,a fixed point should be under consideration.
Which of the above are correct?

Question 11

A fluid having density ρ is flowing with inlet velocity V through a uniformly varying pipe bend at right angle as shown in the figure. The inlet cross-section area of the pipe is twice the outlet cross-section area. If the pressure P at both the ends is same, then the angle made by the resultant force exerted on the pipe bend with the horizontal is

Question 12

Water (p = 1000 kg/m³) flows through a venturimeter with inlet diameter 80 mm and throat diameter 40 mm. The inlet and throat gauge pressures are measured to be 400 kPa and 130 kPa respectively. Assuming the venturimeter to be horizontal and neglecting friction, the inlet velocity (in m/s) is

Question 13

In a turbulent flow over a flat plate, boundary layer thickness at a distance of 6m was observed to be 6mm, the Boundary Layer thickness at distance of 8m will be ____mm.

Question 14

The maximum possible blade efficiency of a single stage impulse turbine is 80% and velocity coefficient of blade is 0.85. If inlet and outlet blade angles of turbine are 30 ° and 40 ° then the nozzle angle (in degree) will be:

Question 15

Laminar boundary layer flow past the square plate arrangements is shown in figure. Comparing to the friction drag of a single plate (1), how much larger is the drag of four plates together as in configurations (2)

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ESE & GATE ME Fluid Mechanics & Machinery

Oct 18ESE & GATE ME