ESE CE Fluid Mechanics : National Champion Test for ESE & GATE CE Exams

Question 1

Oil (kinematic vicosty, ν_oil = 1 × 10⁻⁵ m²/s) flow through a pipe of diameter 500 mm with a velocity of 10 m/s ν_ω = 0.89 × 10⁻⁶ m²/s) diameter flowing through a model pipe of diameter 20 mm for satisfying the dynamic similarity, the velocity of water (in m/s) is __________

Question 2

Flow separation in flow past a solid object is caused by

Question 3

For a floating body, buoyant force acts at the

Question 4

In a two-dimensional velocity field with velocities u and v along the x and y directions respectively, the convective acceleration along the x-direction is given by

Question 5

Consider two hydraulic turbines having identical specific speed and effective head at the inlet. If the speed ratio (N₁/N₂) of the two turbines is 2, then the respective power ratio (P₁/P₂) is ________

Question 6

Match List-I with List-II and select the correct answer using the codes given below the lists:

Question 7

Pipes of length

,

etc and diameter

,

etc are connected in series. A single pipe of length

having same pressure loss as all pipes in series will have diameter equal to

Question 8

In a siphon system employed for carrying water from a reservoir A at a higher elevation to another reservoir B at lower elevation, both being separated by a higher hill, what will be the pressure at the' Summit (S)?.

Question 9

Assertion (A): Total energy of flow decreases in the direction of flow.
Reason (R): The specific energy may decrease, increase or remain constant.

Question 10

A horizontal venturimeter with inlet diameter of 30 cm and throat diameter of 15 cm is used to measure the flow of water. The reading on a differential manometer connected to the inlet and the throat is 20 cm of mercury. If Cd = 0.98, the rate of flow is nearly

Question 11

Two flows are specified as
A.

B.

Which one of the following can be concluded?

Question 12

If the stream functions

, what is the magnitude of velocity at point (2, 2)?

Question 13

Which one of the following gives the lift force F_L produced on a rotating circular cylinder per unit length in a uniform flow?

where,
u = free stream velocity

= circulation
p = density of the fluid

Question 14

Consider the following statements :
1) The phenomenon of lift produced by imposing circulation over a doublet in a uniform flow is known as Magnus effect.
2) The path deviation of a cricket ball from its original trajectory is due to the Magnus effect.
Which of these statements is/are correct?

Question 15

Consider the following with respect to the application of the Navier-Stokes equations:
1) Laminar flow in circular pipes
2) Laminar flow between concentric rotating cylinders
3) Laminar unidirectional flow between stationary parallel plates
4) Laminar unidirectional flow between parallel plates having relative motion
Which of these statements is/are correct?

Question 16

Couette flow is characterized by

Question 17

A hydraulically efficient trapezoidal section of open channel flow carries water at the optimal depth of 0.6 m. Chezy coefficient is 75 and bed slope is 1 in 250. What is the discharge through the channel?

Question 18

How is the best hydraulic channel cross-section defined?

Question 19

A circular plate 1.5m diameter is submerged in water with its greatest and least depths below the surface being 2m and 0.75m respectively. What is the total pressure (approximately) on one face of the plate?

Question 20

Assertion (A) : The center of pressure for a vertical surface submerged in a liquid lies above the centroid (centre of gravity) of the vertical surface
Reason (R) : The distance of the centre of pressure from the free surface of the liquid for vertical surface submerged in a liquid is independent of the density of the liquid.

Question 21

Match List-I with List-II and select the correct answer using the code given below the lists.

Question 22

Pseudo plastic is a fluid for which

Question 23

Which one of the following is measured by a rotameter?

Question 24

The Euler's equation of motion is a statement of

Question 25

For flow of the ideal fluid over a cylinder from the front stagnation point,

Question 26

In a fully developed region of the pipe flow,

Question 27

The pressure drop in a pipe flow is directly proportional to the mean velocity. It can be deduced that the

Question 28

Which among the following information is correct in case of a Bend?

Question 29

A venturimeter of 20 mm throat diameter is used to measure the velocity of water in a horizontal pipe of 40 mm diameter. If the pressure difference between the pipe and throat sections is found to be 30 kPa then, neglecting frictional losses, the flow velocity is

Question 30

For a fully developed flow or water in a pipe having diameter 10 cm, velocity 0.1 m/s and kinematic viscosity $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image146.png$ , the value of Darcy friction factor is ____