GATE (CE) 2021: FLUID MECHANICS QUIZ # 12 (App update required to attempt this test) for ESE & GATE CE Exams

Question 1

Euler’s Equation of motion

Question 2

A stream function is given by:

The flow rate across a line joining points A (0,5) and B (1,2) is

Question 3

Before passage of a surge, the depth and velocity of flow at a section are 1.8 m and 3.6 m/s. After the surge passage, they are 0.6 m and 8 m/s respectively. The speed of the surge is?

Question 4

A rectangular plate 1.2 x 3 m is immersed in a liquid of relative density 0.85 with its 1.2 m side horizontal and just at the water surface. If the plane of plate makes an angle of 50

with the horizontal, the pressure force on one side of the plate is

Question 5

Which of the following is not correct?

Question 6

On a plate

, where u is in m/sec & y is in m &

of fluid = 0.5 Ns/m². Shear stress at 0.4 m above plate and 0.3 m above plate are in ratio:

Question 7

A pressure gauge reads 62.3 kPa and 90 kPa respectively at heights of 7 m and 4 m fitted on the side of a tank filled with liquid. What is the approximate density of the liquid on kg/m³?

Question 8

Find the depth of centre of pressure if a rectangular plate of 12 m x 6 m is in water and surface of plate is 2 m below water surface. Width is 6 m.

Question 9

If velocity vector in a flow is given by:

Then equation of streamline is

Question 10

A laboratory model of a river is built to a geometric scale of 1:200. The fluid used in the model is oil of mass density 850 kg/m³. The highest flood in the river is 12000 m³/s. the corresponding discharge in the model shall be

Question 11

A stone weights 450 N in air and 250 N in water. The volume of the stone is:

Question 12

A penstock is 3000 meters long. Pressure wave travels in it with a velocity of 1500 m/s. If the turbine gates are closed uniformly and completely in a period of 4.5 seconds, then it is called

Question 13

A Cipolletti weir discharges water with the head of water over the crest being 20 cm. If the head due to velocity of approach is 0.02 m, what will be the excess percentage of flow, when corrected for velocity of approach as compared to when not corrected?

Question 14

A jet of water comes from a 5 cm diameter nozzle, held vertically upwards, at a velocity of 20 m/sec. If air resistance consumes 10% of the initial energy of the jet, then it would reach at a height, above the nozzle of? Report the answer in cm.

Question 15

A fluid jet discharging from a 4 cm diameter orifice has a diameter of 3 cm at its vena contracta. If the coefficient of velocity is 0.98, the coefficient of discharge for the orifice will be? Report the answer upto 2 decimal places.