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Fluid Mechanics Live Quiz Session Solution for GATE 2019
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Question 1
When a dolphin glides through air, it experiences an external pressure of 0.75 m of mercury. The absolute pressure on dolpin when it is 5 m below the free surface of the water is
Question 2
In figure, if the pressure of gas in bulb A is 50 cm Hg vacuum and patm = 76 cm Hg, the height of column H is equal to
Question 3
A large tank with a nozzle attached contains three immiscible, inviscid fluids as shown. Assuming that the changes in 
are negligible, the instantaneous discharge velocity is
are negligible, the instantaneous discharge velocity is Question 4
A rectangular plate of width b and a submerged depth H has its centre of gravity coinciding with level of water. For what value of b, the plate will be in a stable equilibrium? Consider H=
m.
m. Question 5
In a flow of an ideal fluid, for the two given points at the same horizontal level, the difference in the pressure is 100 times the specific weight of the fluid. If the ratio of velocities at the two point is 
and lower velocity is 10 m/s, then 
will be ____.
[Assume no losses]
and lower velocity is 10 m/s, then will be ____. [Assume no losses]
Question 6
A fluid having the viscosity of 0.048Pa-sec is flowing inside a glass-tube of diameter 10cm with a velocity of 40m/s, as observed at an instant t.At this instant, a drop of blue ink is injection in the tube. Then which of the following holds? 
Question 7
You are asked to evaluate assorted fluid flows for their suitability in a given laboratory application. The following three flow choices, expressed in terms of the two-dimensional velocity fields in the xy-plane, are made available.
P, u = 2y, v = -3x
Q, u = 3xy, v = 0
R, u = -2x, v = 2y
Which flow(s) should be recommended when the application requires the flow to be incompressible and irrotational?
P, u = 2y, v = -3x
Q, u = 3xy, v = 0
R, u = -2x, v = 2y
Which flow(s) should be recommended when the application requires the flow to be incompressible and irrotational?
Question 8
Water at 25 °C is flowing through a 1.0 km long C.I. pipe of 200 mm diameter at the rate of 0.07 m3/s. If value of Darcy friction factor for this pipe is 0.02 and density of water is 1000 kg/m3, the pumping power (in kW) required to maintain the flow is
Question 9
A centrifugal pump has an efficiency of 80%. The specifications of the pump are: discharge = 70m3/hr, Head = 7m, speed = 1450 rpm and diameter = 200mm. If the speed of this pump is increased to 1750 rpm, calculate the discharge, head developed and power input required at this speed without loss in efficiency.Density of water= 998 kg/m3.
Question 10
Water (p = 1000 kg/
) 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
) 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 - 1033 attempts
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Nov 9ESE & GATE ME
