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When a block of ice floating on water in a container melts, the level of water in the container
When a ship enters sea from a river one can expect it
The time of oscillation of a floating body is given by
Where
K = Radius of Gyration of the floating body about its centre of gravity
h = Metacentric height of the floating body
A cylindrical body of crosssectional area A height H and density ρ_{s} is immersed to a depth h in a liquid of density ρ and tied down to bottom with a string then the tension in the string is
There is no geometrical distinction between the streamline, pathline and streakline in case of
Stream line, path line and streak line are identical when the
Match List I with List II and select the correct answer using the codes given below the lists:
Under which of the following conditions will the equation = constant, will be valid in the whole flow field ?
1. Flow is rotational
2. Flow is irrotational
3. Flow is incompressible
4. Flow is steady
5. Flow is laminar
Venturimeter consists of following parts :
1. Diverging part
2. Throat
3. Main inlet pipe
4. Short converging part
Select the correct sequence of parts:
The range for coefficient of discharge (C_{d}) for a venturimeter is
In the siphon in figure below assuming ideal flow, the pressure P_{B}
As P_{A} = P_{C }both have atmospheric pressure and keeping other factors of energy constant, as liquid is flowing from B to C, P_{B}<P_{C}
Hence P_{B}<P_{A}
An oil of kinematic viscosity 0.5 stokes flows through a pipe of 4 cm diameter. The flow is critical at a velocity of about
In the NavierStokes equations, the forces considered are
NavierStoke's equation represents the conservation of
The NavierStokes equations represent the conservation of momentum, while the continuity equation represents the conservation of mass.
For laminar flow between two fixed parallel plates, the flow velocity
Correct Answer : b
Explanation : Laminar flow, type of fluid (gas or liquid) flow in which the fluid travels smoothly or in regular paths, in contrast to turbulent flow, in which the fluid undergoes irregular fluctuations and mixing. ... The fluid in contact with the horizontal surface is stationary, but all the other layers slide over each other.
The velocity profile is a parabola.
Capillary tube viscometers used for measurement of viscosity are based on
The kinematic viscosity of oil of specific gravity .8 is .0005 .This oil is used for lubrication of shaft of diameter .4 m and rotates at 190 rpm. Calculate the power lost in the bearing for a sleeve length of 90mm. The thickness of the oil film is 1.5mm.
Power lost= torque * angular velocity
= force* radius* angular velocity
= shear stress * area* radius* angular velocity
Shear Stress = viscosity* velocity gradient
Power lost= 0.0005*0.8*1000* 2*3.142*190/60*0.2*3.142*0.23 * 190/60
= 477.65 Watts.
Pressure drop in a 100 mm diameter horizontal pipe is 50 kPa over a length of 10 m. The shear stress at the pipe wall is
The pressure drop for a relatively low Reynolds number flow in a 600 mm, 30 m long pipe line is 70 kPa. What is the wall shear stress?
Use,
The body whose surface does not coincide with the streamline when places in a flow is called as
The head loss in a sudden expansion from 4 cm diameter pipe to 6 cm diameter pipe in terms of velocity V1 in the smaller diameter pipe is:
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