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4

Reynold's number is the ratio of inertia force to

A. Pressure force

B. Elastic force

C. Gravity force

D. Viscous force

Correct Answer :

D. Viscous force


Related Questions

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4

The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)

A. (2/3) Cd × L.√2g [H1 - Ha]

B. (2/3) Cd × L. √2g [H1 3/2 - Ha 3/2]

C. (2/3) Cd × L.√2g [H1 2 - Ha 2]

D. (2/3) Cd × L. √2g [H1 5/2 - Ha 5/2]

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4

For a body floating in a liquid the normal pressure exerted by the liquid acts at

A. Bottom surface of the body

B. C.G. of the body

C. Metacentre

D. All points on the surface of the body

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4

The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.

A. Decreases

B. Increases

C. Remain same

D. None of these

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4

The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)

A. (H - hf )/H

B. H/(H - hf )

C. (H + hf )/H

D. H/(H + hf )

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4

The normal stress is same in all directions at a point in a fluid

A. Only when the fluid is frictionless

B. Only when the fluid is incompressible and has zero viscosity

C. When there is no motion of one fluid layer relative to an adjacent layer

D. Irrespective of the motion of one fluid layer relative to an adjacent layer

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4

Cavitation will begin when

A. The pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

B. Pressure becomes more than critical pressure

C. Flow is increased

D. Pressure is increased

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4

The volumetric change of the fluid caused by a resistance is known as

A. Volumetric strain

B. Volumetric index

C. Compressibility

D. Adhesion

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4

A flow through a long pipe at decreasing rate is called __________ uniform flow.

A. Steady

B. Unsteady

C. Both A and B

D. None of these

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4

The Euler's equation for the motion of liquids is based upon the assumption that

A. The fluid is non - viscous, homogeneous and incompressible

B. The velocity of flow is uniform over the section

C. The flow is continuous, steady and along the stream line

D. All of the above

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4

In a forced vortex, the velocity of flow everywhere within the fluid is

A. Maximum

B. Minimum

C. Zero

D. Nonzero finite

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4

The tendency of a liquid surface to contract is due to the following property

A. Cohesion

B. Adhesion

C. Viscosity

D. Surface tension

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4

The magnitude of water hammer depends upon the

A. Elastic properties of the pipe material

B. Elastic properties of the liquid flowing through the pipe

C. Speed at which the valve is closed

D. All of the above

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4

Dynamic viscosity of most of the liquids with rise in temperature

A. Increases

B. Decreases

C. Remain unaffected

D. Unpredictable

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4

The liquid used in manometers should have

A. Low density

B. High density

C. Low surface tension

D. High surface tension

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4

If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

A. h

B. wh

C. w/h

D. h/w

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4

According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

A. flv²/2gd

B. flv²/gd

C. 3flv²/2gd

D. 4flv²/2gd

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4

The length of the divergent cone in a Venturimeter is __________ that of the convergent cone.

A. Equal to

B. Double

C. Three to four times

D. Five to six times

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4

The total energy of a liquid particle in motion is equal to

A. Pressure energy + kinetic energy + potential energy

B. Pressure energy - (kinetic energy + potential energy)

C. Potential energy - (pressure energy + kinetic energy

D. Kinetic energy - (pressure energy + potential energy)

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4

The product of mass and acceleration of flowing liquid is called

A. Inertia force

B. Viscous force

C. Gravity force

D. Pressure force

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4

The coefficient of discharge for an external mouthpiece depends upon

A. Velocity of liquid

B. Pressure of liquid

C. Area of mouthpiece

D. Length of mouthpiece

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4

Normal depth in open channel flow is the depth of flow corresponding to

A. Steady flow

B. Unsteady flow

C. Laminar flow

D. Uniform flow

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4

The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

A. 2100

B. 2700

C. 10,000

D. 21,000

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4

When the flow parameters at any given instant remain same at every point, then flow is said to be

A. Quasi-static

B. Steady state

C. Laminar

D. Uniform

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4

Barometer is used to measure

A. Pressure in pipes, channels etc.

B. Atmospheric pressure

C. Very low pressure

D. Difference of pressure between two points

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4

The force of buoyancy is always __________ the weight of the liquid displaced by the body.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

A. Newton's law of motion

B. Newton's law of cooling

C. Newton's law of viscosity

D. Newton's law of resistance

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4

A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

A. 0.83

B. 0.6

C. 0.4

D. 0.3

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4

The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is

A. 200 kg/m3

B. 400 kg/m3

C. 600 kg/m3

D. 800 kg/m3

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4

An orifice is said to be large, if

A. The size of orifice is large

B. The velocity of flow is large

C. The available head of liquid is more than 5 times the height of orifice

D. The available head of liquid is less than 5 times the height of orifice

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4

Center of pressure compared to e.g. is

A. Above it

B. Below it

C. At same point

D. Above or below depending on area of body