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4

To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

A. 2.4 m above the hydraulic gradient

B. 6.4 m above the hydraulic gradient

C. 10.0 m above the hydraulic gradient

D. 5.0 above the hydraulic gradient

Correct Answer :

B. 6.4 m above the hydraulic gradient


Related Questions

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4

A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

A. 4wd/σ cosα

B. σ cosα/4wd

C. 4σ cosα/wd

D. wd/4σ cosα

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4

A flow through a long pipe at constant rate is called

A. Steady uniform flow

B. Steady non-uniform flow

C. Unsteady uniform flow

D. Unsteady non-uniform flow

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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 unit of viscosity is

A. Metres² per sec

B. kg-sec/metre

C. Newton-sec per metre²

D. Newton-sec per meter

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4

A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

A. 2.89 kN

B. 8.29 kN

C. 9.28 kN

D. 28.9 kN

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4

An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

A. Equal to

B. Directly proportional

C. Inversely proportional

D. None of these

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4

Viscosity of water in comparison to mercury is

A. Higher

B. Lower

C. Same

D. Higher/lower depending on temperature

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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

When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

A. Remains horizontal

B. Becomes curved

C. Falls on the front end

D. Falls on the back end

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4

The surface tension of mercury at normal temperature compared to that of water is

A. More

B. Less

C. Same

D. More or less depending on size of glass tube

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4

The pressure of fluid due to hammer blow is

A. Directly proportional to density of fluid

B. Inversely proportional to density of fluid

C. Directly proportional to (density)1/2 of fluid

D. Inversely proportional to (density)1/2 of fluid

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4

The hammer blow in pipes occurs when

A. There is excessive leakage in the pipe

B. The pipe bursts under high pressure of fluid

C. The flow of fluid through the pipe is suddenly brought to rest by closing of the valve

D. The flow of fluid through the pipe is gradually brought to rest by closing of the valve

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4

A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

A. 0.46

B. 0.64

C. 0.78

D. 0.87

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4

The stress-strain relation of the Newtonian fluid is

A. Linear

B. Parabolic

C. Hyperbolic

D. Inverse type

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4

The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

A. (8/15) Cd. 2g. H

B. (8/15) Cd. 2g. H3/2

C. (8/15) Cd. 2g. H²

D. (8/15) Cd. 2g. H5/2

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4

A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

A. It is easier to see through the glass tube

B. Glass tube is cheaper than a metallic tube

C. It is not possible to conduct this experiment with any other tube

D. All of the above

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4

The vapour pressure over the concave surface is

A. Less man the vapour pressure over the plane surface

B. Equal to the vapour pressure over the plane surface

C. Greater than the vapour pressure over the plane surface

D. Zero

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4

The pressure measured with the help of a pressure gauge is called

A. Atmospheric pressure

B. Gauge pressure

C. Absolute pressure

D. Mean pressure

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4

In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

A. Running full

B. Running free

C. Partially running full

D. Partially running free

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4

A fluid having no viscosity is known as

A. Real fluid

B. Ideal fluid

C. Newtonian fluid

D. Non-Newtonian fluid

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4

The divergent portion of a Venturimeter is made longer than convergent portion in order to

A. Avoid the tendency of breaking away the stream of liquid

B. To minimise frictional losses

C. Both (A) and (B)

D. None of these

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4

If the coefficient of discharge is 0.6, then the discharge over a right angled notch is

A. 0.417 H5/2

B. 1.417 H5/2

C. 4.171 H5/2

D. 7.141 H5/2

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4

Choose the wrong statement

A. The center of buoyancy is located at the center of gravity of the displaced liquid

B. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

C. If C.G. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

D. All floating bodies are stable

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4

Bulk modulus of a fluid __________ as the pressure increases.

A. Remain same

B. Decreases

C. Increases

D. None of these

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4

In one dimensional flow, the flow

A. Is steady and uniform

B. Takes place in straight line

C. Takes place in curve

D. Takes place in one direction

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4

The mass per unit volume of a liquid at a standard temperature and pressure is called

A. Specific weight

B. Mass density

C. Specific gravity

D. None of these

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4

Rain drops are spherical because of

A. Viscosity

B. Air resistance

C. Surface tension forces

D. Atmospheric pressure

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4

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

A. One dimensional flow

B. Streamline flow

C. Steady flow

D. Turbulent flow

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4

The intensity of pressure on an immersed surface __________ with the increase in depth.

A. Does not change

B. Increases

C. Decreases

D. None of these

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4

The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

A. 0.855 a.√(2gH)

B. 1.855 aH.√(2g)

C. 1.585 a.√(2gH)

D. 5.85 aH.√(2g)