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Current Affairs January 2024

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4

The hydraulic mean depth or the hydraulic radius is the ratio of

A. Area of flow and wetted perimeter

B. Wetted perimeter and diameter of pipe

C. Velocity of flow and area of flow

D. None of these

Correct Answer :

A. Area of flow and wetted perimeter


Related Questions

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4

The variation in the volume of a liquid with the variation of pressure is called its

A. Surface tension

B. Compressibility

C. Capillarity

D. Viscosity

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4

The units of kinematic viscosity are

A. Metres² per sec

B. kg sec/metre

C. Newton-sec per metre

D. Newton-sec per metre

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4

The top of the weir over which the water flows is known as

A. Sill or crest

B. Nappe or vein

C. Orifice

D. None of these

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4

The maximum efficiency of transmission through a pipe is

A. 50 %

B. 56.7 %

C. 66.67 %

D. 76.66 %

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4

Select the correct statement

A. Weber's number is the ratio of inertia force to elastic force.

B. Weber's number is the ratio of gravity force to surface tension force.

C. Weber's number is the ratio of viscous force to pressure force.

D. Weber's number is the ratio of inertia force to surface tension force.

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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

Steady flow occurs when

A. The direction and magnitude of the velocity at all points are identical

B. The velocity of successive fluid particles, at any point, is the same at successive periods of time

C. The magnitude and direction of the velocity do not change from point to point in the fluid

D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

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4

Flow occurring in a pipeline when a valve is being opened is

A. Steady

B. Unsteady

C. Laminar

D. Vortex

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4

A fluid in equilibrium can't sustain

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Bending stress

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4

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

A. Higher than the surface of liquid

B. The same as the surface of liquid

C. Lower than the surface of liquid

D. Unpredictable

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4

Which of the following is an example of laminar flow?

A. Underground flow

B. Flow past tiny bodies

C. Flow of oil in measuring instruments

D. All of these

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4

Practical fluids

A. Are viscous

B. Possess surface tension

C. Are compressible

D. Possess all the above properties

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4

The centre of gravity of the volume of the liquid displaced is called

A. Centre of pressure

B. Centre of buoyancy

C. Metacentre

D. None of these

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4

An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called

A. Weir

B. Notch

C. Orifice

D. None of these

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4

Fluid is a substance which offers no resistance to change of

A. Pressure

B. Flow

C. Shape

D. Volume

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4

The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm. The pressure at 2.5 m below the oil surface will be

A. 2 metres of water column

B. 3 metres of water column

C. 3.5 metres of water column

D. 4 m of water column

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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

The resultant upward pressure of the fluid on an immersed body is called

A. Up-thrust

B. Buoyancy

C. Center of pressure

D. All the above are correct

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4

Coefficient of resistance is the ratio of

A. Actual velocity of jet at vena-contracta to the theoretical velocity

B. Area of jet at vena-contracta to the area of orifice

C. Loss of head in the orifice to the head of water available at the exit of the orifice

D. Actual discharge through an orifice to the theoretical discharge

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4

Water is a __________ fluid.

A. Real

B. Ideal

C. Newtonian

D. Non-Newtonian

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4

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

A. Force of adhesion

B. Force of cohesion

C. Force of friction

D. Force of diffusion

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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

In a depressed nappe

A. The pressure below the nappe is atmospheric

B. The pressure below the nappe is negative

C. The pressure above the nappe is atmospheric

D. The pressure above the nappe is negative

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4

The pressure at a point 4 m below the free surface of water is

A. 19.24 kPa

B. 29.24 kPa

C. 39.24 kPa

D. 49.24 kPa

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4

The depth of the centre of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is

A. 2.4 m

B. 3.0 m

C. 4.0 m

D. 5.0 m

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4

The equation of continuity holds good when the flow

A. Is steady

B. Is one dimensional

C. Velocity is uniform at all the cross sections

D. All of the above

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4

True one-dimensional flow occurs when

A. The direction and magnitude of the velocity at all points are identical

B. The velocity of successive fluid particles, at any point, is the same at successive periods of time

C. The magnitude and direction of the velocity do not change from point to point in the fluid

D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

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4

Ratio of inertia force to elastic force is known as

A. Mach number

B. Froude number

C. Reynolds number

D. Weber's number

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4

According to Bernoulli's equation for steady ideal fluid flow

A. Principle of conservation of mass holds

B. Velocity and pressure are inversely proportional

C. Total energy is constant throughout

D. The energy is constant along a streamline but may vary across streamlines

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4

A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

A. (2A√H₁)/(Cd × a√2g)

B. (2AH₁)/(Cd × a√2g)

C. (2AH₁3/2)/(Cd × a√2g)

D. (2AH₁²)/(Cd × a√2g)