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4

When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

A. Steady flow

B. Turbulent flow

C. Vortex flow

D. Uniform flow

Correct Answer :

C. Vortex flow


Related Questions

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4

The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

A. wA

B. wx

C. wAx

D. wA/x

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4

The tangential velocity of the water element having a free vortex is

A. Directly proportional to its distance from the centre

B. Inversely proportional to its distance from the centre

C. Directly proportional to its (distance)2 from the centre

D. Inversely proportional to its (distance)2 from the centre

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4

The discharge through a channel of rectangular section will be maximum, if

A. Its depth is twice the breadth

B. Its breadth is twice the depth

C. Its depth is thrice the breadth

D. Its breadth is thrice the depth

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4

A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is

A. 9,000 kg

B. 13,500 kg

C. 18,000 kg

D. 27,000 kg

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4

The pressure of air __________ with the increase of height from the surface of the earth.

A. Does not change

B. Decreases

C. Increases

D. None of these

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4

An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.

A. 1 %

B. 1.5 %

C. 2 %

D. 2.5 %

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4

Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?

A. Venturimeter

B. Orifice plate

C. Hot wire anemometer

D. Pitot tube

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4

Select the wrong statement

A. An equivalent pipe is treated as an ordinary pipe for all calculations

B. The length of an equivalent pipe is equal to that of a compound pipe

C. The discharge through an equivalent pipe is equal to that of a compound pipe

D. The diameter of an equivalent pipe is equal to that of a compound pipe

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4

A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

A. Pascal's law

B. Archimedess principle

C. D-Alembert's principle

D. None of these

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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

The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

A. Surface tension

B. Compressibility

C. Capillarity

D. Viscosity

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4

A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called

A. Steady flow

B. Uniform flow

C. Streamline flow

D. Turbulent flow

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4

A fluid is said to be ideal, if it is

A. Incompressible

B. Viscous and incompressible

C. Inviscous and compressible

D. Inviscous and incompressible

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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

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4

The specific weight of water in S.I. units is taken as

A. 9.81 kN/m3

B. 9.81 × 103 N/m3

C. 9.81 × 10-6 N/mm3

D. Any one of these

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4

The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

A. dQ/Q = (1/2) × (dH/H)

B. dQ/Q = (3/4) × (dH/H)

C. dQ/Q = (dH/H)

D. dQ/Q = (3/2) × (dH/H)

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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 critical depth meter is used to measure

A. Velocity of flow in an open channel

B. Depth of flow in an open channel

C. Hydraulic jump

D. Depth of channel

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4

The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

A. Equal to

B. Less than

C. More than

D. None of these

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4

A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

A. 3.53 kN

B. 33.3 kN

C. 35.3 kN

D. None of these

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4

Metacentre is the point of intersection of

A. Vertical upward force through e.g. of body and center line of body

B. Buoyant force and the center line of body

C. Midpoint between e.g. and center of buoyancy

D. All of the above

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4

The pressure of liquid at throat in a Venturimeter is __________ than that at inlet.

A. Higher

B. Lower

C. Same

D. None of these

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4

All the terms of energy in Bernoulli's equation have dimension of

A. Energy

B. Work

C. Mass

D. Length

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4

Mach number is significant in

A. Supersonics, as with projectiles and jet propulsion

B. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls

D. All of the above

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4

The force per unit length is the unit of

A. Surface tension

B. Compressibility

C. Capillarity

D. Viscosity

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4

According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)

A. A × √(m × i)

B. C × √(m × i)

C. AC × √(m × i)

D. mi × √(A × C)

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4

Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be

A. 1000 kg

B. 4000 kg

C. 2000 kg

D. 8000 kg

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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

A fluid in equilibrium can't sustain

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Bending stress

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4

A flow through an expanding tube at constant rate is called

A. Steady uniform flow

B. Steady non-uniform flow

C. Unsteady uniform flow

D. Unsteady non-uniform flow