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4

In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

A. Frictional force

B. Viscosity

C. Surface friction

D. All of the above

Correct Answer :

D. All of the above


Related Questions

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4

Bernoulli equation deals with the law of conservation of

A. Mass

B. Momentum

C. Energy

D. Work

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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 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

A large Reynold number is indication of

A. Smooth and streamline flow

B. Laminar flow

C. Steady flow

D. Highly turbulent flow

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4

The discharge through a siphon spillway is

A. Cd × a × √(2gH)

B. Cd × a × √(2g) × H3/2

C. Cd × a × √(2g) × H2

D. Cd × a × √(2g) × H5/2

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4

Pressure of the order of 10 torr can be measured by

A. Bourdon tube

B. Pirani Gauge

C. Micro-manometer

D. Lonisation gauge

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4

A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.

A. Incompressible

B. Compressible

C. Viscous

D. None of these

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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 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

Practical fluids

A. Are viscous

B. Possess surface tension

C. Are compressible

D. Possess all the above properties

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4

The atmospheric pressure with rise in altitude decreases

A. Linearly

B. First slowly and then steeply

C. First steeply and then gradually

D. Unpredictable

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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 length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

A. v₁²/2g

B. v₂²/2g

C. 0.5 v₁²/2g

D. 0.375 v₂²/2g

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4

Density of water is maximum at

A. 0° C

B. 0° K

C. 4° C

D. 100° C

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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

The discharge over a rectangular notch is

A. Inversely proportional to H3/2

B. Directly proportional to H3/2

C. Inversely proportional to H5/2

D. Directly proportional to H5/2

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4

The meatcentric height is the distance between the

A. Centre of gravity of the floating body and the centre of buoyancy

B. Centre of gravity of the floating body and the metacentre

C. Metacentre and centre of buoyancy

D. Original centre of buoyancy and new centre of buoyancy

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4

When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

A. 1.84 (L - 0.1nH)H3/2

B. 1.84 (L - nH)H2

C. 1.84 (L - 0.1nH)H5/2

D. 1.84 (L - nH)H3

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4

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

A. wH

B. wH/2

C. wH2/2

D. wH2/3

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4

In open channels, the specific energy is the

A. Total energy per unit discharge

B. Total energy measured with respect to the datum passing through the bottom of the channel

C. Total energy measured above the horizontal datum

D. Kinetic energy plotted above the free surface of water

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4

The density of water is 1000 kg/m3 at

A. 0° C

B. 0° K

C. 4° C

D. 20° C

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4

The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be

A. 500 kg

B. 1000 kg

C. 1500 kg

D. 2000 kg

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4

Falling drops of water become spheres due to the property of

A. Surface tension of water

B. Compressibility of water

C. Capillarity of water

D. Viscosity of water

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4

A one dimensional flow is one which

A. Is uniform flow

B. Is steady uniform flow

C. Takes place in straight lines

D. Involves zero transverse component of flow

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4

The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

A. w × Q × H

B. w × Q × hf

C. w × Q (H - hf)

D. w × Q (H + hf)

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4

The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe)

A. v²/2g

B. 0.5v²/2g

C. 0.375v²/2g

D. 0.75v²/2g

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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 bring the liquid level from H1 to H2 will be

A. 2A × √H₁/Cd × a × √(2g)

B. 2A × √H₂/Cd × a × √(2g)

C. 2A × (√H₁ - √H₂)/Cd × a × √(2g)

D. 2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

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4

The Reynold's number of a ship is __________ to its velocity and length.

A. Directly proportional

B. Inversely proportional

C. Square root of velocity

D. None of these

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4

In an immersed body, centre of pressure is

A. At the centre of gravity

B. Above the centre of gravity

C. Below be centre of gravity

D. Could be above or below e.g. depending on density of body and liquid

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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