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4

A channel is said to be of most economical cross-section, if

A. It gives maximum discharge for a given cross-sectional area and bed slope

B. It has minimum wetted perimeter

C. It involves lesser excavation for the designed amount of discharge

D. All of the above

Correct Answer :

D. All of the above


Related Questions

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For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

A. Continuity equation

B. Bernoulli's equation

C. Pascal's law

D. Archimedess principle

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If the depth of water in an open channel is less than the critical depth, the flow is called

A. Critical flow

B. Turbulent flow

C. Tranquil flow

D. Torrential flow

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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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A thick liquid like syrup has a __________ viscosity than a light liquid like water.

A. Lesser

B. Greater

C. Same

D. None of these

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The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

A. Meta center

B. Center of pressure

C. Center of buoyancy

D. Center of gravity

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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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Bernoulli's equation is applied to

A. Venturimeter

B. Orifice meter

C. Pitot tube

D. All of these

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The viscosity of a liquid __________ its rate of flow through a hole in a vessel.

A. Effects

B. Does not effect

C. Both A and B

D. None of these

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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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A venturi-flume is used to measure

A. Pressure of liquid

B. Discharge of liquid

C. Pressure difference between two points in a channel

D. Pressure difference between two points in a pipe

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When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called

A. Gauge pressure

B. Absolute pressure

C. Positive gauge pressure

D. Vacuum pressure

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4

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

A. Double

B. Four times

C. Eight times

D. Sixteen times

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The line of action of the buoyant force acts through the

A. Centroid of the volume of fluid vertically above the body

B. Centre of the volume of floating body

C. Center of gravity of any submerged body

D. Centroid of the displaced volume of fluid

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4

Alcohol is used in manometers because

A. It has low vapour pressure

B. It is clearly visible

C. It has low surface tension

D. It can provide longer column due to low density

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Reynolds number is significant in

A. Supersonics, as with projectile 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 forces, and wave making effect, as with ship's hulls

D. All of the above

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A notch is used to measure __________ of liquids.

A. Pressure

B. Discharge

C. Velocity

D. Volume

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The difference of pressure between the inside and outside of a liquid drop is

A. p = T × r

B. p = T/r

C. p = T/2r

D. p = 2T/r

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4

A weir, generally, used as a spillway of a dam is

A. Narrow crested weir

B. Broad crested weir

C. Ogee weir

D. Submerged weir

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The hydraulic mean depth for a circular pipe of diameter (d) is

A. d/6

B. d/4

C. d/2

D. d

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When the Venturimeter is inclined, then for a given flow it will show __________ reading.

A. Same

B. More

C. Less

D. None of these

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A pitot tube is used to measure the

A. Velocity of flow at the required point in a pipe

B. Pressure difference between two points in a pipe

C. Total pressure of liquid flowing in a pipe

D. Discharge through a pipe

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Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure.

A. Plus

B. Minus

C. Divide

D. Multiply

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The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

A. Q = (2/3) Cd × b × √(2g) × (H2 - H1)

B. Q = (2/3) Cd × b × √(2g) × (H2 1/2 - H1 1/2)

C. Q = (2/3) Cd × b × √(2g) × (H2 3/2 - H1 3/2)

D. Q = (2/3) Cd × b × √(2g) × (H2 2 - H1 2)

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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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The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

A. (2/3) Cd × b × √(2gH)

B. (2/3) Cd × b × √(2g) × H

C. (2/3) Cd × b × √(2g) × H3/2

D. (2/3) Cd × b × √(2g) × H2

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4

When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

A. Centre of pressure

B. Centre of gravity

C. Centre of buoyancy

D. Metacentre

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In case of flow through parallel pipes,

A. The head loss for all the pipes is same

B. The total discharge is equal to the sum of discharges in the various pipes

C. The total head loss is the sum of head losses in the various pipes

D. Both (A) and (B)

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The horizontal component of buoyant force is

A. Negligible

B. Same as buoyant force

C. Zero

D. None of the above

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A flow is called hyper-sonic, if the Mach number is

A. Less than unity

B. Unity

C. Between 1 and 6

D. None of these

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The pressure of the liquid flowing through the divergent portion of a Venturimeter

A. Remains constant

B. Increases

C. Decreases

D. Depends upon mass of liquid