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4

The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.

A. One-half

B. One-third

C. Two-third

D. None of these

Correct Answer :

B. One-third


Related Questions

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4

The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

A. ρ ω2 r2

B. 2ρ ω2 r2

C. ρ ω2 r2/2

D. ρ ω2 r2/4

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4

Falling drops of water become spheres due to the property of

A. Adhesion

B. Cohesion

C. Surface tension

D. Viscosity

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4

A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A. Equal to

B. Less than

C. More than

D. None of these

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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 bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

A. Increase

B. Decrease

C. Remain same

D. Increase/decrease depending on depth of immersion

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4

The time oscillation of a floating body with increase in meatcentric height will be

A. Same

B. Higher

C. Lower

D. Lower/higher depending on weight of body

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4

To avoid an interruption in the flow of a siphon, an air vessel is provided

A. At the inlet

B. At the outlet

C. At the summit

D. At any point between inlet and outlet

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4

The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)

A. 4μvl/wd²

B. 8μvl/wd²

C. 16μvl/wd²

D. 32μvl/wd²

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Uniform flow occurs when

A. The flow is steady

B. The flow is streamline

C. Size and shape of the cross section in a particular length remain constant

D. Size and cross section change uniformly along length

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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 torque required to overcome viscous resistance of a collar bearing is (where R1 andR2 = External and internal radius of collar)

A. (μπ²N/60t) × (R₁ - R₂)

B. (μπ²N/60t) × (R₁² - R₂²)

C. (μπ²N/60t) × (R₁³ - R₂³)

D. (μπ²N/60t) × (R₁⁴ - R₂⁴)

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4

The ratio of the inertia force to the viscous force is called

A. Reynold's number

B. Froude's number

C. Weber's number

D. Euler's number

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4

The pressure measured with the help of a Piezometer tube is in

A. N/mm2

B. N/m2

C. Head of liquid

D. All of these

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4

The ratio of the inertia force to the elastic force is called

A. Reynold's number

B. Froude's number

C. Weber's number

D. Mach number

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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

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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Euler's number is the ratio of __________ force to pressure force.

A. Inertia

B. Gravity

C. Viscous

D. None of these

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4

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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4

A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

A. 400 kg/cm²

B. 4000 kg/cm²

C. 40 × 10⁵ kg/cm²

D. 40 × 10⁶ kg/cm²

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4

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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4

A differential manometer is used to measure

A. Atmospheric pressure

B. Pressure in pipes and channels

C. Pressure in Venturimeter

D. Difference of pressures between two points in a pipe

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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

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 unit of surface tension is

A. N/m

B. N/m2

C. N/m3

D. N-m

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4

The magnitude of water hammer depends upon the

A. Elastic properties of the pipe material

B. Elastic properties of the liquid flowing through the pipe

C. Speed at which the valve is closed

D. All of the above

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4

The dynamic viscosity of gases __________ with rise in temperature.

A. Remain unaffected

B. Increases

C. Decreases

D. None of these

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4

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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4

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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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 center of pressure of a surface subjected to fluid pressure is the point

A. On the surface at which resultant pressure acts

B. On the surface at which gravitational force acts

C. At which all hydraulic forces meet

D. Similar to metacentre