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4

In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

A. Less than

B. More than

C. Equal to

D. None of these

Correct Answer :

A. Less than


Related Questions

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Pitot tube is used for measurement of

A. Pressure

B. Flow

C. Velocity

D. Discharge

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4

Liquids transmit pressure equally in all the directions. This is according to

A. Boyle's law

B. Archimedes principle

C. Pascal's law

D. Newton's formula

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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

A nozzle placed at the end of a water pipe line discharges water at a

A. Low pressure

B. High pressure

C. Low velocity

D. High velocity

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A metal with specific gravity of a floating in a fluid of same specific gravity a will

A. Sink to bottom

B. Float over fluid

C. Partly immersed

D. Be fully immersed with top surface at fluid surface

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4

The length of the divergent cone in a Venturimeter is __________ that of the convergent cone.

A. Equal to

B. Double

C. Three to four times

D. Five to six times

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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 structure used to dam up a stream or river over which the water flows is called

A. Orifice

B. Notch

C. Weir

D. Dam

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An ideal flow of any fluid must satisfy

A. Pascal law

B. Newton's law of viscosity

C. Boundary layer theory

D. Continuity equation

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A fluid having no viscosity is known as

A. Real fluid

B. Ideal fluid

C. Newtonian fluid

D. Non-Newtonian fluid

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4

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm, the pressure at a depth of 50 m below the oil surface will be

A. 2 meters of water column

B. 3 meters of water column

C. 5 meters of water column

D. 6 meters of water Column

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4

Euler's equation in the differential form for the motion of liquids is given by

A. dp/ρ + g.dz + v.dv = 0

B. dp/ρ - g.dz + v.dv = 0

C. ρ.dp + g.dz + v.dv = 0

D. ρ.dp - g.dz + v.dv = 0

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4

An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is

A. 10 m/sec²

B. 9.81 m/sec²

C. 9.75 m/sec²

D. 9 m/sec

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4

The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

A. Q = Cd × bH₁ × √(2gh)

B. Q = Cd × bH2 × √(2gh)

C. Q = Cd × b (H2 - H1) × √(2gh)

D. Q = Cd × bH × √(2gh)

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4

Choose the wrong statement

A. Fluids are capable of flowing

B. Fluids conform to the shape of the containing vessels

C. When in equilibrium, fluids cannot sustain tangential forces

D. When in equilibrium, fluids can sustain shear forces

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4

The flow in a pipe is turbulent when Reynold number is

A. Less than 2000

B. Between 2000 and 2800

C. More than 2800

D. None of these

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4

When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure

A. Varies as the square of the radial distance

B. Increases linearly as its radial distance

C. Increases as the square of the radial distance

D. Decreases as the square of the radial distance

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4

Choose the wrong statement. Alcohol is used in manometer, because

A. Its vapour pressure is low

B. It provides suitable meniscus for the inclined tube

C. Its density is less

D. It provides longer length for a given pressure difference

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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

According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.

A. Equal to

B. Directly proportional

C. Inversely proportional

D. None of these

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4

Barometer is used to measure

A. Pressure in pipes, channels etc.

B. Atmospheric pressure

C. Very low pressure

D. Difference of pressure between two points

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4

The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

A. Q = Cd × a × 2gh

B. Q = (2/3). Cd × a × h

C. Q = (Cd × a)/√(2gh)

D. Q = (3Cd × a)/√(2h)

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4

A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

A. (bd²/12) + x

B. (d²/12 x) + x

C. b²/12 + x

D. d²/12 + x

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4

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?

A. 0.5

B. 0.4

C. 0.515

D. 0.5

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4

The specific gravity of an oil whose specific weight is 7.85 kN/m3, is

A. 0.8

B. 1

C. 1.2

D. 1.6

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4

The coefficient of discharge for an external mouthpiece depends upon

A. Velocity of liquid

B. Pressure of liquid

C. Area of mouthpiece

D. Length of mouthpiece

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4

When a body floating in a liquid, is displaced slightly, it oscillates about

A. C.G. of body

B. Center of pressure

C. Center of buoyancy

D. Metacentre

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4

The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

A. μ π³ N² R² /1800 t

B. μ π³ N² R⁴ /1800 t

C. μ π³ N² R² /3600 t

D. μ π³ N² R⁴ /3600 t

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4

The discharge in an open channel corresponding to critical depth is

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)

A. K.ρ

B. K/ρ

C. ρ/K

D. None of these