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4

The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

A. 0.34 times

B. 0.67 times

C. 0.81 times

D. 0.95 times

Correct Answer :

C. 0.81 times


Related Questions

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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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The shear stress-strain graph for a Newtonian fluid is a

A. Straight line

B. Parabolic curve

C. Hyperbolic curve

D. Elliptical

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Which of the following statement is correct?

A. In a compressible flow, the volume of the flowing liquid changes during the flow

B. A flow, in which the volume of the flowing liquid does not change, is called incompressible flow

C. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow

D. All of the above

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If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

A. Specific weight

B. Specific mass

C. Specific gravity

D. Specific density

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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

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4

When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

A. Narrow-crested weir

B. Broad-crested weir

C. Ogee weir

D. Submerged weir

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4

Differential manometer 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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True one-dimensional 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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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 discharge through a channel of trapezoidal section is maximum when

A. Width of channel at the top is equal to twice the width at the bottom

B. Depth of channel is equal to the width at the bottom

C. The sloping side is equal to half the width at the top

D. The sloping side is equal to the width at the bottom

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Dynamic viscosity of most of the gases with rise in temperature

A. Increases

B. Decreases

C. Remain unaffected

D. Unpredictable

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The specific gravity of water is taken as

A. 0.001

B. 0.01

C. 0.1

D. 1

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Bernoulli equation deals with the law of conservation of

A. Mass

B. Momentum

C. Energy

D. Work

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The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.

A. Less than

B. More than

C. Equal to

D. None of these

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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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4

Re-entrant or Borda's mouthpiece is an __________ mouthpiece.

A. Internal

B. External

C. Both A and B

D. None of these

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The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

A. The bodies A and B have equal stability

B. The body A is more stable than body B

C. The body B is more stable than body A

D. The bodies A and B are unstable

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Water is __________ liquid.

A. A compressible

B. An incompressible

C. Both A and B

D. None of these

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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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A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

A. 2.89 kN

B. 8.29 kN

C. 9.28 kN

D. 28.9 kN

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A fluid which obeys the Newton's law of viscosity is termed as

A. Real fluid

B. Ideal fluid

C. Newtonian fluid

D. Non-Newtonian fluid

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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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The continuity equation is connected with

A. Open channel/pipe flow

B. Compressibility of fluids

C. Conservation of mass

D. Steady/unsteady flow

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The Newton's law of resistance is based on the assumption that the

A. Planes of the body are completely smooth

B. Space around the body is completely filled with the fluid

C. Fluid particles do not exert any influence on one another

D. All of the above

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The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to

A. Buoyancy

B. Equilibrium of a floating body

C. Archimedes' principle

D. Bernoulli's theorem

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For manometer, a better liquid combination is one having

A. Higher surface tension

B. Lower surface tension

C. Surface tension is no criterion

D. High density and viscosity

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One cubic metre of water weighs

A. 100 litres

B. 250 litres

C. 500 litres

D. 1000 litres

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

A. Remains constant

B. Increases

C. Decreases

D. Depends upon mass of liquid

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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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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