Fluid Mechanics

491.The equivalent diameter for flow through a rectangular duct of width B and height H is

1. HB/2 (H + B)
2. HB/(H + B)
3. 2HB/(H + B)
4. 4HB/(H + B)

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492.The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by

1. 4x
2. 2x
3. x
4. √x

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493.The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct).

1. x
2. √(πx)
3. √(2x)
4. √(x/2)

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494.The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by

1. 2xy/(x + y)
2. xy/(x + y)
3. (x + y)/2xy
4. (x + y)/xy

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495.The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the

1. Static submergence
2. Net positive suction head (NPSH)
3. Cavitation sensitivity
4. Priming

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496.The exit cone angle in case of a standard Venturimeter is _________ the entrance cone angle.

1. Smaller than
2. Greater than
3. Equal to
4. Either (A) or (B)

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497.The flow of a liquid through tapering pipe at a constant rate is an example of _________ flow.

1. Steady uniform
2. Steady non uniform
3. Unsteady uniform
4. Unsteady non uniform

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498.The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its

1. Viscosity
2. Specific volume
3. Velocity
4. None of these

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499.The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _________ fluid.

1. Bingham
2. Newtonian
3. Perfect
4. None of these

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500.The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its venacontracta. The co-efficient of contraction is

1. 1.3
2. 0.766
3. 0.87
4. None of these

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