Fluid Mechanics

61.A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?

1. Inertial and drag forces are important
2. Drag, gravitational and buoyancy forces are important
3. Drag force and gravitational forces are important
4. None of the above

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62.A stream line is

1. Fixed in space in steady flow
2. Always the path of particle
3. Drawn normal to the velocity vector at every point
4. A line connecting the mid points of flow cross-section

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63.A stream tube is that, which has _________ cross-section entirely bounded by stream lines.

1. A circular
2. Any convenient
3. A small
4. A large

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64.A streamline is

1. The line connecting the mid-points of flow cross-sections
2. Defined for uniform flow only
3. Drawn normal to the velocity vector at every point
4. Always the path of a particle

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65.A streamline is a line in flow field,

1. That is traced by all the fluid particles passing through a given point
2. Along which a fluid particle travels
3. Such that at every point on it, the velocity is tangential to it
4. None of these

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66.A tube is specified by its

1. Thickness only
2. Outer diameter only
3. Thickness & outer diameter both
4. Inner diameter

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67.A Venturimeter cannot be used for the direct measurement of

1. Datum difference in the stretch of pipe-flow
2. Pressure difference in the flow through pipeline
3. Friction loss in pipe flow
4. All (A), (B) and (C)

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68.A Venturimeter measures the

1. Velocity head
2. Pressure
3. Point velocity
4. None of these

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69.A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of _________ shape.

1. Circular
2. Rectangular
3. Triangular
4. Trapezoidal

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70.Absolute viscosity of a fluid is a function of the _________ of the fluid.

1. Motion
2. Pressure & temperature
3. Shearing stress
4. Both (B) & (C)

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