Hydraulic and Fluid Mechanics

51. A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

1. Notch
2. Weir
3. Mouthpiece
4. Nozzle

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52. A pitot tube is used to measure the

1. Velocity of flow at the required point in a pipe
2. Pressure difference between two points in a pipe
3. Total pressure of liquid flowing in a pipe
4. Discharge through a pipe

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53. A point, in a compressible flow where the velocity of fluid is zero, is called

1. Critical point
2. Vena contracta
3. Stagnation point
4. None of these

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54. A pressure of 25 m of head of water is equal to

1. 25 kN/ m²
2. 245 kN/ m²
3. 2500 kN/m²
4. 2.5 kN/ m²

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55. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water?

1. 10 m/sec
2. 25 m/sec
3. 2 m/sec
4. 50 m/sec

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56. A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is

1. 9,000 kg
2. 13,500 kg
3. 18,000 kg
4. 27,000 kg

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57. A streamline is defined as the line

1. Parallel to central axis flow
2. Parallel to outer surface of pipe
3. Of equal velocity in a flow
4. Along which the pressure drop is uniform

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

1. Orifice
2. Notch
3. Weir
4. Dam

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59. A structure, whose width is

1. Less than
2. More than
3. Equal
4. None of these

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60. A submerged body is said to be in a stable equilibrium, if its centre of gravity

1. Coincides with
2. Lies below
3. Lies above
4. None of these

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