Hydraulic and Fluid Mechanics

171. In a forced vortex, the velocity of flow everywhere within the fluid is

1. Maximum
2. Minimum
3. Zero
4. Nonzero finite

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172. In a free nappe,

1. The pressure below the nappe is atmospheric
2. The pressure below the nappe is negative
3. The pressure above the nappe is atmospheric
4. The pressure above the nappe is negative

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173. In a free vortex motion, the radial component of velocity everywhere is

1. Maximum
2. Minimum
3. Zero
4. Nonzero and finite

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174. In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α=Inclination of the gate with the normal to the side of the lock)

1. p/sinα
2. 2p/sinα
3. p/2sinα
4. 2p/sin (α/2)

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175. In a short cylindrical external mouthpiece, the vena contracta occurs at a distance

1. Equal to
2. One-fourth
3. One-third
4. One-half

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176. In a static fluid

1. Resistance to shear stress is small
2. Fluid pressure is zero
3. Linear deformation is small
4. Only normal stresses can exist

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177. In a venturi-flume, the flow takes place at

1. Atmospheric pressure
2. Gauge pressure
3. Absolute pressure
4. None of these

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178. In an external mouthpiece, the absolute pressure head at vena contracta is

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

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179. In an immersed body, centre of pressure is

1. B and D
2. At the centre of gravity
3. Below be centre of gravity
4. Could be above or below e.g. depending on density of body and liquid

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180. In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

1. Running full
2. Running free
3. Partially running full
4. Partially running free

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