Hydraulic and Fluid Mechanics

141. For measuring flow by a Venturimeter, if should be installed in

1. Vertical line
2. Horizontal line
3. Inclined line with flow downward
4. In any direction and in any location

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142. For pipes, laminar flow occurs when Reynolds number is

1. Less than 2000
2. Between 2000 and 4000
3. More than 4000
4. Less than 4000

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143. For pipes, turbulent flow occurs when Reynolds number is

1. Less than 2000
2. Between 2000 and 4000
3. More than 4000
4. Less than 4000

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144. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

1. Ratio of inertial force to force due to viscosity
2. Ratio of inertial force to force due to surface tension
3. Ratio of inertial force to force due to surface tension
4. All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

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145. For very great pressures, viscosity of moss gases and liquids

1. Remain same
2. Increases
3. Decreases
4. Shows erratic behaviour

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146. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

1. Force of adhesion
2. Force of cohesion
3. Force of friction
4. Force of diffusion

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147. Free surface of a liquid tends to contract to the smallest possible area due to force of

1. Surface tension
2. Viscosity
3. Friction
4. Cohesion

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148. Froude number is significant in

1. Supersonics, as with projectile and jet propulsion
2. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
3. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
4. All of the above

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149. Froude's number is the ratio of inertia force to

1. Pressure force
2. Elastic force
3. Gravity force
4. Surface tension force

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150. Gauge pressure at a point is equal to the absolute pressure

1. Plus
2. Minus
3. Divide
4. Multiply

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