Fluid Mechanics

421.Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around

1. 2000
2. 10
3. 100
4. 1000

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422.Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will

1. Increase
2. Decrease
3. Remain same
4. Data insufficient to predict pressure drop

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423.Reynolds number is the ratio of

1. Viscous forces to gravity forces
2. Inertial forces to viscous forces
3. Viscous forces to inertial forces
4. Inertial forces to gravity forces

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424.Rise of liquid in a capillary tube is due to

1. Cohesion
2. Adhesion
3. Both (A) & (B)
4. Neither (A) nor (B)

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425.Rotary vacuum pumps can reduce the absolute pressure to as low as _________ mm Hg.

1. 1
2. 0.1
3. 0.01
4. 0.001

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426.Rubber latex is an example of _________ fluid.

1. Dilatants
2. Newtonian
3. Pseudo plastic
4. Bingham plastic

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427.Rubber latex is an example of a _________ fluid.

1. Pseudo plastic
2. Bingham plastic
3. Dilatent
4. Newtonian

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428.Scale up of agitator design requires

1. Geometrical similarity only
2. Dynamic similarity only
3. Both geometrical and dynamic similarity
4. All geometrical, dynamic and kinematic similarity

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429.Schedule number of a pipe, which is a measure of its wall thickness, is given by

1. 1000 P'/S
2. 100 P'/S
3. 1000 S/P'
4. 10000 P'/S

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430.Select the correct practical example of steady non-uniform flow.

1. Motion of water around a ship in a lake
2. Motion of river around bridge piers
3. Steadily decreasing flow through a reducing section
4. Steadily increasing flow through a pipe

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