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Norman Driver's Test > Principles of Pressure and Friction > Flashcards

Principles of Pressure and Friction Flashcards

1
Q

6th Principle of pressure

A

The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel.

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2
Q

1st Principle of pressure

A

Fluid pressure is perpendicular to any surface on which it acts.

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3
Q

2nd Principle of pressure

A

Fluid pressure at a point of rest is the same intensity in all directions.

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4
Q

The pressure of a liquid in an open vessel is proportional to the density of the liquid.

A

5th Principle of pressure

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5
Q

The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel.

A

6th Principle of pressure

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6
Q

5th Principle of pressure

A

The pressure of a liquid in an open vessel is proportional to the density of the liquid.

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7
Q

3rd Principle of pressure

A

Pressure applied to a confined fluid is transmitted equally in all directions.

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8
Q

Fluid pressure at a point of rest is the same intensity in all directions.

A

2nd Principle of pressure

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9
Q

4th Principle of pressure

A

The pressure of a liquid in an open vessel is proportional to its depth.

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10
Q

The pressure of a liquid in an open vessel is proportional to its depth.

A

4th Principle of pressure

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11
Q

Pressure applied to a confined fluid is transmitted equally in all directions.

A

3rd Principle of pressure

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12
Q

Fluid pressure is perpendicular to any surface on which it acts.

A

1st Principle of pressure

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13
Q

Types of pressure

A

Atmospheric Pressure, Head Pressure, Static Pressure, Normal operating pressure, Residual Pressure, Flow pressure (velocity pressure)

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14
Q

Atmospheric pressure

A

Pressure surrounding the earth that has depth and density. 14.7psi at sea level

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15
Q

Head Pressure

A

Height of water above discharge. 0.434 per ft elevation

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16
Q

Static Pressure

A

Stored potential energy available in a water system. At rest.

17
Q

If all other conditions remain the same, friction loss varies directly with the length of the hose. (Set gpm in one hose diameter the FL is proportional to the leght of the hose)

A

First Principle of Friction Loss

18
Q

When hoses are the same size, friciton loss varies approx. with the square of the increase in velocity of the flow. (Double flow/quadruple FL, Triple flow/9x FL)

A

Second principle fo Friciton Loss

19
Q

For the same discharge, friction loss varies inversely as the fifth power of the diameter of the hose.

2.5^5=97.66

3^5=243

97.66/243=0.4

Meaning for the same flow the 3” would have 60% less friction than the 2.5”

A

Third Principle of Friction loss

20
Q

For a given velocity, friction loss is approximately the same, regardless of the pressure on the water.

In other words a 1.75” flowing 150 gpm @ 100 psi and at 150psi will have the same FL

A

Fourth Principle of Friction loss.

Norman Driver's Test (8 decks)

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