Week 2 Quiz Fluid Power

Question 1

What is the formula for force?

Answer 1

F=PxA
(Force=PressurexArea)

Question 2

What is the formula for the area of a circle?

Answer 2

A=.7854xD²

Question 3

What is the formula for Pressure?

Answer 3

P=F/A

Question 4

What is the formula for Area (When you have a Force and Pressure)?

Answer 4

A=F/P

Question 5

What dictates the pressure of a liquid?

Answer 5

The height.

Question 6

What is the formula for calculating the pressure of a fluid using the height/depth? (Formula will be given on quiz)

Answer 6

Pfluid= .433 x Specific Gravity of fluid x height of the fluid (Will be given on quiz)

Question 7

In many places, the term “head” is used to describe _______.

Answer 7

Pressure

Question 8

Pascals Law -

Answer 8

Pressure on a confined fluid is transmitted undiminished in all directions, and acts with equal force on equal areas and at right angles to them.
AKA
Fluid will try to escape and exert equal pressure at all directions when pressure is applied.

Question 9

What are the 3 ways pressure is created?

Answer 9

1. Weight of a column of fluid.
2. Force applied on a confined fluid.
3. Resistance to flow.

Question 10

What causes air to dissolve into liquid?

Answer 10

Atmospheric Pressure.

Question 11

What causes dissolved air to separate from water?

Answer 11

Lack of atmospheric pressure (vacuum).

Question 12

What is Boyles Law?

Answer 12

P1xV1
P2= ———
V2
P1 - Start Pressure
P2 - Increased Pressure
V1 - Large Volume
V2 - Small Volume

Question 13

What causes barometric pressure to rise?

Answer 13

Rise in atmospheric pressure.

Question 14

What is the definition of a vacuum?

Answer 14

Any pressure less than atmospheric pressure AKA A lack of atmospheric pressure.

Question 15

Where does fluid flow in a parallel flow path?

Answer 15

The the lowest pressure/flow path.

Question 16

What is an orifice?

Answer 16

Any restricted passage fluid passes through.

Question 17

What three things determine flow through an orifice?

Answer 17

1. The size of the orifice.
2. The viscosity or thickness of the fluid.
3. The pressure.

Question 18

According to Archimedes, what happens when an object floats in water?

Answer 18

The volume of water displaced is equal in weight to the object.

Question 19

According to Archimedes, what happens when an object sinks in water?

Answer 19

The volume of water displaced is equal to the volume of the object.

Question 20

A lift in a filling station has a 10in diameter piston. If the pressure required to lift a certain automobile is 50psi, how much does the automobile weight?

Answer 20

In order to solve, you use the formula F=PxA. The weight of the automobile is the force(F). The pressure of the piston(P) is 50psi. You need to find the area of the piston using the formula .7854x10² (.7854xD²). This gives you the area(A), which is 78.54. Then you plug in the number F=50x78.54 which equals 3,927lbs.

Question 21

What pressure would be required to lift a 5000lb load with a 6in diameter cylinder?

Answer 21

In order to solve, you will use the formula, P=F/A. You are solving for the pressure required to lift the load(P). The force(F) is given at 5000lbs. You solve for the area using the formula, .7854x6² (.7854xD²), which equals 28.2744. This gives you the area(A) of the cylinder. Then you plug in the numbers. P=5000/28.2744 which comes out to 176.84psi. REMEMBER!! Do not round until you have a final answer, use the ANS button on the calculator.

Question 22

If you need to lift a 60,000lb coil with a 5in diameter cylinder using 3000psi, can you lift the coil?

Answer 22

To solve this, you use the formula, F=PxA. You are solving for force(F). You have the pressure(P) of the cylinder at 3000psi. You need to solve for the area(A) of the cylinder using the formula, .7845x5² (.7854xD²) which gives you 19.635. Then you plug in the numbers. F=3000x19.635 which comes out to 58,905lbs. This means you cannot lift the coil.