Fluid Dynamics

Question 1

Specific Gravity Equation

Answer 1

SG = weight of sample / weight of equal volume of water

Question 2

What do we use to measure specific gravity?

Answer 2

Hydrometer

Question 3

If the hydrometer measures more than 1000, what happens to the float?

Answer 3

Float will rise

Question 4

If the hydrometer is less than 1000, where does the float sit?

Answer 4

The float will sink

Question 5

If the float is =1000

Answer 5

The float is fully immersed in pure water

Question 6

What is viscosity?

Answer 6

Viscosity is the opposition to flow

Question 7

What happens to the viscosity in a LIQUID if temperature is increased?

Answer 7

Viscosity will decrease

Question 8

What happens to the viscosity in a GAS if temperature is increased?

Answer 8

Viscosity will increase

Question 9

What is the unit for viscosity?

Answer 9

Ns/m^2

Question 10

What does streamlining do?

Answer 10

Decreases the friction

Reduces air resistance

Question 11

How do you work out the total pressure?

Answer 11

Total pressure = static pressure + dynamic pressure

Question 12

What does static pressure depend on?

Answer 12

Height

Question 13

What does dynamic pressure depend on?

Answer 13

Flow

Question 14

How do you find the absolute pressure?

Units?

Answer 14

Absolute Pressure = Gauge Pressure + Atmospheric Pressure

Units: N/m^2

Question 15

At sea level, what is the atmosphere in lbs./inch^2 and in mmHg?

Answer 15

14.7 lbs./in^2

760 mmHg

Question 16

What does Bernoulli’s Principle state?

Answer 16

When a fluid is in motion (without energy being added or taken away) :

Potential energy decreases when kinetic energy increases
Pressure decreases when velocity increases

Question 17

What does volume flow rate suggest with Bernoulli’s Principle?

Answer 17

A constant flow of fluid through a pipe for 1 minute will give you the same volume of water out as a constant flow of fluid through the same pipe, if squeezed, for one minute.

Question 18

If a pipe is raised higher, what does that mean for the pressure?

Answer 18

Pressure will also increase

Question 19

What is the pressure if a fluid determined by?

Answer 19

Height

Question 20

Boiling and freezing point of water in degrees Celcius?

Answer 20

Boiling point : 100 degrees

Freezing point : 0 degrees

Question 21

Boiling and freezing point of water in Kelvin?

Answer 21

Boiling point : 373 K

Freezing point : 273K

Question 22

Boiling and freezing point of water in Farenheit?

Answer 22

Boiling point : 212 degrees Farenheit

Freezing point : 32 degrees Farenheit