Mechanical Fundamentals

Question 1

Like atoms that bond together chemically from molecules of a…

Answer 1

Element

Question 2

Unlike atoms that are chemically bound together form molecules of a…

Answer 2

Compound

Question 3

Water is a ___ with two kinds of atoms, hydrogen and oxygen.

Answer 3

Compound

Question 4

What is it called when two things are mixed together and don’t chemically combine?

Answer 4

Mixture

Question 5

What is the state of matter determined by?

Answer 5

Temperature and pressure

Question 6

As molecules are heated…

Answer 6

Speed increases and volume expands

Question 7

What is it called when there’s no lower temperature than when molecules cease motion?

Answer 7

Absolute zero

Question 8

Vacuum is a…

Answer 8

Closed space which all air and gases are removed

Question 9

Resistance of fluid flow varies with types of ___ and ___.

Answer 9

Fluids and temperatures

Question 10

Viscosity is…

Answer 10

Resistance to change in a liquid flow and shape

Question 11

What are the two kinds of energy?

Answer 11

Potential (position of mass) and kinetic (motion of mass)

Question 12

What are the two kinds of velocity?

Answer 12

Constant and variable

Question 13

Velocity is the …

Answer 13

Rate a mass travels in a direction

Question 14

Water hammer is…

Answer 14

Force/ shock when a liquid and a confined space is suddenly accelerated

Question 15

What are 6 simple machines?

Answer 15

Levers, wedge, inclined plane, pulleys, wheel and axle, screws

Question 16

Third class levers multiply ___ and ___ instead of force.

Answer 16

Speed and distance

Question 17

If the wheel is driving the axle, there is a loss in _______ because the driving belt is going seven times faster and further distance.

Answer 17

Mechanical advantage of speed

Question 18

On simple machines it is impossible to gain ___ and ___ at the same time.

Answer 18

Force and speed

Question 19

The four purposes of gears.

Answer 19

1. Transmit positive motion
2. To drive a second part in same or different direction of motor/ driving force
3. To actuate second gear at the same speed or different than the driver
4. To increase or decrease force

Question 20

With an odd number of gears in a simple gear train the driver and driven gears rotate and the ___ direction.

Answer 20

Same

Question 21

On an inclined plane what is the effort distance?

Answer 21

The length of the slope

Question 22

What are the four purposes of screw threads?

Answer 22

1. To transmit motion
2. To apply tremendous forces with little effort
3. To hold parts together
4. To obtain measurements

Question 23

Most screw threads are said to have…

Answer 23

A definite number of threads per inch

Question 24

Work definition

Answer 24

Overcoming resistance

Question 25

Turbulance

Answer 25

Loss of head at entrance of pipe

Question 26

Flow rate

Answer 26

Quantity of substance that moves past a point in a given time

Question 27

Pressure definition

Answer 27

Force exerted by a substance on a unit of area

Question 28

Energy definition

Answer 28

Capacity to do work

Question 29

Gravity definition

Answer 29

Acts in accordance with the law of falling bodies

Question 30

Power definition

Answer 30

Rate at which work is done

Question 31

Acceleration definition

Answer 31

Rate at which velocity increases with time

Question 32

Friction definition

Answer 32

Force that resists relative motion of 2 bodies that are in contact with each other