1What is tension (tensile stress)?
When a pull is exerted on each end of an object
2What is compression (compressive stress)?
When a push is exerted on each end of an object
3What is torsion stress?
When a twisting motion is exerted on a material
4What is shear stress?
If an equal but opposite pull or push is exerted on two materials connected by a pin, the shear stress is on the pin
5What is an electron?
An atomic particle with a very small negative charge
6How many electrons are in one coulomb?
6.28 x 10^18 electrons
7What is voltage and how is it represented in electrical diagrams?
It is the measure of a charge of one coulomb existing between two bodies. Represented by a V or E
8What are the ways voltage can be generated?
Friction, heat, magnetism, light, chemical reaction, pressure
9What is current?
The movement of electrons along a conductor measured in amps
10What is an amp?
The flow of one coulomb of electrons past a point in a circuit in one second. I represents current in diagrams
11What is resistance?
The opposition to current flow measured in Ohms and represented by R in diagrams
12What are the variables in V=IR?
Voltage = Amps x Ohms
13What materials have a low resistance?
Copper, aluminum, silver, gold, steel
14What materials have a high resistance?
Wood, rubber, air, plastics, glass
15How is area related to resistance?
It is inversely proportional. Bigger area = less resistance
16How is length related to resistance?
It is directly proportional. Longer = more resistance
17What is Direct Current (DC)?
Constant voltage
18What is Alternating Current (AC)?
Voltage varies over time
19What level of current can kill you?
.1 amps
20What is mass?
The total quantity of matter in an object
21What is weight?
The measure of force of attraction between the mass of the earth and mass of another object. W=mxg
22What are the different types of energy?
Mechanical energy with objects, thermal energy with molecules, chemical energy with the binding force of molecules, electrical
23What is potential energy?
Energy based on position
24What is kinetic energy?
Energy based on the relative velocities of objects
25What does energy in transition begin and end as?
Stored energy
26What is the first law of thermodynamics?
Energy in = energy out
27What is the second law of thermodynamics?
No engine can convert all heat supplied to it into work; some heat will be rejected
28What is heat?
Thermal energy in transition
29What are British Thermal Units (BTUs)?
The quantity of heat required to raise the temperature of 1 pound of pure water 1 degree Fahrenheit
30What is conduction?
Heat transfer by physical contact
31What is radiation?
Heat transfer without physical contact
32What is convection?
Heat exchange within a fluid (liquid or gas)
33What is sensible heat?
When the temperature changes
34What is latent heat?
When there is a phase change
35What does an NRR of 27 mean?
Noise is reduced by 27 dB
36What is Noise Reduction Rating (NRR) and what does it do?
A rating that indicates noise reduction; an NRR of 27 means noise is reduced by 27 dB
37What is a halfdeck?
Any partial deck between complete decks
38Where are platforms?
Partial decks below the lowest complete deck
39What is the quarterdeck?
An area designated by the captain for the conduct of official functions