Final Review

Question 1

2.) Describing how a 4-stroke engine works

Answer 1

1 power stroke per 2 crankshaft rev
Intake→Compression→Power→Exhaust

Question 2

3.) Components of a diesel engine (piston, cam shaft, etc.)

Answer 2

-Reciprocating only (Back & forth): piston/valves
-Reciprocation & rotary (Back/Forth & Revolves): connecting rod
-Rotary only (Revolves): crankshaft and camshaft

Question 3

5.) Function of a Reduction Gear

Answer 3

Fast to Slow
Reduces the rotational speed of the engine’s output shaft to a level suitable to drive the propeller efficiently.

Question 4

6.) Classifying Reduction Gear and What They Do

Answer 4

-Double Helical
-Double Reduction
-Locked Trained
-Articulated

Question 5

7.) Drawing/labeling a Rankine cycle (components, heat or work flows)

Answer 5

Boiler/heat source (heat added) heats water into steam, increasing pressure/temp. Turbine (work out) expands the steam to do mechanical work. Condensor (heat out) cools steam converting it back to water (rejecting heat). Pump (work in) pumps high-pressure water from the condenser to the heat source.

Question 6

8.) Writing 6 factor formula (neutron life cycle equation)

Answer 6

ε → total # fast neutrons
L^f → fast neutron leakage (out) / fast neutron escaping leakage (in)
p → neutron captured in U-238 (out) / thermalized neutrons (in)
L^t → thermal neutron leakage (out) / thermal neutron escaping leakage (in)
f → thermal neutrons absorbed in control rods (out) / thermal neutrons absorbed in fuel (in)
Σf/Σa → thermal neutrons captured in fuel w/o fission (out) / thermal neutrons captured in fuel which cause fission (in)
v → fast neutrons produced by thermal fissions

Question 7

10.) Critical Q (Critical, subcritical, supercritical)

Answer 7

Critical: fission rain sustained
Subcritical: fission rate decreases
Supercritical: fission rate increases

Question 8

11.) How a gas turbine works (With the components)

Answer 8

Compressor takes in air compressing it at high pressure using the turbine via shaft. High-pressure air is fueled & ignited (creating high-energy gas). The turbine expands the high energy gas driving the turbine blades to power the compressor.

Question 9

14.) Purpose of a Relief Valve

Answer 9

Opens automatically when fluid pressure is too high to protect piping system from excessive pressure

Question 10

16.) Defining Criticality

Answer 10

Stateof a substance near or at the critical point, especially in the context of phase transitions near the critical point.

Question 11

17.) 3 types of Breathing Protection

Answer 11

-OBA
-EEBD
-EAB
-SCBA

Question 12

OBA

Answer 12

Oxygen Breathing Appartus

Question 13

EEBD

Answer 13

Emergency Exit Breathing Device

Question 14

EAB

Answer 14

Emergency Air Breathing

Question 15

SCBA

Answer 15

Self-Contained Breathing Apparatus

Question 16

22.) Advantage of Nuclear Power over Convention Power

Answer 16

-Less Fuel Needed
-Produces Low Levels of Greenhouse gasses
-Operate Continuously for Long Periods

Question 17

Isobaric

Answer 17

Pressure constant

Question 18

Isocharic

Answer 18

Volume constant

Question 19

Isothermal

Answer 19

Temp constant

Question 20

Adiabatic

Answer 20

No loss/gain of heat

Question 21

25.) 3 major types of radiation

Answer 21

Alpha
Beta
Gamma

Question 22

Alpha radiation

Answer 22

Releases helium nucleus

Question 23

Beta radiation

Answer 23

Emits electron or positron

Question 24

Gamma radiation

Answer 24

Releases radiation

Question 25

26.) Advantages of Hydraulic Systems

Answer 25

Advantages: Power, accuracy, efficiency, and easy maintenance. Disadvantages: Fluids can leak (very messy) and sensitive to temperature change

Question 26

27.) Uses of Hydraulics on Warships

Answer 26

1.) Hatches for Torpedoes 2.) Weapons Elevator 3.) Watertight Doors 4.) Anchor Windlass (Raise/Lower Anchor) 5.) Rudder (Directing Sailing Direction 6.) Stabilizing Fins (Reduces rolling in rough seas) 7.) Missile Launchers 8.) Davits

Question 27

28.) Drawing/labeling refrigeration cycle

Answer 27

Expansion Valve → (low pressure liquid) → Evaporator → (low pressure gas) → Compressor → (high pressure gas) → Condensor → (high pressure liquid) → Expansion Valve

Question 28

29.) Types of Fires

Answer 28

-Class Alpha (Wood) -Class Bravo (Flammable Liquids) -Class Charlie (Electrical Equipment) -Class Delta (Metal)

Question 29

Extinguishing Agent for Class Alpha Fire

Answer 29

Water/CO2

Question 30

Extinguishing Agent for Class Bravo Fire

Answer 30

AFFF

Question 31

Extinguishing Agent for Class Charlie Fire

Answer 31

Turn off electricity

Question 32

Extinguishing Agent for Class Delta Fire

Answer 32

Jettison/Flood

Question 33

30.) PMS Acronym

Answer 33

Preventative Maintainance System Ensures all equipment on a ship/aircraft doesn’t fail beforehand (prematurely)

Question 34

31.) ISIC

Answer 34

Immediate Superior in Command -Next higher level of command authority is directly responsible for command.

Question 35

32.) Define TYCOM

Answer 35

Type Commands Performs administrative, personnel, and operational training functions for a “type” of the weapon system (aviation, sub, surface).

Question 36

33.) 1st Law of Thermodynamics

Answer 36

Energy cannot be created or destroyed. It can only be converted from one form to another.

Question 37

34.) 2nd law of thermodynamics

Answer 37

Total entropy of an isolated system will either increase or remain constant. It can never decrease.

Question 38

Double Helical (Reduction Gear)

Answer 38

Two sets of teeth cut at opposite angles, eliminating axial thrust

Question 39

Double Reduction (Reduction Gear)

Answer 39

Compact where pinion (small) gear drives drives

Question 40

Locked Trained (Reduction Gear)

Answer 40

Reduces load on each tooth by 50% reducing the size of the gears minimizing gear climb

Question 41

Articulated (Reduction Gear)

Answer 41

Greater Power due to shortened size of reduction gears