ENG WEPS NAVY OCS EXAM WITH ALL CORRECT &
100% VERIFIED ANSWERS|ACTUAL COMPLETE EXAM|
ALREADY GRADED A+
· Thermodynamics ✔Correct Answer-the study of interrelationship between thermal and
mechanical energy
thermal energy ✔Correct Answer-Heat energy
mechanical energy ✔Correct Answer-the amount of work an object can do because of the object's
kinetic and potential energies
Energy ✔Correct Answer-The capacity of a system to do work or produce an effect
What are the two ways to measure energy? ✔Correct Answer-Temperature and pressure
MARMKE ✔Correct Answer-Measure of the average random molecular kinetic energy - how fast
particles are moving/vibrating.
Pressure formula ✔Correct Answer-P=F/A
0th Law of Thermodynamics ✔Correct Answer-If two bodies, A and B, are at the same
temperature, and body C is at the same temperature as body B, then all three bodies are at the same
temperature
1st Law ✔Correct Answer-The Law of Conservation of Energy—energy can neither be created nor
destroyed
2nd Law ✔Correct Answer-Heat will only flow from hot to cold
Newton's Third Law of Motion ✔Correct Answer-For every action, there is an equal and opposite
reaction
Bernoulli's equation ✔Correct Answer-relates fluid velocity to fluid pressure; as velocity increases,
the pressure exerted by the fluid decreases causing suction or lift.
Ideal Gas Law ✔Correct Answer-the direct relation of pressure, volume, and temperature of an
ideal gas which is a theoretical gas composed of randomly-moving, non-interacting particles
PV=nRT
What is the relationship between Pressure and Volume (P&V)? ✔Correct Answer-They do not have
a linear relationship.
Potential Energy ✔Correct Answer-Ability of an object to do work based on its location relative to
the system in which it is contained
Kinetic energy ✔Correct Answer-Ability of a substance or object to do work based on its motion
, Negative side effects of Cavitation ✔Correct Answer-· Causes excessive vibration on the propeller
and propulsion train
· Loss in efficiency and pitting of the propeller
What are the specific components of a Naval Propulsion Train? ✔Correct Answer-Main Reduction
Gear, Bearings, Propeller(s)
Types of Main Reduction Gears ✔Correct Answer-Double Helical
Double Reduction
Locked-Train
Articulated
Double Helical ✔Correct Answer-two sets of teeth cut at opposite angles making it smoother and
quieter, eliminates axial thrust
Double Reduction ✔Correct Answer-Speed reduction takes place in two steps - High speed pinion
(first reduction gear) , or Low speed pinion (bull gear)
Locked Train ✔Correct Answer-Reduces the load on each tooth by 50%, reducing the size of the
gears and having two first reduction gears.
Minimizes gear climb
Articulated ✔Correct Answer-Long gear shafts absorb more torque. Effectively increases length of
gear shaft without taking up more space.
Journal Bearing ✔Correct Answer-Supports the shaft radially (prevents sagging or bowing)
Hard shell on outside, soft liner Babbitt inside
Thrust Bearing ✔Correct Answer-Supports the shaft axially (transmits the thrust from the propeller
into the ship/ push-pull)
What is the purpose of lube oil in propulsion trains? ✔Correct Answer--removes heat from wear
surfaces
-reduces fiction
-minimizes corrosion
What are the lube oil tolerances? ✔Correct Answer-Purity (contamination)
-pressure(maintain supply to all components)
-temperature (moved through a closed system to remove heat)
Cavitation ✔Correct Answer-· Propeller rotating faster than certain critical speeds creates low
pressure on the back of propeller blades which vaporizes sea water and forms a spiral trail of bubbles
that emerge from each blade tip.
Controllable Pitch Propeller ✔Correct Answer-turns each propeller on its own axis
fixed pitch propeller ✔Correct Answer-Blade angle cannot be changed but the direction of shaft
can
100% VERIFIED ANSWERS|ACTUAL COMPLETE EXAM|
ALREADY GRADED A+
· Thermodynamics ✔Correct Answer-the study of interrelationship between thermal and
mechanical energy
thermal energy ✔Correct Answer-Heat energy
mechanical energy ✔Correct Answer-the amount of work an object can do because of the object's
kinetic and potential energies
Energy ✔Correct Answer-The capacity of a system to do work or produce an effect
What are the two ways to measure energy? ✔Correct Answer-Temperature and pressure
MARMKE ✔Correct Answer-Measure of the average random molecular kinetic energy - how fast
particles are moving/vibrating.
Pressure formula ✔Correct Answer-P=F/A
0th Law of Thermodynamics ✔Correct Answer-If two bodies, A and B, are at the same
temperature, and body C is at the same temperature as body B, then all three bodies are at the same
temperature
1st Law ✔Correct Answer-The Law of Conservation of Energy—energy can neither be created nor
destroyed
2nd Law ✔Correct Answer-Heat will only flow from hot to cold
Newton's Third Law of Motion ✔Correct Answer-For every action, there is an equal and opposite
reaction
Bernoulli's equation ✔Correct Answer-relates fluid velocity to fluid pressure; as velocity increases,
the pressure exerted by the fluid decreases causing suction or lift.
Ideal Gas Law ✔Correct Answer-the direct relation of pressure, volume, and temperature of an
ideal gas which is a theoretical gas composed of randomly-moving, non-interacting particles
PV=nRT
What is the relationship between Pressure and Volume (P&V)? ✔Correct Answer-They do not have
a linear relationship.
Potential Energy ✔Correct Answer-Ability of an object to do work based on its location relative to
the system in which it is contained
Kinetic energy ✔Correct Answer-Ability of a substance or object to do work based on its motion
, Negative side effects of Cavitation ✔Correct Answer-· Causes excessive vibration on the propeller
and propulsion train
· Loss in efficiency and pitting of the propeller
What are the specific components of a Naval Propulsion Train? ✔Correct Answer-Main Reduction
Gear, Bearings, Propeller(s)
Types of Main Reduction Gears ✔Correct Answer-Double Helical
Double Reduction
Locked-Train
Articulated
Double Helical ✔Correct Answer-two sets of teeth cut at opposite angles making it smoother and
quieter, eliminates axial thrust
Double Reduction ✔Correct Answer-Speed reduction takes place in two steps - High speed pinion
(first reduction gear) , or Low speed pinion (bull gear)
Locked Train ✔Correct Answer-Reduces the load on each tooth by 50%, reducing the size of the
gears and having two first reduction gears.
Minimizes gear climb
Articulated ✔Correct Answer-Long gear shafts absorb more torque. Effectively increases length of
gear shaft without taking up more space.
Journal Bearing ✔Correct Answer-Supports the shaft radially (prevents sagging or bowing)
Hard shell on outside, soft liner Babbitt inside
Thrust Bearing ✔Correct Answer-Supports the shaft axially (transmits the thrust from the propeller
into the ship/ push-pull)
What is the purpose of lube oil in propulsion trains? ✔Correct Answer--removes heat from wear
surfaces
-reduces fiction
-minimizes corrosion
What are the lube oil tolerances? ✔Correct Answer-Purity (contamination)
-pressure(maintain supply to all components)
-temperature (moved through a closed system to remove heat)
Cavitation ✔Correct Answer-· Propeller rotating faster than certain critical speeds creates low
pressure on the back of propeller blades which vaporizes sea water and forms a spiral trail of bubbles
that emerge from each blade tip.
Controllable Pitch Propeller ✔Correct Answer-turns each propeller on its own axis
fixed pitch propeller ✔Correct Answer-Blade angle cannot be changed but the direction of shaft
can
