M1 Quiz Info

Question 1

The force required to move a ship through calm water at a required speed….

Answer 1

Resistance

Question 2

The four main components of resistance are:

Answer 2

Skin or Frictional Resistance
Wave Making Resistance
Eddy-Making Resistance
Air Resistance

Question 3

Occurs due to the friction between the hull and viscous liquid (water)

Answer 3

Skin or Frictional Resistance

Question 4

Results from the generation of waves by the ship in motion

Answer 4

Wave Making Resistance

Question 5

Occurs when flow lines do not close in behind a moving hull, thus
creating a low-pressure area just behind the stern where eddies form

Answer 5

Eddy-Making Resistance

Question 6

_____ is a combination of frictional resistance and eddy- making resistance

Answer 6

Air Resistance

Question 7

Layers of water formed in Skin / Frictional Resistance are called _____

Answer 7

boundary layers

Question 8

The accumulation of water in the boudary layers
at the stern is what creates a _______

Answer 8

wake

Question 9

______ Resistance is when the bow and the stern each create a pressure distribution that generates waves when the ship moves through the water

Answer 9

Wave-making Resistance

Question 10

The system of waves created by the ship includes both _____ and _______

Answer 10

transverse and diverging waves

Question 11

Wave-making resistance in surface ships can be reduced by building ships with a _______

Answer 11

bulbous bow

Question 12

______ creates a pressure distribution that generates its own system of waves in order to cancel the waves generated by the ship

Answer 12

Bulbous Bow

Question 13

______ is the resistance that forms due to fluid flow behind abrupt discontinuities on the hull

Answer 13

Eddy-Making Resistance

Question 14

What is the largest type of resistance for a ship.

Answer 14

Skin or Frictional Resistance

Question 15

The most basic requirement of a ship’s design is that it be able____________ and ___________.

Answer 15

move through the water
control its direction of movement

Question 16

________Provides the mechanical energy to turn the shaft and propeller

Answer 16

Prime Mover

Question 17

steam turbines, diesel engine, and turbine engine are examples of a _________

Answer 17

prime mover

Question 18

Controlling a ship is a matter of controlling the direction and the velocity of the water that flows across the ______

Answer 18

rudder

Question 19

Conversion, transmission, and utilization of energy results in _______

Answer 19

ship propulsion

Question 20

The sequence of events that results in ship propulsion are:

Answer 20

1.) development of power in a prime mover(s)
2.) transmission of power to the propeller(s).
3.) development of thrust by the propeller(s).
4.) the use of thrust to move the ship through the water

Question 21

Four types of main propulsion plants:

Answer 21

conventional (boiler) steam plant
nuclear-powered steam plants
gas turbine plants
diesel engine plants

Question 22

three categories of diesel engines based on crankshaft rpm:

Answer 22

low-speed, medium-speed, and high-speed.

Question 23

Low-speed diesels have a very low crankshaft rpm of approximately ________

Answer 23

100 rpm

Question 24

Medium-speed diesel engines typically have crankshaft speeds up to ________

Answer 24

1,000 rpm

Question 25

High-speed diesel engines typically have crankshaft speeds ________

Answer 25

OVER 1,000 rpm

Question 26

______________ use diesel generator sets to produce electricity; propulsion power is not provide directly to the shaft

Answer 26

Diesel electric plants

Question 27

Frigates, destroyers, cruisers, and amphibious assault ships all use _________

Answer 27

gas turbine engines

Question 28

What is the major downside to a gas turbine engine?
How is this downside corrected?

Answer 28

gas turbines turn in only one direction = ship is unable to reverse
reversible-pitch propeller

Question 29

__________ has a greater endurance than any other propulsion plant

Answer 29

nuclear-powered steam plant

Question 30

The preferred choice for submarine propulsion is the ______ because it is not dependent on air for combustion.

Answer 30

nuclear plant

Question 31

One disadvantage of a nuclear plant is that the reactors are ____and _____________________

Answer 31

heavy
require large amounts of dense shielding

Question 32

Reduction gears are required because….

Answer 32

prime movers operate more efficiently at high speeds, and propellers operate more efficiently at low speeds

Question 33

A ___________ does not require reduction gearing

Answer 33

diesel-electric drive system

Question 34

Reduction gears on U.S. Navy ships are _________________

Answer 34

double-helical, locked-train, double-reduction gears

Question 35

___________ means the gears are cut at a special, helically designed angle

Answer 35

Double Helical

Question 36

_________ means the power from the prime mover distributes equally (when one gear moves - they all move) by two sets of gears and shafts

Answer 36

Locked Train

Question 37

_________ means the speed reduction takes place in two steps

Answer 37

Double Reduction

Question 38

second reduction gear is also called the _____

Answer 38

Bull gear

Question 39

The___________ is an axial bearing integral to the reduction gear

Answer 39

thrust bearing

Question 40

_________ are radial bearings supporting the propulsion shaft inside the ship.

Answer 40

Line Shaft bearings

Question 41

_________ are radial bearings that maintain proper alignment of the shaft outside the hull, support the external shafting and the propeller, and absorb radial thrust

Answer 41

Strut bearings