What are heat exchangers? - Answer- Exchanges heat from one to another
How will a heat exchanger exchange fluid - Answer- From a hot fluid to a cold
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When does heat exchange occur at a faster rate - Answer- When there is a greater difference in temp
What are the 3 meathods of heat exchange - Answer- Conduction,convection,radiation
What are the 2 types of convection - Answer- Natural ,forced
What are the types of heat exchangers - Answer- Heaters,coolers,condensers
What are the 2 types of condensers - Answer- Main and auxiliary
What are the 2 types of heat flow - Answer- Direct and indirect
What is indirect heat flow - Answer- No direct contact
What is direct heat flow - Answer- Two fluids are mixed together
What are the types of direction of flow? - Answer- Parrellel,counter and cross flow
What is parallel flow - Answer- Allows it to flow in the same direction
What is counter flow - Answer- Fluids flow in different direction
What is cross flow - Answer- Allows fluid to flow at right angles from the other fluid
What are the basic types of shell and tube types - Answer- Straight tube,U-bend ,helical spiral,double tube and plane tube
What type of friction has the least amount? - Answer- Fluid friction
What is the purpose of bearings - Answer- Support and maintain the alignment of shafts,allowing shafts to rotate
What is a shaft - Answer- Solid or hallow metal rod that can support other mechanical devices such as gears,pulleys,propellers
What is radial movement - Answer- Movement at right angles to the shaft caused by centrifugal force or gravity
What is axial movement - Answer- Movement in line with the shaft and is normally caused by thrust
What are split joint bearings used for - Answer- Support and limit radial movement of shafts
What is the inside part of a split joint bearing called - Answer- Babbit
What is the kingsbury thrust bearing used for - Answer- Limit the axial movement of the propeller shaft and transfer thrust to the ships hull
What do ball and roller bearings do - Answer- Change sliding friction to rolling friction and limit radial and axial movement
What is another name for ball and roller bearings - Answer- Anti friction bearing
What are the types of ball and roller bearings - Answer- Radial ball bearings, inner ring,outer ring,cylindrical roller bearings,tapered roller bearings
What do inner rings do? - Answer- Expand to the shaft and rotate with the shaft
Does outer rings roatate? - Answer- No
What is cylindrical roller bearings do - Answer- Limit radialmovement of the shaft
What does the tapered roller bearings do? - Answer- Limit both radial and axial movement of the shaft
What do needle bearings do - Answer- Limit radial movement of a shaft
What is the purpose of gears - Answer- Change the direction of motion,speed
What are the 2 types of heat arrangements - Answer- 2 and 3
What type of gear do you use to change the speed. - Answer- Gears of different sizes
5 types of gears - Answer- Spur,pack and pinion,helical,bevel ,worm and warm wheel
What are 2 gear arrangements used for - Answer- Change directions
What type of gear has teeth that are cut straight across - Answer- External spur
What is external spur gear used for - Answer- Increase speed and decrease torque
What type of gear has teeth cut traight across on the inside - Answer- Internal spur gear
Purpose of internal spur gear - Answer- Change speed between the input shaft and output shaft but not change the direction of rotation
What type of gear has threads like a screw? - Answer- Worm wheel
What are the advantages of the worm wheel - Answer- Large speed reduction and produces little noise
What are the disadvantages of a worm wheel - Answer- Produces thrust
What is a "Rack and Pinion" gear? - Answer- 2 types of gears that work together to change rotary motion to linear motion
What is the external spur gear usually called for a rack and pinion gear - Answer- Pinion gear
What type of gear has teeth cut at a angle - Answer- Single helical
Advantages of single helical - Answer- Runs quietly
Disadvantage of single helical - Answer- Thrust or push axially on its shaft
What do you use to overcome the disadvantage of the single helical - Answer- Use a double helical
What are bevel gears used for? - Answer- Drive an output shaft at An angle to the input shaft
At what angle shafts are bevel gears mounted on ? - Answer- 90
What are the types of pumps onboard - Answer- Centrifugal,rotary,reciprocating,jet
Where does low pressure exist on a pump - Answer- Suction part
Where does high pressure exist at on the pump - Answer- Discharge portion
What is total head - Answer- Net difference between the suction head and the discharge head
What is the most common type of pump? - Answer- Centrifugal
Are centrifugal pumps classified? - Answer- Yes
What are rotary pumps useful for - Answer- Pumping oil and other viscous or thickness fluids
What type of pump has no moving parts - Answer- Jet pump
Purpose of couplings - Answer- Connect a driving shaft to a driver
3 types of misalignments - Answer- Offset,angular and offset angular does the rigid flange coupling accommodat for misalignment
What is the pin coupling used for - Answer- Medium torque and is not lubricated
What type of coupling is used for heavy torque and accommodates for slight misalignment - Answer- Gear coupling
What type of coupling is used for medium torque and a low horse power drive system - Answer- Rubber jaw coupling
What type of coupling is used for heavy torque and accommodates for slight miss alignment - Answer- Grid coupling
What type of coupling is flexible and used to connect two shafts that are not in the same plane - Answer- Universal joint coupling (Hooke)
What is the purpose of main shafting - Answer- Reduce high engine rpm to a useful low propeller rpm
What type of displacement is a centrifugal pump - Answer- Non positive
What is the purpose of the strut bearing - Answer- Supports the weight of the shaft externally
Where does primary sealing occur - Answer- Between the rotating seal and the stationary face
What are the 2 components of of the main and line shaft - Answer- Line shaft itself and it's bearings
What measures the water quality before it is discharged overboard - Answer- OCM
What is a service tank - Answer- Holds fuel oil for immediate use by propulsion equipment
What are storage tanks used for - Answer- Store new or renovated oil
What are ballast tanks used for - Answer- Can be filled with water or fuel to maintain ships stability
Where are ballast tanks located - Answer- Below the waterline
What are the circuits for primary operation - Answer- 1JV AND 6JV
What circuit is used for secondary operation. - Answer- 21mc
What are pipe fittings used for - Answer- Connect, terminate or change directions of pipes
What are pipe flanges used for - Answer- Connect pipes to valves,machinery,or other pipes [Show Less]