couplings self test questions Flashcards
couplings are used to connect shafts that are end to end ?
true
compressing couplings use keys to transfer torque between hubs and shafts ?
false
grip the shaft by using tapered sleeves in tapered hubs
flange face couplings have male and female hubs?
true
gear couplings with straight teeth are a good example of rigid couplings
false
gear couplings are mechanical flexible couplings
rubber tire couplings can be clamped in place or may have rubber bonded to the coupling ?
false
a rubber tire coupling can accommodate axial movement angular and offset alignment conditions ?
true
the coupling that can accommodate the most offset misalignment is the single flexible disk ?
false
a curved tooth gear coupling has both material and mechanical flexibility ?
false
just mechanical flexibility because of clearance between the teeth and shape of the teeth
jaw and spider couplings are mainly used for high power drives that require no shock dampening
fasle
used on small to medium HP
steel grip couplings and chain couplings require lubrication
true
pin and rubber bushings can accomodate substation axial float?
true
universal joins are best kept in accurate alignment for long service life
false
single universal joints can only accomodate small angular misalignment
true
constant velocity joints (cv joint)
are more versatile than universal joints
true
fluid couplings have an out put member called an impeller
false
out put is the turbine
input is the impeller
the speed of engagement on a centrifugal coupling can easily be changed ?
false
fluid couplings have maximum vortex flow with in the coupling at start up
true
dry shot couplings should ne filled with the correct level of hydraulic oil and never overfilled ?
false filled with heat treated steel shot
the sheer pin in a shear pin coupling fails when the coupling is subject to overload or severe shock load ?
true
floating shaft couplings are used to save space ?
false
used when drive components can not be located close to the driving motor
when a machine needs to be held at rest or stopped quickly a brake wheel coupling is a good choice ?
true
Misalignment is the greatest cause of coupling wear and destruction
true
All coupling should be well lubricated after installation
fasle
a flexible coupling that is hot after running for a few hours may have serious alignment problems
true
true or false
Flexible couplings can be
mechanical flexible, material flexible and a combination of material and mechanical flexibility
true
If you need a chain coupling for heavy loads and speeds up to 5000 rpm you would use a
silent chain coupling
______on gear couplings help allow for more misalignment then straigth teeth. They are good for high torque and high rpm.
curved teeth
_______ couplings are the easiest to install but you may have to install press or shrink fit couplings also. When heating couplings heat hubs to approximately _____ above Ambiant temperature for every 0,001”of interference per inch of hub diameter
clearance fit
180 f
When removing a coupling hub make sure to heat the hub quickly and evenly . If done slowly the shaft will be heated and expand causing drag on the coupling. When removing any hub with a puller make sure to take out all set screws as they can be dragged across the shaft causing metal build up and stopping the hub from coming off.
Make sure to use proper bolts and parts for all coupling replacements. This will help keep the coupling?
balanced
