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30 Cards in this Set
- Front
- Back
What is the basic purpose of a shaft coupling?
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join the driver and driven shafts together
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For a given horsepower, increasing the speed of the machine _________ the torque transmitted
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decreases
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Which type of mechanical coupling cannot tolerate any misalignment
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rigid |
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Compression, ribbed, flange face and threaded couplings are classed as ______ couplings
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Rigid
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Which type of coupling grips the shaft by compressive forces?
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compression
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which type of coupling is constructed with a male and female flange fitted together?
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flange face
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What is the main advantage of a flexible coupling over a rigid coupling?
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they compensate for some misalignment
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What are the three types of shaft misalignment?
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parallel offset angular combination parallel and offset |
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Which chain coupling is recommended for high torque loads?
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silent chain
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The working principle of a gear coupling is similar to?
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a spline
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Which coupling offers excellent torsional flexibility?
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rubber tire
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Which flexible coupling uses a pair of three jawed hubs?
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jaw and spider
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Which types of coupling can be best used where deliberate misalignment exists in the drive?
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universal joint
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Allowing the drive to come up to running speed rapidly, then gradually bringing the driven load on the line refers to:
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centrifugal couplings soft start characteristics a method used to reduce high electrical current usage during start up conditions -all of the above |
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Which coupling provides built in overload protection?
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fluid
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Which device is used on a fluid coupling to permit hot oil to escape if excessive overloading occurs?
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fusible plug
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Dry fluid couplings use an actuating media of:
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steel shot
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Shear pin couplings:
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mechanically disconnect the driver from the driven machine
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Improper alignment usually is NOT one of the main causes of machine failure.
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FALSE
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The "bending moment" between two shafts identifies:
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shaft misalignment
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The machine's bedplate should be checked for distortion and levelness
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TRUE
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"Jacking bolts"
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are used to help correctly position the machine horizontally
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The centerline of the dial indicator plunger should be positioned to run through the centerline of the shaft
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true
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"Soft foot" is the term commonly applied to the condition that exists when all the machine feet ________ supporting the weight of the machine
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are not
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To correct for a soft foot condition, insert an amount of shim stock equal to the amount of deflection indicated by the dial indicator reading from:
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the foot being checked
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Bending of the dial indicator mounting bar presents significant errors in the dial readings used to align the machinery
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true
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indicate where the dial indicator should read from when checking coupling runout when it is believed the coupling's bore is made offset to the coupling itself.
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off the coupling rim
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When using the rim and face alignment method, the face dial is used to determine:
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angular misalignment
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If an electric motor is coupled to a centrifugal pump handling fluids over 300 degrees F would you add or remove shims at the electric motor to compensate for thermal growth?
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add
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When adding shims under a machine's foot, keep the number of shims to _____ or less
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4
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