FINAL EXAM Flashcards by Jordan Amburn

Hardening of most steels will increase ______.
a) strength
b) durability
c) brittleness
d) none of the above

c) brittleness

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The process of hardening includes heating, soaking (in a furnace), and ______.

a) drying
b) quenching
c) cooling
d) releasing

b) quenching

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Re-heating (tempering) the steel after the hardening process reduces the ______.

brittleness

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Tempering also relieves _____ _____.
a) internal stress
b) external stress

a) internal stress

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Annealing process is generally done to relieve ____ stress.

internal

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Which doesn’t belong as a requirement for full annealing:
a) higher temps
b) longer soaking time
c) longer cooling times
d) less cooling times

d) less cooling times

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Normalizing Process is similar to annealing but is for ______ metals only.

ferrous

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Case hardening makes the surface of the material hard but allows the _____ to be softer

inside

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Bearings support direct contact with a ________, ________, and ________

moving machine part, rotating parts, and sliding parts

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Bearings confine motion of _______

moving parts

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Which doesn’t belong: Bearings minimize
a) friction
b) wear
c) vibration
d) power losses
e) induces power loss

e) induces power loss

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Plain bearings are generally made of a _____ material that will not scratch the shaft.
a) hard
b) durable
c) softer
d) none of the above

c) softer

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Most shafts are made from plain, _______.

low carbon steels

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Which doesn’t belong:
Improper lubrication means—
a) too much
b) not enough
c) the wrong kind of lubricant
d) the right amount

d) the right amount of

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Because the contact area of a ball bearing is smaller than that of a roller bearing, ______ is less but ____ is higher
a) load capacity; speed capacity
b) speed capacity; load capacity

a) load capacity; speed capacity

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Roller bearings have a _____ contact area.
a) lower
b) neutral
c) higher
d) none of the above

c) higher

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Which doesn’t belong:
The most common Cage materials are—
a) low carbon steel
b) brass
c) plastic
d) nylon
e) wood

e) wood

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The major limitation of anti-friction bearings is their lack of resistance to _____.
a) fatigue
b) heat
c) air
d) lubricant

a) fatigue

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Fatigue failure begins as _____, caused by repeated stress

flaking

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Flaking leads to ______, where metal begins to chip or break away

spalling

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Severe conditions include extremes of ______, ______, and _____

temperature, humidity, and vibrations

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_____ seals only keeps the lubricant in the bearing

Primary

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_____ seals only keep contaminants out of the bearing

Secondary

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T or F: Most couplings — connect 2 shafts together, allow for minor misalignment, allow for axial movement

True

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Some couplings will also do these “special” functions in addition to their “normal” functions—which doesn’t belong ? a) dampen vibration b) absorb torque c) provide electrical insulation d) balance shafts

d) balance shafts

________ will generally be all that is required for coupling installation and removal

Simple hand tools

Shaft alignment should always be done to the ________

best of your ability

Alignment between two shafts (same size) can be checked with a _____ and _____

straight edge, feeler gauge

The most common type of misalignment is _________

Combination parallel and angular

Two major classes of couplings is _____ and _____

solid couplings and flexible couplings

Flanged couplings usually have ____ faces

flat

________ couplings have a rubber-like insert between the coupling halves, The inserts are called _____.

Flexible Jaw; Spiders

The two types of gear couplings are _____ and _____

Rubber and Metal

When cleaning the mounting feet and the base, the first thing to do is inspect the ______. It should be in good condition. No cracks crumbling, deterioration, corrosion, extreme wear, etc

FOUNDATION

Safety First should always practice ____

Lock out/tag out

Before starting the alignment procedure, check ________

the motor and the driven equipment for “soft foot”

Do not try to correct soft foot by _____ the offending foot extra tight

tightening

When placing the dual indicator to see movement for soft foot, it should be placed on the ______

motor shaft

Heating a bearing to slide into shaft is called _____

shrink fit

Never pass the forces of the press through the ______ of a bearing when pressing onto a shaft

rolling elements

The best tool to remove bearings is called _____

bearing pullers

For belt drives, power is transmitted by _____ between the belt and the pulleys

friction

V-belt drives are _______ drives, they can slip

non-positive

Belts typically last ____ years

Conventional belts are sized by the letters: A, B, C, D, E. “__” is the smallest

Narrow belts (wedge) are sized by: ___, ____, ___

3V, 5V, 8V

________—used for precise timing of equipment or where slippage cannot be allowed

Timing belts

For sheave inspection look for : _____, ____, ____, _____

- general condition - rust, scale - sheave grooves - cracks, dents

___% stretch on a belt will provide adequate tension

Never pry belts on or off of a pulley with a _______

screwdriver

Drive Chain Advantage is a ______ drive

positive

______ is the distance from a point on one link to a corresponding point in an adjacent link, usually from center to center. a) sprocket b) chain pitch c) backlash

b) chain pitch

______ are the most common type of drive chain

roller chains

Silent chain is made of heat treated _______ or ______. It can be made of _____ steel too.

high-carbon, alloy; stainless steel

______ chains are a modification of standard roller chain. Often used as a hoist chain but can be used as a drive chain in gritty, abrasive environments

Rollerless

______ chains are when the rollers are spaced twice as far apart as in the standard roller chain

Double Pitch

____ chains are not used as drive chains. Used in forklift trucks and hoisting devices

Leaf

A modification of the Leaf chain is the ______ chain used in pipe vices and chain wrenches

wrench

Sprocket classes are A, B, C, D — used to describe the ___ ____

hub class

Excessive chain ____ can cause accelerated wear or chain overload

tension

Excessive chain ____ can cause rough chain operation and possibly result in the chain skipping a sprocket tooth, resulting in a catastrophic failure

slack

Proper Chain Tension — For drives operating at high speeds, impulse or reversing loads, the total mid-span movement should be 2%-3% of the center distance or about __ inch for every ___ inches between the sprocket centers

1/4” for every 12”

For the majority of low to medium speed drives, the total mid-span movement in the slack span of the chain should be approximately ___% to ___% of the drive’s center distance

4% to 6%

All chain drives should receive regular maintenance. Each drive should be inspected after the initial ___ hours of operation

100

_______ is the play between the teeth that prevents binding. ______ is necessary because binding of mating gears can result in heat generation, noise, abnormal wear, overload, and failure of the drive

Backlash

______ is the comparison between the pitch diameter of the drive gear versus the pitch diameter of the driven gear

Gear Ratio

All modern gear teeth (except worm gears) are similar in shape. This is called the _______

involute tooth form

_____ gears: tooth design provides for very few teeth to be in mesh at any one time, low to medium speed, noisy, generally used in low power applications, and smaller in size

Spur

Single cut helical gears create thrust motion and require ________

thrust bearings

____________ gears: center gap allows cooling, lubrications, and high speeds

Double cut helical

__________ gears: has no center clearance so speeds must be slower

Herringbone

_____ gears: designed to transmit power at angles, are not always used to change speeds, shaft centerlines will intersect each other

Bevel

_____ gears: are bevel gears that are used where the shafts intersect at a right angles (90°), generally no change in speed (1:1)

Miter

________ gears: quieter, smoother in operation. Can handle faster speeds and heavier loads

Spiral Bevel

______ gears: similar to spiral bevel gears except they are used where shaft centerlines do not intersect

Hypoid

_______ gear sets: operates like a screw, provides quiet operation with steady speeds

Worm