Metulurgy, Shafts, Fits, Lubrication Test Flashcards by shawn Burleigh

What is the best definition of metallurgy?

Study of structure, properties, extraction and refining of metals

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True or false , alloy steel has other elements in it to improve its mechanical properties?

True

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True or false, aluminum is used because it is light weight and resists corrosion?

True

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What is the difference between hot and cold rolled steel?

Hot rolled steel has the scales still left on the surface after being rolled

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Which of the following is NOT a mechanical property of metals? 
Hardness 
Toughness
Tensile strength 
Softness

Softness

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Which of the following is a physical property of metals? 
Colour 
Texture 
Weight 
All of the above

All of the above

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Stress relieving high carbon steels to 400 to 600 degrees F and letting it cool down is an action of?

Tempering

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When quenching steel you will use______to help it cool?

Air
Oil
Water or brine
Any of the above

Any of the above depending on how quickly it needs to be cooled

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The carbon content of low carbon steel(mild)?

.02% to .30%

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An increase in carbon content will?

Increase the hardness

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The lower critical temperature of carbon steel is?

1333 degrees F

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Annealing is?

To make the hardened work piece soft again for machining

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Tempering steel is to relieve the amount of hardening ________

And internal stress by heating the steel to below the lower critical temperature and cooling at any desired rate

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Perlite is?

Structure of soft steel consisting of layers of ferrite and cementite

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Martensite is?

A structure of hardened steel consisting of angular needle like crystals

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Austenite is?

Form of steel at high temperatures (Ferite and cementite dissolve into each other)

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Cementite means?

A type of iron carbide

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Hardness means the ability of metal to?

Resist penetration

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Toughness means the ability of metal to?

Withstand shock of impact

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Ductility means the ability of metal to?

Be deformed without breaking

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Tensile strength means the ability of metal to?

Withstand pull without breaking

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Pipes and tubes can be produced in two ways________ and __________

Rolled and welded

And

Pierced and formed

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Cast iron is considered to have the carbon content of?

1.7% to 4.5%

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What makes stainless steel corrosion resistant?

Chromium

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Brass is a mixture of?

Copper and zinc

Which of the following is not a tool steel sub group? High speed Water hardening Shock resistant Quench and temper

Quench and temper

A light straw Colour when heating up steel during tempering and before cooling would be good for what type of tools?

Cutting tools

When testing a piece of steel with a file, you find that the file can barely cut the metal, what Rockwell hardness is the steel?

In this classification 1141, what does 41 stand for?

Carbon content

Hardness testing can be done in different ways, which one of the following is not a true test? Rockwell Brinell File Torch

Torch

MTR stand for ________ (when dealing with steel orders)

Mill test reports

The main difference between ferrous and non ferrous metals are?

Iron content and magnetism

When identifying metal you can do which of the following? Look at the colour Look at the fractured surface Look at the shape All of the above?

All of the above

When using a spark test to find out the type of material, what spark shape would high speed steel have?

Orange Colour with little branching, ends up in ball shaped sparks

How can S shape steel be distinguished f from W shape? ``` By the flange shape Flange width Web thickness Web length All of the above ```

Flange shape Or all of the above

What is the shape destination of L6x6x1

Equal leg angle iron

How do you size hollow structural steel?

Wall thickness and outside diameter or dimensions

Given identical sized pieces of metal, zinc and die cast aluminum what would the simplest way to identify them be?

By weight

Only steel with a carbon content of_______ can be hardened?

.2%

True or false, beryllium bronze is a health hazard when it is machined. The particles produced are toxic and must not be inhaled or permitted to touch the skin.

True

True or false Keys are timing devises to fail before any other part in the gear train, shaft, or hub assembly?

True

The width of a square or flat key should be about _______ of the shaft diameter?

1/4

A Pratt and Whitney key is?

Boxed or blind key

A woodruff key?

Can be used on a parallel or tapered shaft

A tapered gib head key has a taper of

1/8 or 1 and 96

True or false A saddle key does not require a key seat in the shaft?

True

True or false A feather key can be fixed or sliding?

True

If you had a woodruff key with a number 406 the width would be _______ and the diameter would be_________?

1/8th in 4 x 32nds And 3/4 in 6 x 8ths

True or false Parallel key seats in shafts can be open or tapered?

False

The accurate, proper depth of a key seat in the shaft is measured from?

The bottom of the shaft to the bottom of the key seat

You should not use a ______ with a cast hub?

Tapered key

Key stock is manufactured with low to medium carbon steel (aisi) 1020 to a _______ tolerance

Plus (oversized)

Key seats in hubs and attachments will be cut to a depth equal to?

Half the key plus the clearance (.005)

You can cut keys seats with? Potable key seat cutter Hand broaching with an arbour press Milling machine and windmill All of the above

All of the above

When installing keys on shafts and in tapered bushings, you can put anti seize on the keys and taper of the bushing to help stop seizing and damage to the bushing? True or false

False Only put anti seize on key and shaft

When fitting keys, A class _______ fit has a tight fit while a class _____ fit has a clearance fit?

2 tight 1 clearance

There should always be a clearance .005” on the ______ of the key?

Top

Set screws are used to lock attachments onto shafts, for positive locking power you should? Use 2 set screws of similar width to the key Lubricate threads of screw for maximum thrust Use knurled cup point set screw for positive positioning All of the above?

All of the above

To help facilitate removal of hubs and attachments you should? Make sure there are not 2 set screws File a flat where the set screw will sit Use fox wedges to help removal of gib keys All of the above

All of the above

To help facilitate the removal of tapered keys, the gib head should be 1/4” away from the hub to allow for wedges? True or false

True

When removing stubborn parallel keys you can use? Slide hammers A Dutchman Locking pliers All of the above

All of the above

A journal is the part of the spindle, shaft, or axle that rotates in or on a plain friction bearing? True of false

True

Finished shafting is manufactured to wide tolerances and uses finishes like cold rolled, machining, grinding . And polishing? True or false

False

C 1045 is precision shafting (precision ground and polished from medium carbon stee) and has a carbon content of ?

.45%

Hollow shafting is found on shaft mounted reducers? True or false

True

Shaft stresses include bending, shear, and ________

Torsional shear

Whenever there is a shoulder machined into a shaft there should be a _________ at the base of the shoulder to help strengthen the shaft and reduce the stress in this area. It should also allow the bearing to sit up against the _________

Fillet And Shoulder

When checking for ________, you should put the shaft in the lathe centres and set up __________ to measure for it while rotating the shaft 360 degrees?

Run out And Dial indicators

If a bearing fit on a shaft it will creep? True or false

True

The ________ bushing does not have a key in the taper of the bushing?

Tapered sleeves are used for positive bearing location and fit, they have a washer to lock the sleeve onto the shaft? True or false

False the taper locks the bearing to the shaft.

Shear pins ________ the machine drive in an overload situation.

Disconnect

When locking eccentric locking collars onto the bearing and shaft you must rotate the eccentric lock in the direction of the shaft rotation? True or false

True

Line shafting has bearings located a maximum distance of _______ between bearings and the fixed bearing should be located as close as possible to the _______

8’ And Drive unit

Tapered dowel pins have a taper of ______ per foot

1/4

Tolerances for dimensioning are the total permissible variation in its size and also determines the fit between mating parts? True or false

True

ANSI fits are broken down into 3 groups: running and sliding fits, location fits, and force fits? True or false

True

Isometric fits have_______ case letters that represent the hole or bore size and _______ case letters that represent the shaft size

Upper And Lower

When selecting a puller, the ________ determines the puller size? Reach Spread Force required All of the above

All of the above

Presses must have proper guarding in place before putting them to use? True or false

True

Basic size is the nominal size before __________

Adding tolerances

If a shaft has a plus tolerance of +.004 and a minus tolerance of -.000 this would be a?

Unilateral tolerance

Allowance is? The intentional difference between mating parts at MMC The minimum clearance (positive allowance) of mating parts Maximum interference (negative allowance) of mating parts All of the above

All of the above

MMC is?

Shaft is as big as allowed and hole is as small as allowed

Which type of fit can be sliding and press fit?

Transition

Freeze fitting is what type of fit?

Expansion

If you used a hydraulic press to push a hub onto a shaft this would be a _______ fit?

Force

Surface finish is measured in micro inches or micro meters with a toughness grade from N1 to N12 True or false

True

A revision number to a drawing is enclosed in __________ and is located near the revised dimension? Triangle Circle All of the above

All of the above

Lubrications main function is to reduce?

Friction

Sliding friction has?

Adhesive wear and asperities touching and welding

Rolling friction has?

A small contact area and slightly deformed

Fluid friction has

No metal to metal contact, has electromagnetic bonds

Viscosity is? The resistance to flow in fluid The most important property of lubricating oil Measured in centi strokes And SUS All of the above

All of the above

Viscosity index identifies the amount of change in the viscosity of a lubricant over a temperature range(40 to 100 degrees c) a high Vi number means?

A small change in viscosity

An oil wedge is formed by hydrodynamic principles as the shaft rotates? True or false

True

Boundary film forms? At low speeds At high speeds At low viscosity Both 1st and 3rd answers are correct

Both 1st and 3rd answers are correct

Which is the correct sequence for the formation of an oil wedge? 1: the oil wedge drags the oil into the loaded area 2: shaft journal starts to climb the boundary lubricated area on rotation 3: journal starts to skid as it climbs onto the area of partial lubrication 4: boundary film adheres to the journal beside loaded area.

4 2 3 1

To have full hydrodynamic lubrication (at running speed) you will need to?

Have a RPM and viscosity high enough to form full film lubrication

Petroleum based oils: Do not wear out Are stable up to 55 degrees C Cheap compared to other oils All of the above

All of the above

Naphtha based oils have the highest wax content?

False

Synthetic oils Eliminate wax problems Made up of atleast 10 chemical bases Stable up to 250 degrees C All of the above

All of the above

The total additive package of base oils is about _____% of the oil?

Which of the statements is NOT true about oxidation? Rate of oxidation of petroleum oils doubles with every 8 degrees c above 55 degrees c Produces sludge Raises viscosity of the oil Increases the presence of anti oxidants

Increases the presence of anti oxidants

Rust and corrosion inhibitors work by forming a protective layer on the metal surfaces? True or false

True

Load capacity controls with additives such as ______ and ________ help with wear during boundary lubrication?

Anti wear And E.P

E.P additives with sulphur and phosphorus corrode copper and bronze True or false

True

When oil wand water are separated they are said to be?

Demulsafied

A lubrications systems job is to wet the surfaces of the rolling elements and maintain the oil level of?

1/3 to 1/2 the way up the lowest rolling element

Once the systems do not recycle the oil. Which of the following is not a once through system? Bottle Wick feed Hand oiler Splash

Splash

Which of the following systems use capillary action to move the oil? Bottle Wick feed Hand oiler Splash

Wick feed

The wick feed and drip feed have ways to adjust the amount of oil being delivered? True or false

True Different size wicks will determine flow

On worm and wheel reducers the? Worm passes oil to the wheel from the oil bath Wheel passes the oil to the top of the bearings by having scrapers take it off the wheel Flingers on the worm pass oil to the worm bearings All of the above

All of the above

In recirculating pressure lubrication systems the reservoir helps: Cool the oil Aerate the oil Settle out contaminants Both 1 and 3 are correct

Both 1 and 3 are correct

Oil mist lubrication? Is used for high speed bearings Can be once through Is used for high speed roller chain All of the above

All of the above

Block lubrication systems have advantages, which is Not one of them? Single point adjustable flow volume with one pump Rupture disc feature Allows easy recycling of the oil to the tank Modular design of divider blocks

Allows easy recycling of oil to the tank

An industrial mechanic can check oil by smell, touch and sight. When using sight, you can check the oil for? Oxidation Disolved water or air Metalic particles All of the above

All of the above

Oil analysis tells about the? Types of contamination Viscosity Wear Rate and condition of the machine All of the above

All of the above

Wear metal in oil samples is measured in parts per million and identifies the wearing components. This procedure is called spectroscopy. True or false

True

Partial counts in oil samples tells us the number of particles per million for each of the following particle sizes?

2, 5 , 15

Grease is made up of a liquid lubricant and a? Soap Clay Thickener All of the above

All of the above

Consistency of grease is the degree to which it resists deforming under force and is?

Measured using a cone penetration test and given a NLGI number

Greases are classified by the type of thickener, NLGI number and?

It’s application

The base oil held in a thickener is released by the addition of?

Pressure

Inorganic non-soap thickeners are good in high temperatures and wet conditions? True or false

True

A grease with a NLGI grade will be a _______ grease?

Hard

Low temperature operation greases would require a NLGI of 0 to 1 with a oil viscosity of about _______ Centistrokes?

When dealing with heavy loads with grease, you want to have grease with? Molybdenum EP additives Water Both 1 and 2 are correct

Both 1 and 2 are correct

When packing a bearing with grease, you will pack the housing ________ full for high speeds and ________ full for slow speeds?

1/3 for high speed 1/2 for low speeds

When using pneumatic manual or electric grease guns the tip must be kept clean? True or false

True

Dry solid lubricants like graphites are used in pins and bushings where moisture is present? True or false

True

Automatic centralized grease systems can lubricate many areas with a metered amount at a given rate or time? True or false

True

Metulurgy, Shafts, Fits, Lubrication Test Flashcards

(132 cards)