MD PRIME TERMS (1-500)

Heating above the transformation range, usually 1300°F to 1350°F, and cooling slowly to soften the metal and increase in machining

A. Annealing
B. Hardening
C. Normalizing
D. Tempering

A. Annealing

Heating above the transformation temperature and quenching usually in oil, for the purpose of increasing the hardness:

A. Annealing
B. Hardening
C. Normalizing
D. Tempering

B. Hardening

Reheating to a temperature below the transformation range, followed by any desired rate of cooling to attain the desired properties of the metal

A. Annealing
B. Hardening
C. Tempering
D. Stress Relieving

C. Tempering

Heating to a subcritical temperature, about 1,100°F to 1,300°F and holding at that temperature for a suitable time for the purpose of reducing internal residual stresses

A. Annealing
B. Hardening
C. Tempering
D. Stress Relieving

D. Stress Relieving

Heating to some 100°F above the transformation range with subsequent cooling to below that range in still air at room temperature to produce uniform structure of the metal

A. Annealing
B. Hardening
C. Normalizing
D. Tempering

C. Normalizing

A machine tool used for producing holes in metal by the use of a cutting tool called drill

A. Drilling machine
B. Boring machine
C. Milling machine
D. Broaching machine

A. Drilling machine

A machine tool used to form metal parts by removing metal from a workpiece by the use of a revolving cutter with many teeth each tooth having a cutting edge which removes its share of the stock

A. Drilling machine
B. Boring machine
C. Milling machine
D. Broaching machine

C. Milling machine

A machine tool used to sharpen or shape tools by using an abrasive wheel

A. tool grinder
B. shaper
C. planer
D. power saw

A. tool grinder

A machine tools used to enlarge a hole by means of an adjustable cutting tool with only one cutting edge

A. drilling machine
B. boring machine
C. milling machine
D. broaching machine

B. boring machine

A machine tool used to cut metal parts of light, medium, and large sections using a reciprocating hacksaw blade

A. tool grinder
B. shaper
C. planer
D. power saw

D. power saw

A machine tool used to machine flat or plane surfaces with a single point cutting tool

A. tool grinder
B. shaper
C. planer
D. power saw

B. shaper

A machine tool used for production of flat surfaces on pieces too large or too heavy to hold in a shaper:

A. tool grinder
B. shaper
C. planer
D. power saw

C. planer

A machine tool used to finish internal or external surfaces, such as holes or keyways by the use of a cutter called a broach, which has a series of cutting edges or teeth

A. drilling machine
B. boring machine
C. milling machine
D. broaching machine

D. broaching machine

An alloy of copper and tin

A. brass
B. bronze
C. Iron
D. Tin

B. bronze

An alloy of copper and zinc

A. Brass
B. bronze
C. Iron
D. Tin

A. Brass

The process of forming metal parts by the use of dies after the metal is heated to its plastic range

A. rolling
B. forging
C. turning
D. casting

A. rolling

The process of forming metal parts by the use of a powerful pressure from a hammer or press to obtain the desired shape, after the metal has been heated to its plastic range

A. rolling
B. forging
C. turning
D. casting

B. forging

A manganese steel containing approximately 0.20% carbon

A. SAE 1320
B. SAE 1230
C. SAE 2340
D. SAE 4230

A. SAE 1320

A machine tool in which metal is removed by means of a revolving cutter with many teeth, each tooth having a cutting edge which remove its share of the stock

A. milling machine
B. broaching machine
C. lathe machine
D. boring machine

A. milling machine

A metal turning machine tool in which the work, while revolving on a horizontal axis, is acted upon by a cutting tool which is made to move slowly (feed) in a direction more or less parallel to the axis of the work (longitudinal feed)

A. milling machine
B. broaching machine
C. lathe machine
D. boring machine

C. lathe machine

A machine tool used in the production of flat surfaces on pieces too large or too heavy or, perhaps too awkward to hold in a shaper

A. shaper
B. planer
C. tool grinder
D. power saw

B. planer

It consists of shaping a piece by bringing it into contact with a rotating abrasive wheel

A. drilling
B. boring
C. grinding
D. broaching

C. grinding

A tool used in measuring diameters

A. caliper
B. nanometer
C. tachometer
D. pyrometer

A. caliper

Used to true and align machine tools, fixtures, and works, to test and inspect size trueness of finished work, and to compare measurements either heights or depths or many other measurements

A. dial gauge
B. dial indicator
C. tachometer
D. speedometer

B. dial indicator

The ability of metal to be deformed considerably without rupture

A. ductility
B. plasticity
C. malleability
D. elasticity

B. plasticity

The shop term used to include the marking or inscribing of center points, circles, arcs, or straight lines upon metal surfaces, either curved or flat, for the guidance of the worker

A. shaping
B. hobbing
C. laying out
D. shaping

C. laying out

An operation of sizing and finishing a hole by means of a cutting tool having several cutting edges

A. notching
B. piercing
C. turning
D. reaming

D. reaming

The operation of making a cone-shaped enlargement of the end of a hole, as for a recess for a flat head screw

A. Countersinking
B. knurling
C. squaring
D. perforating

A. Countersinking

The operation of enlarging a hole by means of an adjustable cutting tool with only one cutting edge

A. drilling
B. broaching
C. milling
D. boring

D. boring

An imaginary circle passing through the points at which the teeth of the meshing gears contact each other

A. pitch circle
B. addenduim circle
C. dedendum circle
D. base circle

A. pitch circle

A type of bolt intended for use in bolting wooden parts together or wood to metal. It has a short portion of shank just underneath a round head, which is designed to keep the bolt from turning in the wood when the nut is tightened

A. u-bolt
B. carriage bolt
C. eye bolt
D. stud bolt

B. carriage bolt

The number of teeth per inch of pitch diameter and which gives some indications of the size of the gear teeth

A. module
B. pitch circle
C. diametral pitch
D. circular pitch

C. diametral pitch

The distance from the center of one tooth of a gear to the center of the next consecutive tooth measured on the pitch

A. circular pitch
B. module
C. diametral pitch
D. pitch circle

A. circular pitch

The portion of a gear tooth that projects above or outside the pitch circle

A. top relief
B. dedendum
C. addendum
D. tooth space

C. addendum

The portion of the gear tooth that is cut below the pitch circle and is equal to the addendum plus the clearance

A. top root
B. dedendum
C. addendum
D. top land

B. dedendum

When meshed with a gear, it is used to change rotary motion to reciprocating motion

A. gear shaft
B. gear tooth
C. gear rack
D. gear motor

C. gear rack

A kind of gears used for heavy duty works where a large ratio of speed is required and are extensively used in speed reducers

A. bevel gears
B. worm gears
C. helical gears
D. spiral gears

B. worm gears

A kind of gears used to transmit motion from one shaft to another shaft at an angle to the first

A. bevel gears
B. worm gears
C. helical gears
D. spiral gears

A. bevel gears

The uniform heating of steel above the usual hardening temperatures, followed by coolong freely in air

A. annealing
B. normalizing
C. hardening
D. tempering

B. normalizing

The operation of cooling a heated piece of work rapidly by dipping it in water, brine or oil

A. quenching
B. tempering
C. normalizing
D. annealing

A. quenching

A method used in softening a piece of metal that is too hard to machine and is done by heating steel slowly above the usual hardening temperature, keeping it at the heat for 1/2 to 2 hours, then cooling slowly, preferably in a furnace

A. broaching
B. quenching
C. normalizing
D. annealing

D. annealing

The total permissible variation in the size of a dimension; the difference between the limits of size

A. allowance
B. tolerance
C. variance
D. interface

B. tolerance

The operation of machining the end of a workpiece to make the end square with the axis

A. squaring
B. buffing
C. lapping
D. honing

A. squaring

The clearance between the tooth profiles of a gear tooth

A. toothspace
B. backlash
C. flank
D. width

B. backlash

A mechanism which usually do the indexing in a machine tool

A. slotter
B. chuck
C. dividing head
D. indexer

C. dividing head

A material that can wear away a substance softer than itself

A. phenol
B. abrasive
C. tungsten
D. chromium

B. abrasive

A cylindrical bar of steel with threads formed around it and grooves or flutes running lengthwise in it, intersecting with the threads to form cutting edges. It is used to cut internal threads

A. groove
B. lap
C. tap
D. flute

C. tap

A set of gages consisting of thin strips of metal of various thickness mounted in a steel case or holder and is widely used for measuring and checking clearances

A. feeler gage
B. depth gage
C. line center gage
D. lay-out gage

A. feeler gage

A machine tool which is very similar to a shaper except that the ram reciprocates vertically rather than horizontally

A. lathe
B. grinder
C. planer
D. slotter

D. slotter

A machine tool used principally to machine flat or plane surfaces with single-point cutting tool

A. grinder
B. shaper
C. planer
D. turret lathe

B. shaper

A kind of bolts which has no head an instead has threads on both ends

A. stud bolts
B. acme threaded bolts
C. square threaded bolts
D. hex bolts

A. stud bolts

A kind of chuck which has reversible jaws which coukd be adjusted separately

A. collet chuck
B. independent chuck
C. four jaw chuck
D. two jaw chuck

B. independent chuck

A tool which when pressed into a finished hole in a piece of work, provides centers on which the piece may be turned or otherwise machined

A. mash
B. butt
C. mandrel
D. wobble

C. mandrel

A kind of chuck which should not be used where extreme accuracy is required

A. collet chuck
B. magnetic chuck
C. four jaw chuck
D. Universal chuck

D. Universal chuck

The process of checking or producing checkers on the surface of a piece by rolling checkered depressions into the surface

A. knurling
B. hemming
C. breading
D. embossing

A. knurling

It fits into the main spindle of a lathe and is so called because it acts as a bearing surface on which the work rests. It revolves with the work. When compared with the hardness of the dead center in the tailstock, it is usually soft, and is so made since it does no work

A. ram center
B. spindle center
C. live center
D. bearing center

C. live center

A gripping device with two or more adjustable jaws set radially

A. chuck
B. carriage
C. tailstock
D. fan

A. chuck

Steel balls for ball bearings are manufactured by:

A. turning
B. rolling
C. casting
D. cold heading

D. cold heading

Addendum of a cycloidal gear tooth is:

A. Cycloid
B. epicycloids
C. straigth rack
D. involute

B. epicycloids

In a lathe, it comprises the main spindle, the necessary mechanism for obtaining the various spindle speed and also certain gears which are used to operate the quick-change gear mechanism

A. headstock
B. carriage
C. tailstock
D. fan

A. headstock

The process of heating a piece of steel to a temperature within or above criticak range and cooling rapidly

A. normalizing
B. hardening
C. annealing
D. tempering

B. hardening

Welding operation in which a non-ferrous filler metal melts at a temperature below that of the metal joined but is heated above 450°C

A. gas welding
B. spot welding
C. brazing
D. steam welding

C. brazing

Uniting two pieces of metal by means of a different metal which is applied between the two in molten state

A. casting
B. welding
C. soldering
D. brazing

C. soldering

Fusion process in which the metal is heated into a state of fusion permitting it to flow together into a solid joint

A. electric arc welding
B. gas welding
C. spot welding
D. projection welding

A. electric arc welding

Joining metal by means of high current at low voltage. During the passage of current, pressure by the electrodes produces a forge weld

A. spot welding
B. resistance welding
C. steam welding
D. gas welding

B. resistance welding

A device for accurately measuring diameters

A. radiometer
B. profilometer
C. spectrometer
D. micrometer

D. micrometer

A group of thin steel strips for measuring clearances

A. distortion gage
B. feeler gage
C. line center gage
D. deflection gage

B. feeler gage

A hand tool used to measure engine crank web deflections

A. distortion gage
B. feeler gage
C. line center gage
D. deflection gage

A. distortion gage

A hand tool used to measure tension on bolts

A. Indexer
B. torque wrench
C. torsiometer
D. tensiometer

B. torque wrench

The permissible variation in the size of a dimension; the difference between the limits of size

A. allowance
B. variance
C. clearance
D. tolerance

D. tolerance

A gear with teeth on the outer cylindrical surface

A. outer gear
B. external gear
C. spiral gear
D. helical gear

B. external gear

The diameter of a circle coinciding with the top of the teeth of an internal gear

A. pitch diameter
B. root diameter
C. internal diameter
D. central diameter

C. internal diameter

A circle coinciding with a tangent to the bottom of the tooth space

A. root circle
B. pitch circle
C. addendum circle
D. dedendum circle

A. root circle

The total depth of a tooth space, equal to addendum plus dedendum

A. full depth
B. working depth
C. whole depth
D. dedendum

C. whole depth

The depth of tooth space below the pitch circle

A. dedendum
B. working depth
C. full depth
D. tooth depth

A. dedendum

The of gear teeth to each mm pitch diameter

A. diametral pitch
B. module
C. circular pitch
D. english module

A. diametral pitch

A machine tool in which abrasive wheel is used as cutting tool to obtain a very smooth finish

A. drill
B. grinder
C. planer
D. shaper

B. grinder

It is used to produce a variety of surfaced by using a circular-type cutter with multiple teeth

A. grinding machine
B. shaper
C. drilling machine
D. milling machine

D. milling machine

It is used principally to machine flat or plane surfaces with a single-point tool

A. drill
B. shaper
C. planer
D. tool grinder

B. shaper

Cutting a hole by means of rotating tool or the work may revolve and to the tool remain fixed as in the lathe

A. piercing
B. notching
C. boring
D. perforating

C. boring

One of the following is not a tap used for cutting threads in holes

A. tapping tap
B. plug tap
C. taper tap
D. bottoming tap

A. tapping tap

An index or dividing head

A. a part of a drill press
B. used to rotate the work
C. not used to cut helixes
D. always manually operated

B. used to rotate the work

Galvanized iron is a term referring to iron coated with:

A. tin
B. zinc
C. magnesium
D. aluminum

B. zinc

The moment of inertia of a rectangle whose base is "b" and height "h" about its base is:

A. bh^3 / 12
B. bh / 36
C. bh^3 / 3
D. bh^2 / 4

C. bh^3 / 3

In usual spur gearing:

A. the pitch circle and the base circle are the same
B. working depth includes the clearance
C. tooth outline are usually involute curves
D. tooth outline are always cycloidal curves

C. tooth outline are usually involute curves

A stainless steel is obtained principally by the use of the following alloying element

A. Chromium
B. tungsten
C. carbon
D. phenol

A. Chromium

One of the following is not a common term relating to the classification of fits

A. tunking
B. snug
C. medium force fit
D. bound

D. bound

Hearingbone gears are gears which:

A. do not operate on parallel shaft
B. have a line of contact between the teeth
C. consist of two left handed helical gears
D. tend to produce thrust on the shafts

B. have a line of contact between the teeth

Internal stresses existing in a welded connection:

A. are not relieved when the weld is peened
B. are not relieved by heat treatment
C. may be relieved when the weld is peened
D. are relieved by x-ray analysis

A. are not relieved when the weld is peened

In general the design stress and factor of safety are related as follows:

A. Design stress \= ultimate stress times factor of safety
B. Design stress \= ultimate stress divided by factor of safety
C. Design stress \= Design stress divided by ultimate stress
D. Design stress \= factor of safety divided by design stress

B. Design stress \= ultimate stress divided by factor of safety

A group of thin steel strips for measuring clearances

A. depth gage
B. feeler gage
C. lay-out gage
D. clearance gage

B. feeler gage

A hand tool used to measure tension on bolts

A. Indexer
B. torsionmeter
C. torque wrench
D. tensiometer

C. torque wrench

A material that can wear away a substance softer than itself

A. abrasive
B. corrosive
C. tungsten
D. alloy

A. abrasive

The material used in high speed processes

A. high speed steel
B. chromium
C. cast iron
D. carbon steel

A. high speed steel

An alloy of copper and zinc

A. chromium
B. bronze
C. brass
D. aluminum

C. brass

An alloy of copper, tin and small amount of phosphorus

A. chromium
B. bronze
C. brass
D. aluminum

B. bronze

The process of working metals by the application of sudden blows or by steady pressure

A. welding
B. extursion
C. forging
D. swaging

C. forging

A welding operation in which a non-ferrous filler metal melts at a temperature below that of the metal joined but is heated above 450°C

A. brazing
B. spot welding
C. gas welding
D. projection welding

A. brazing

The operation of cooling a heated piece of work rapidly by dipping it in water, brine or oil

A. tempering
B. annealing
C. quenching
D. normalizing

C. quenching

A machine tool used to machine flat surfaces

A. shaper
B. planer
C. grinder
D. Lathe

A. shaper