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Engineering > Material Science Terms > Flashcards

Material Science Terms Flashcards

1
Q

If 1080 steel (0.80 wt. % C) is annealed by very low cooling from 1000 deg C (1832 deg F) to ambient temperature, its microstoture will consist solely of:
A. Pearlite
B. Bainite
C. Cementite
D. Martensite

A

A. Pearlite

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2
Q

Which of the following is not a method of nondestructive testing of steel castings and forging?
A. Chemical analysis
B. Magnetic particle
C. Ultrasonic
D. Liquid penetrant

A

D. Liquid penetrant

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3
Q

Compressive strength of fully cured concrete is most directly related to:
A. Sand gravel ratio
B. Fineness modulus
C. Aggregate gradation
D. Water cement ratio

A

D. Water cement ratio

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4
Q

All of the following groups of plastics are thermoplastic, except:
A. Polyvinyl chloride (PVC) and polyvinyl acetate
B. Polyethylene, polypropylene, and polystyrene
C. Tetrafluoroethylene (Teflon) and other fluorocarbons
D. Phenolics, melamine and epoxy

A

D. Phenolics, melamine and epoxy

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5
Q

A gear with teeth on the outer cylindrical surface.
A. Worm gear
B. External gear
C. Internal gear
D. Bevel gear

A

B. External gear

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6
Q

A circle coinciding with a tangent to the bottom of the tooth space.
A. Pitch circle
B. Internal diagram
C. Dedendum
D. Root circle

A

D. Root circle

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7
Q

Cutting a hole by means of a rotating tool or the work may revolve and the tool remain fixed as in the lathe.
A. Boring
B. Milling
C. Brazing
D. Bevel gear

A

A. Boring

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8
Q

Fusion process in which the metal is heated to a state of fusion permitting to flow together into a solid joint.
A. Soldering
B. Resistance welding
C. Oxyacetylene
D. Brazing

A

D. Brazing

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9
Q

The process of checking or producing checkers on the surface of a piece by rolling checkered depression into the surface.
A. Indexing
B. Knurling
C. Squaring
D. Laying out

A

B. Knurling

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10
Q

The clearance between the tooth profile of gear tooth.
A. Backlash
B. Gear rack
C. Addendum
D. Dedendum

A

A. Backlash

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11
Q

When meshed with a gear, it is used to change the rotary motion to reciprocating motion.
A. Bevel gear
B. Worm gear
C. Super gear
D. Gear rack

A

D. Gear Rack

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12
Q

The distance from the center of one tooth of a gear to the center of the next consecutive tooth measured on the pitch.
A. Pitch circle
B. Circular pitch
C. Diametral pitch
D. Pitch diameter

A

B. Circular pitch

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13
Q

An operation of making a cone shaped enlargement of the end of a hole, as for a Recess for a flathead screw.
A. Knurling
B. Couter sinking
C. Indexing
D. Boring

A

B. Counter sinking

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14
Q

Tool when pressed into a finished hole in a piece of work, provide centers on which the piece may be turned or otherwise machined.
A. Spindle
B. Jaws
C. Clock
D. Mandrel

A

D. Mandrel

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15
Q

The total deformation measured in the direction of the line of stress.
A. Tolerance
B. Variation
C. Poisson’s ratio
D. Strain

A

D. Strain

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16
Q

The process of producing a variety of surfaces by using a circular type cutter with multiple teeth.
A. Planning
B. Milling
C. Shaping
D. Brazing

A

B. Milling

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17
Q

Alloy steel known for its resistance to corrosion, abrasion and wear that is usually ideal for mill grinding ore in a cement and concentrator application. It is usually combined with molybdenum to increase the depth hardening.
A. Manganese steel
B. Chromium-moly steel
C. Chrome nickel alloy steel
D. Manganese-moly steel

A

B. Chromium-moly steel

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18
Q

Killed steel is very much associated with
A. Manganese
B. Sulfur
C. Phosphorus
D. Silicon

A

D. Silicon

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19
Q

Which of the following does cold-working cause?

A

C. Elongation of grains in the flow direction, a decrease in dislocation density, and an overall increase in energy of the metal

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20
Q

Which of the following statements is false?

A

C. Cold working causes a slight decrease in the density and electrical conductivity of metal.

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21
Q

Which of the following correctly describes atoms located at grain boundaries?

A

D. All of them are correct.
• They are subjected to the same type of inter-atomic forces that are present in the interior atoms of the crystals
• They are located primarily in highly strained and distorted positions.
• They have higher free energy than atoms in the undisturbed part of the crystal lattice.

22
Q

Which of the following statements is false?

A

A. Hot working causes much strain hardening of the metal.

23
Q

Which of the statements describe the glass transition temperature?

A

D. I & ll
I. It is the temperature at which the rate of volume contraction increases abruptly.
II. It is the temperature at which residual stresses in the glass can be relieved.

24
Q

Which of the following is not a structural class of steels?
A. Carbon
B. High strength, low alloy
C. Tool & die
D. Stainless

A

C. Tool & die

25
Q

Low carbon steels are generally used in the “as rolled” or “as fabricated” state.
Whatvis the reason for this?

A

B. Their strength generally cannot be increased by heat treatment.

26
Q

Which of the following statements is false?

A

C. Additions of small amounts of silicon to steel can cause a marked decrease in yield strength of the steel.

27
Q

Which of the following statements is false?

A

B. There are three types of stainless steels: martensitic, austenitic, and ferritic

28
Q

Which of the following would not likely require a steel containing 0.6% carbon that has been spheroidized, cold drawn, and slightly tempered?
A. A bridge beam
B. A water pipe
C. A cutting tool
D. A ball bearing

A

D. A ball bearing

29
Q

Which of the following statements is false?

A

D. The addition of small amounts of molybdenum to low-alloy steels makes it possible to harden and strengthen thick pieces of the metal by heat treatment.

30
Q

Under which type of loading does fatigue occur?
A. Static load
B. Plane load
C. High load
D. Repeated load

A

D. Repeated load

31
Q

A specimen is subjected to a load. When the load is removed, the strain disappears. From this information, which of the following can be deduced about this material.
A. It is elastic.
B. It is plastic.
C. It has a high modulus of elasticity
D. It does not obey Hooke’s Law

A

D. It does not obey Hooke’s Law

32
Q

Which of the following metal is nonmagnetic?
A. Cast iron
B. Alloy steel
C. Stainless steel
D. Manganese steel

A

D. Manganese steel

33
Q

Which of the following is not used to temper steel?
A. Brine or salt bath
B. Oil bath
C. Water bath
D. Steam bath

A

D. Steam bath

34
Q

Which of the following is not a type of power hacksaw?
A. Power hacksaw
B. Crosscut saw
C. Horizontal Power saw
D. Band saw

A

D. Band saw

35
Q

Which of the following is not a strength property of metal?
A. Tensile strength
B. Rocking strength
C. Torsional strength
D. Fatigue strength

A

B. Rocking strength

36
Q

Which of the following metals melts slowly and becomes dull red before melting?
A. Manganese steel
B. Stainless steel
C. Cast iron
D. Wrought iron

A

D. Wrought iron

37
Q

Which area of the machine is where metal is being melted to form them into new shape?
A. Welding area
B. Mass production area
C. Tool and die area
D. Foundry area

A

D. Foundry area

38
Q

Which area of the machine shop is where quality, quantity and popularity of final product depend?
A. Stock area
B. Assembly area
C. Quality and control area
D. Production area

A

C. Quality and control area

39
Q

One important skill that operators of machine tools mus have is an understanding of measurement which demand…
A. Precision
B. Speed
C. Neatness
D. Sociability

A

A. Precision

40
Q

A machine used in shaping metals by means of abrasive wheel or the removal of metals with an abrasive is called…
A. Planer machine
B. Power saw
C. Shaper
D. Grinder

A

D. Grinder

41
Q

The ability of a metal to withstand loads without breaking down is…
A. Stress
B. Strain
C. Strength
D. Elasticity

A

C. Strength

42
Q

The ability of a material to resist being crushed is…
A. Torsional strength
B. Compressive strength
C. Bending strength
D. Fatigue strength

A

B. Compressive strength

43
Q

The ability of metal to withstand forces thus allowing member to twist is…
A. Torsional strength
B. Bending strength
C. Fatigue strength
D. Compressive strength

A

A. Torsional strength

44
Q

Which of the following is not a part of a lathe machine?
A. Headstock
B. Tailstock
C. Carriage
D. Fan

A

D. Fan

45
Q

The machine which can flatten surface horizontal, vertical, or angular plane is…
A. Shaper machine
B. Drilling machine
C. Power saw
D. Welding machine

A

A. Shaper machine

46
Q

Which of the following is not part of the headstock?
A. Spindle
B. Back gear
C. Motor
D. Anvil

A

D. Anvil

47
Q

Ferrous metals contain large amounts of…
A. Carbon
B. Manganese
C. Sulfur
D. Phosphorus

A

A. Carbon

48
Q

Which of the following is not a classification of an iron ore?
A. Hermatite
B. Magnetite
C. Sulfurite
D. Siderite

A

C. Sulfurite

49
Q

Which of the following is not the work of a machinist?
A. Grinding
B. Honing
C. Reboring
D. Overhauling

A

D. Overhauling

50
Q

Which of the following is not a kind of mandrel?
A. Expansion mandrel
B. Taper mandrel
C. Contraction mandrel
D. Gang mandrel

A

D. Gang mandrel

Engineering (1 decks)

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