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MD ELEMENTS PER 50 > E1_51-100 > Flashcards

E1_51-100 Flashcards

1
Q
  1. Which of the following is used to keep a metal clean while soldering?

A. Flax
B. Flux
C. Torch
D. Insulated

A

B. Flux

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2
Q
  1. Before splicing electric wires, they should be:

A. Tinned
B. Soldered
C. Cleaned and tinned
D. Insulated

A

C. Cleaned and tinned

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3
Q
  1. Before drilling a hole in a piece of metal, it should be:

A. Marked with chalk
B. Scribed
C. Center-punched
D. Protracted

A

C. Center-punched

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4
Q
  1. To check the speed of a motor or other rotary machine, one would use a:

A. Galvanometer
B. Tachometer
C. Micrometer
D. Geiger counter

A

B. Tachometer

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5
Q
  1. A tap or die marked ¼ - 20 indicates:

A. ¼” radius – 20 cm. long
B. ¼” diameter – 20 threads per in.
C. ¼” radian – 20 threads per in.
D. ¼” turn – 20 times

A

B. ¼” diameter – 20 threads per in.

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6
Q
  1. After a piece of pipe has been cut, the hole is cleaned out with a:

A. Piper reamer
B. Pipe taper
C. Pipe cleaner
D. Hole cleaner

A

A. Piper reamer

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7
Q
  1. How do you call the tool(s) used for cutting pipe threads?

A. Pipe cutter
B. Pipe threader
C. Pipe stock and die
D. Pipe ratcher cutter

A

C. Pipe stock and die

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8
Q
  1. How do you call the tool used when working with larger sizes of pipe?

A. Chain pipe wrench
B. Cahin holder
C. Chain tongs
D. A or B

A

D. A or B

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9
Q
  1. What tool is used when preparing to put fittings on copper tubing?

A. Tube spreader
B. Tube retarded
C. Flaring tool
D. Tube countersink

A

C. Flaring tool

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10
Q
  1. What are the most commonly used materials as photo cathode for the photoelectric emission?

A. Barium and calcium
B. Cesium and rubidium
C. Arsenic and boron
D. Thorium and tungsten

A

C. Arsenic and boron

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11
Q
  1. Manganese is an alloy of

A. Copper, manganese and nickel
B. Copper, zinc and lead
C. Copper, aluminum and chromium
D. Copper, chromium and cadmium

A

A. Copper, manganese and nickel

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12
Q
  1. The one that is an acceptor impurity element.

A. Antimony
B. Gallium
C. Arsenic
D. Phosphorus

A

B. Gallium

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13
Q
  1. Which of the following is not a method of non-destructive testing of steel castings
    and forging?

A. Radiography
B. Magnetic particle
C. Ultrasonic
D. Chemical analysis

A

D. Chemical analysis

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14
Q
  1. All of the following statements about rusting of iron are correct, except:

A. Contact with water and oxygen are necessary for rusting to occur.
B. Contact with a more electropositive metal reduces rusting.
C. Halides aggravate rusting process which involves electrochemical oxidation
reduction reaction.
D. Pitting occurs in oxygen-rich anodic areas and the rust is deposited nearby.

A

D. Pitting occurs in oxygen-rich anodic areas and the rust is deposited nearby.

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15
Q
  1. If 1080 steel is annealed by very slow cooling from 10000C to ambient temperature, its microstructure will consist almost solely of:

A. Austenite
B. Bainite
C. Cementite
D. Pearlite

A

D. Pearlite

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16
Q
  1. Steel can be strengthened by all of the following practices, EXCEPT:

A. Annealing
B. Quenching and tempering
C. Work hardening
D. Grain refinement

A

A. Annealing

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17
Q
  1. Intrinsic silicon becomes extrinsically conductive, with electrons as majority carriers when doped with which of the following?

A. Antimony
B. Boron
C. Germanium
D. Aluminum

A

A. Antimony

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18
Q
  1. The linear portion of the stress – strain diagram of steel is known as the:

A. Modulus of elasticity
B. Plasticity
C. Irreversible range
D. Elastic range

A

D. Elastic range

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19
Q
  1. Imperfections within metallic crystal structures may be all of the following, EXCEPT:

A. Lattice vacancies or extra interstitial atom
B. Ion pairs missing in ionic crystals
C. Displacement of atoms of interstitial sites
D. Linear defects, or slippage dislocations caused by shear

A

B. Ion pairs missing in ionic crystals

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20
Q
  1. A steel numbered SAE – AISI, C1035 when not rolled and contains 0.60% to 1.30% carbon and used when extra hardness is required.

A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Very high carbon steel

A

C. High carbon steel

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21
Q
  1. Which of the following alloying elements used in making high speed steel?

A. Molybdenum
B. Nickel
C. Manganese
D. Silicon

A

A. Molybdenum

22
Q
  1. Which of the following alloying used in springs to make more reliant?

A. Silicon
B. Tungsten
C. Hardness and resistance
D. Nickel

A

A. Silicon

23
Q
  1. It refers to that property in steel which resist indention or penetration. It is usually expressed in forms of the area of an indention made by a special ball under a standard load or the depth of a special indentor.

A. Hardness
B. Ductility
C. Malleability
D. Wear resistance

A

A. Hardness

24
Q
  1. The distance from a point on a screw thread to a corresponding point on an adjacent thread, measured parallel to the axis.

A. Pitch
B. Lead
C. Thread
D. Crest

A

A. Pitch

25
Q

75 The top surface joining the two sides of a thread.

A. Pitch
B. Lead
C. Lead
D. Space

A

B. Lead

26
Q
  1. The amount of variation permitted in the size of a part. It is the difference between the limits of maximum and minimum dimensions of a given part. It may be expressed at plus, minus or as both plus and minus.

A. Tolerance
B. Limit
C. Variation
D. Clearance

A

A. Tolerance

27
Q
  1. The instrument used to reshape a grinding wheel that is grooved or out of round is called a:

A. Wheel aligner
B. Wheel emery
C. Wheel dresser
D. Wheel cutter

A

C. Wheel dresser

28
Q
  1. The instruments used to remove old packing from packing glands and stuffing boxes are called:

A. Packing tools
B. Gland box cleaners
C. Packing bits
D. Packing screws

A

A. Packing tools

29
Q
  1. When working on bearings and checking for high spots, it is customary to apply what?

A. White lead
B. Dykem blue
C. Red lead
D. Prussian blue

A

D. Prussian blue

30
Q
  1. When a metal is cold worked, all of the following generally occur, EXCEPT:

A. Ductility decreases
B. Grains become equal – axed
C. Tensile strength increases
D. Slip or twinning occurs

A

B. Grains become equal – axed

31
Q
  1. Hard water is water, which contains soluble salts of which of the following elements

A. Sodium
B. Sulfur
C. Calcium
D. Chlorine

A

C. Calcium

32
Q
  1. Which of the following metals has the highest specific heat capacity at 100oC?

A. Aluminum
B. Bismuth
C. Copper
D. Iron

A

A. Aluminum

33
Q
  1. Aluminum pistons are either cast or

A. Ground
B. Forged
C. Pressed
D. Welded

A

B. Forged

34
Q
  1. Which of the following gasket materials should be used on a Freon system?

A. Metallic
B. Asbestos
C. Rubber
D. A and B

A

D. A and B

35
Q
  1. Valves and piping in an ammonia system are made of

A. Iron
B. Brass
C. Copper
D. Bronze

A

A. Iron

36
Q
  1. The non ferrous alloy corrodes in ammonia is

A. Copper
B. Bronze
C. Brass
D. All of these

A

D. All of these

37
Q
  1. What is used in the main condenser to control electrolysis?

A. Brass plate
B. Aluminum plate
C. Zinc plates
D. Bronze plate

A

C. Zinc plates

38
Q
  1. Which of the following types of packing would be used on steam joints?

A. Asbestos
B. Neoprene
C. Metallic
D. A or C

A

D. A or C

39
Q
  1. A classification of iron ore which contains 72.5% iron when pure and the remaining percentage are impurities.

A. Hematite
B. Magnetite
C. Limanite
D. Siderite

A

B. Magnetite

40
Q
  1. The process applied to iron pipe, which retards corrosion, is called

A. Galvanizing
B. Annealing
C. Soldering
D. Tinning

A

A. Galvanizing

41
Q
  1. Which of the following represents manganese steel?

A. 13XX
B. 40XX
C. 50XX
D. 10XX

A

A. 13XX

42
Q
  1. A scriber is made from what steel?

A. Carbon steel
B. Cold rolled steel
C. Tool steel
D. Hot-rolled steel

A

C. Tool steel

43
Q
  1. Which of the following iron ore also known as “brown hematite” or ferric oxide a yellowish brown powder?

A. Hematite
B. Magnetite
C. Limanite
D. Siderite

A

C. Limanite

44
Q
  1. It is another kind of furnace cast iron is remelted to make into cast iron. The furnace is charges with layers of coke and pig iron plus scrap iron.

A. Open-hearth furnace
B. Electric furnace
C. Cupola
D. Bessemer

A

C. Cupola

45
Q
  1. A furnace which consists of blowing a stream of air through a molten mass of iron pig. A stream of air is turned on through the wind box and enters the converter at the bottom. Manganese, carbon and other elements of varying amounts are added to produce steel which is then poured and solidifies.

A. Open-hearth furnace
B. Electric furnace
C. Cupola
D. Bessemer

A

D. Bessemer

46
Q
  1. A furnace similar to open-heart. The principal difference is the method of heating the charged. It is used in producing quality of steels because melting and refining is closely controlled.

A. Closed-heart furnace
B. Electric furnace
C. Cupola
D. Bessemer

A

B. Electric furnace

47
Q
  1. It is the process of reheating or drawing of metal that has been hardened to a comparatively low temperature in order to relieve the hardening strain and
    increase the toughness of the steel.

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

A

A. Tempering

48
Q
  1. Case hardening is the process of hardening the outer surface of the metal and inner parts are soft. What percentage of carbon content that this type of
    hardening is allowed?

A. 15% and above
B. 10 to 20% only
C. less than 5% only
D. Any of the following

A

A. 15% and above

49
Q
  1. A steel numbered SAE – AISI, C1018 and contains 0.10% to 0.30% carbon.

A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Very high carbon steel

A

A. Low carbon steel

50
Q
  1. A steel numbered SAE – AISI, C1035 when not rolled and contains 0.30% to 0.60% carbon.

A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Very high carbon steel

A

B. Medium carbon steel

MD ELEMENTS PER 50 (10 decks)

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