Machine design terms
Short Description
Machine design of shafts, gears, belts and clutches...
Description
1. What is the lightest known metal?
A. Mercury B. Steel C. Chromium D. Aluminum
2. Material having high electrical resistance and should not be used as conductor. A. Magnesium B. Copper
C. Nickel D. Iron
3. The property that characterizes a materials ability to be drawn into a wire is known as A. Plasticity B. Elasticity
C. Ductility D. Utility
4. Stress relieving is also _____ for the purpose of reducing internal stress of steel material/metal. A. Quenching B. Normalizing
C. Tempering D. Drawing
5. A carbon content in the range of ____ in steel readily responds to heat treatment. A. 0.35 to 0.40% C B. 0.28 to 0.30% C
C. 0.18 to 0.25% C D. 0.12 to 0.15% C
6. It indicates how many times a volume of material is heavier than an equal volume of water. A. Specific gravity B. Specific volume
C. Specific weight D. Specific density
7. Nickel – chromium – molybdenum steel designation SAE ______. A. 81xx B. 74xx
C. 94xx D. 64xx
8. Moment of inertia is also called
A. Modulus of elasticity B. Weep strength C. Radius of gyration D. None of the above
9. It is hardening treatment whereby a cast metal is being heated to a very high temperature then suddenly subject to rapid cooling to improve hardenability of wear resistance is called A. Annealing B. Normalizing C. Tempering
D. Quenching
10. A good general purpose deoxidizer which promotes fined grain in steel A. Copper B. Magnesium
C. Molybdenum D. Silicon
11. Treatment process that produces a residual compressive stress at the surface and residual tension on the inside that results in considerable increase in fatigue strength for members on torsion/bending is known A. Partial quenching B. Heavy oil quenching C. Quenching
D. Shallow quenching
12. The flux that should be provided in soldering electrical connection or commutator wires as it tends to corrode the connections. A. Sal ammoniac
B. Zinc chloride C. Stearin D. Acid fluxes
13. The characteristics of tool steel sustain shocks and major impacts is due to its A. Toughness B. Stiffness
C. Ductility D. Machinability
14. The application of electrical current to the corrosion circuit to counter the corrosion reaction is called A. Cathodic protection B. Sacrificial anodes method
C. Chemical corrosion process D. Galvanic action
15. A major component of cast steel is A. Silicon B. Iron C. Manganese D. Chromium
16. Normally, cast iron contains 2% carbon or more and silicon in the range of ____% A. 1 to 3 B. 1 to 4
C. 2 to 3 D. 1 to 6
17. The material for engine radiation is usually made of _____. A. Yellow brass B. Silicon brass
C. Admiralty brass D. Navy brass
18. A problem by-product used as an electrode in an electric arc furnace melting operation is called A. Anthracite coke B. Foundry coke
C. Graphite electrodes D. Bituminous coke
19. Which of the following does not effect the tensile strength of steel? A. Sulfur B. Cobalt
C. Phosphorous D. Boron
20. Alloy steel axle under repeated load/stress will eventually fail if the load/stress is above the endurance for the steel under consideration. The endurance limit of the steel is A. Equal to the allowable stress of the module of elasticity B. Equal to half of the ultimate strength C. Equal to module of elasticity
D. Equal to 80% of the elastic limit
21. Mirror finish has surfaces of ____rms. A. 1 B. 2 to 8 C. 1 to 3 D. 2 to 5
22. Chromium steel to include heat and corrosion resistant designation A. SAE 56xx B. SAE 511xx
C. SAE 61xx D. SAE 9xx
23. Non – metallic material of high melting temperature being used as furnace lining. A. Quartz bricks B. Refractories
C. Silica sand D. Dolomile clay bricks
24. In greater quantity, this element is harmful to the molten ferrous metal. A. Silica B. Aluminum
C. Oxides D. Sulfur
25. Silicon manganese steel designation, SAE___.
A. 72xx B. 40xx C. 92xx D. 9xx
26. Cold drawing is also called _____.
A. Hard drawn B. Oxidized steel C. Cold lap steel D. Strain hardening
27. The brittleness in steel at elevated temperature is known as A. Hard drawn B. Cold lap
C. Red shortness D. Residual stresses
28. Material may be stretched and still returns to its former form/condition upon release of force is called A. Plasticity B. Modulus of elasticity
C. Ductility D. Elastic limit
29. What is SAE specification number of molybdenum chromium nickel? A. 48xx B. 47xx
C. 46xx D. 45xx
30. Galvanized iron is term referring to iron coated with _____. A. Aluminum B. Tin
C. Zinc D. Manganese
31. A metal, which has high electrical conductivity but should not be used for high temperature. A. Silicon B. Zinc
C. Chrome alloy D. Carbide
32. It improves red hardness of steel. A. Chromium B. Cobalt C. Boron D. Lead
33. What is the SAE specification number of molybdenum? A. SAE 2xxx B. SAE 3xxx C. SAE 4xxx D. SAE 5xxx
34. Which does not belong to the group? A. SAE B. AISI C. SEA D. ASTM
35. It is the ability of the material to resist deformation under stress. A. Plasticity B. Stiffness
C. Toughness D. All of the above
36. Which of the following is not a structural class of steel?
A. High speed steel B. Tool and die C. Low carbon D. High carbon
37. Continuous stretching under load even if the stress is less than the yields point is known as A. Plasticity B. Elasticity
C. Creep D. Ductility
38. Killed steel is always associated with A. Silicon B. Manganese C. Phosphorous D. Sulfur
39. The good deoxidizer in steel melting
A. Manganese B. Silicon C. Aluminum D. All of the above
40. Good stabilizer in stainless steel is
A. Columbium B. Titanium C. Tantalum D. All of the above
41. Metals are conductive because
A. The electrons are loosely bound to the nuclei and therefore mobile B. Having characteristics luster
C. They are on the left side of the periodic table D. They have extra electrons as exhibited by normally possible balance state
42. The yield strength of a rectangular yellow brass 65 to 70% Cu, 30 to 35% Zn can be increase/improve by ______. A. Cold working B. Tempering
C. Shill casting D. Heat treatment
43. Used as cast condition steel casting with carbon content less than ____ % C. A. 0.26 B. 0.15 to 0.18
C. 0.20 D. 0.25
44. Liners are normally made of
A. Cast iron B. Alloyed bronze C. Alloyed steel D. Alloyed aluminum
45. A furnace used in melting of non – ferrous metals is called A. Cupola furnace B. Crucible furnace
C. Induction furnace D. Normalizing furnace
46. A furnace used in melting ferrous metalss
A. Annealing furnace B. Tempering furnace C. Induction furnace D. Normalizing furnace
47. All are associated with standard material specified except A. American Iron and Steel Institute B. Society of Automotive Engineers
C. Southeast Asia Iron and Steel Institute D. American Society for Testing Material
48. The ability of the material to be deformed considerably without rupture is called A. Malleability B. Elasticity
C. Ductility D. Plasticity
49. Permanent deformation or strain may occur without fracture is called A. Malleability B. Elasticity
C. Ductility D. Plasticity
50. An alloy that improves strength of steel at high temperature application. A. Tungsten B. Molybdenum
C. Chromium D. All of the above
1. Metal that assists lubrication or lubricant in itself. a. zinc b. antimony c. Babbitt d. lead
2. The smallest area at the point of rupture of a tensile specimen divided by the original area is called. a. Percentage elongation
b. Izod test c. Charpy test
d. Percentage reduction of area
3. All are associated with the grade of steel except. a. SAE 43xx b. SAE 13xx c. SAE 10xx d. SAE 74xx
4. Cold working of steel plates make the metal a. tougher b. More detail c. harder d. More malleable
5. The property that characterizes the material’s ability to be drawn into a wire called a. ductility
b. Thermal conductivity c. Tensile strength
d. Endurance limit
6. Normal stress relieving temperature for cast steel is a. 200 to 350 F b. 400 to 500 F c. 300 to 400 F d. 450 to 550 F
7. Most effective alloying element for reducing brittleness of steel at very low temperature. a. manganese
b. molybdenum c. silicon
d. nickel
8. Ordinary steel begins to lose strength and elasticity significantly of about what temperature. a. 900 – 1000 F
b. 800 – 900 F c. 700 – 850 F
d. 600- 700 F
9. For a high corrosion resistant stainless steel what minimum chromium content is required? a. 8%
b. 4.3% c. 1.1%
d. 5.8%
10. A material that should be avoided in constructing wood pattern is _____. a. Sap wood
b. Klin dried wood c. Heart wood
d. Core portion of wood
11. The gradual chemical reaction by other substance such that the metal is converted to an oxide or other compounds. a. corrosion
b. cheeping c. rusting
d. weathering
12. What is the property of a material, which resist forces acting to pull the material apart? a. Shear strength
b. Tensile strength c. Torsional strength
d. Compressive strength
13. What is the difference between brass and bronze? a. Brass is composed of copper and zinc whole bronze is composed of copper and tin.
b. Brass is composed of copper and zinc while bronze is basically copper and tin plus non-ferrous alloy such as manganese, aluminum and chromium. c. Bronze is reddish in color while brass is a mixture of copper and antimony.
d. Bronze is mostly an alloy of copper and tin while brass is a mixture of copper and antimony.
14. A liquid metal is called ______. a. mercury b. lead c. zinc d. aluminum
15. Which of the following elements when large quantity is harmful to the ferrous metal? a. sulfur
b. silicon c. zinc
d. aluminum
16. It has molybdenum alloy except _____. a. SAE 43xx b. SAE 41xx c. SAE 6xxx d. SAE 5xxx
17. Cast alloy steel for very high temperature application. a. Manganese – nickel steel casting b. High chrome steel casting c. Chrome – nickel steel casting d. High manganese casting
18. What heat treatment process can cast steel materials of high chrome high manganese etc. be subjected for the purpose of machining process? a. annealing
b. tempering c. normalizing
d. quenching
19. Galvanize steel plate is a. aluminum b. tin c. zinc d. manganese
20. Major components of bronze casting is a. copper b. manganese c. zinc d. lead
21. Alloy steel known for its resistance to corrosion, abrasion and wear that is usually ideal for mill grinding of ore in cement and concentrator application. It is usually combined with molybdenum to increase the depth hardening
a. Manganese chromium steel b. Chromium – moly steel
c. Chromium – nickel – moly steel d. Manganese – moly steel
22. Commonly utilized/cheapest shaft material available in the market with carbon content of 0.28 to 0.34? a. SAE 4132
b. SAE 4320 c. SAE 1030
d. SAE 4130
23. Heating of metal above the critical temperature and then cooling slowly usually in the furnace to reduce the hardness and improve the machinability is called. a. normalizing b. annealing c. tempering d. quenching
24. It is hardening treatment whereby a cast metal is being heated to a very high temperature then suddenly subjected to rapid cooling to improve hardenability or wear resistance is called a. normalizing b. tempering c. annealing d. quenching
25. SAE steel that responds to heat treatment. a. SAE 1060 b. SAE 1117 c. SAE 1030 d. SAE 1020
26. A form of correction that develop on a highly localized area on a metal surfaces. a. crevice
b. erosion c. galvanic
d. spitting
27. The deterioration of organic coating characterized as completely ______. a. chalking
b. rusting c. checking
d. fritting
28. The temperature above which the alloy is liquid and will run is known as ____. a. Melting point
b. Flow point c. Pour point
d. Dew point
29. It refers to any layer or deposit of extraneous material on the heat – transfer surface. a. Low line
b. Pressure drop c. fouling
d. scaling
30. Steel containing large amount of mild nickel and chromium. a. Carbon steel b. Stainless steel c. Alloy steel d. Cast steel
31. The corrosion of iron or iron – base alloys. a. rusting b. crazing c. chalking d. fritting
32. A corrosion occurs within or adjacent to a crevice formed by contact with another piece of the same or another metal is called _____. a. pitting
b. galvanic c. erosion
d. crevice
33. An alloy of tin, copper, antimony, or sometimes lead. a. Gold b. Babbitt c. aluminum d. Cast iron
34. The cheapest and most abundant engineering material is ______. a. aluminum b. steel c. Cast iron d. babbitt
35. They are usually steel or steel casting a. Mild steel b. Carbon steel c. Fire box steel d. Drop – forge - dies
36. An iron has physical properties closely resembling those of mild steel is called. a. Malleable cast iron
b. Malleable iron c. White iron
d. Gray iron
37. An iron in which most of the carbon is chemically combined with the iron is called a. Cast iron
b. Gray iron c. White iron
d. Malleable iron
38. Which of the following metals is non-magnetic? a. Manganese steel b. Cast steel c. Alloy steel d. Cast iron
39. Which of the following is not a kind of cast iron? a. Gray iron b. White iron c. Malleable iron d. Lead iron
40. Which of the following is not used to temper steel? a. Oil bath b. brine/ salt bath c. Steam bath d. Water bath
41. Which of the following metal is easy to chisel? a. Alloy steel b. Manganese steel c. Stainless steel d. Cast iron
42. Ferrous metals contain a relatively large amount of _______. a. manganese b. carbon c. sulfur d. phosphorous
43. Which of the following is not a classification of iron core? a. siderite b. hematite c. sulfurite d. magnetite
44. Stainless steel is obtained principally by the use of which of the alloying elements? a. chromium
b. nickel c. carbon
d. tungsten
45. Which of the following metals will respond to heat treatment? a. Cast iron b. Wrought iron c. Medium carbon steel d. Low carbon steel
46. The property of steel, which resist indentation on penetration is called a. hardness b. elasticity c. ductility d. None of the above
47. The ability of metal to stretch band or twist without breaking or cracking is called a. elasticity
b. ductility c. brittleness
d. plasticity
48. The ability of the material to return to its original state after being elongated or distorted when the forces are released is called a. elasticity
b. ductility c. plasticity
d. creep
49. material, usually ceramics employed where resistance to very high temperature is required, as for furnace linings and metal melting pots is called a. bricks b. insulator c. refractories d. clay
50. Any material that retard the flow of electricity, used to prevent or escape of electric current from conductors. a. bricks
b. insulators c. refractories
d. composite
ALLOYS BY HEATING THEN BELOW THE MELTING POINT IN CONTACT WITH A CARBONACEOUS SUBSTANCE A.
Carbonizing
B.
Normalizing
C.
Mar tempering
D.
Hardening
2. A SPECIAL METAL FORMED WHEN TWO OR MORE METALS ARE MELTED TOGETHER. A.
Monel
B.
Alloy
C.
Solder
D.
Hastalloy
3. SUBJECTING A SUBSTANCE TO A HIGH TEMPERATURE BELOW THE FUSION POINT USUALLY TO MAKE IT FRIABLE A.
Calcination
B.
Fusion
C.
Boiling
D.
Super heating
CARBON AND/ OR HYDROGEN FOR CHEMICAL OXIDATION TO PRODUCE EXOTHERMALLY, WORTHWHILE QUANTITIES OF HEAT. A.
Lubrication
B.
Graphite
C.
Grease
D.
Fuels
5. THE PRINCIPAL MATERIAL USED IN HIGH PRODUCTION METAL WORKING TOOLS. A.
Hyper-Eutectoid
B.
High speed steel
C.
Lead
D.
High speed carbon
TREATMENT AND MOST COMMONLY CONSIST OF HEATING THE METAL UP TO NEAR MOLTEN STATE AND COOLING IT VERY SLOWLY.
A.
Annealing
B.
Indexing
C.
Knurling
D.
Soldering
7. THE OPERATION OF COOLING A HEATED PIECE OF WORK RAPIDLY BY DIPPING IT IN WATER, BRINE OR OIL.
A.
Quenching
B.
Annealing
C.
Tempering
D.
Normalizing
8. A METALLIC ELEMENTS AND ONLY METAL THAT IS LIQUID AT ORDINARY TEMPERATURE.
A.
Aluminum
B.
Mercury
C.
Zirconium
D.
ZInc
9. A METALLIC OF COPPER - TIN ALLOY.
A.
Aluminum
B.
Brass
C.
Bronze
D.
Chromium
10. AN ALLOY OF COPPER AND ZINC.
A.
Aluminum
B.
Brass
C.
Bronze
D.
Chromium
11. WHICH OF THE FOLLOWING IS NOT A CLASSIFICATION OF IRON ORE?
A.
Hematite
B.
Magnetite
C.
Sulfurite
D.
Siderite
12. A SOFT METAL, KNOWN SINCE ANCIENT TIMES AS A PRECIOUS METAL WHICH ALL MATERIAL VALUES ARE BASED.
A.
Solids
B.
Bronze
C.
Gold
D.
Austenite
13. AN AMORPHOUS SOLID MADE BY FUSING SILICA WITH A BASIC OXIDE.
A.
Pearlite
B.
Rock
C.
Silicon
D.
Glass
14. A FINE GRAIN SALTY SILICA ROCK USED FOR SHARPENING EDGE TOOLS.
A.
Eutectoid
B.
Austenite
C.
Oilstone
D.
Pearlite
15. A HIGHLY TRANSPARENT AND EXCEEDINGLY HARD CRYSTALLINE STONE OF ALMOST PURE CARBON IS CALLED.
A.
Gold
B.
Diamond
C.
Bronze
D.
Crystalline
16. THE COMMON DEOXIDIZER AND CLEANSER OF STEEL FORMING OXIDES AND SULFATE THAT ARE CARRIED OFF IN THE SLAG.
A.
Manganese
B.
Carbon
C.
Tungsten
D.
Sulfur
17. AN ALLOY COPPER, TIN AND SMALL AMOUNT OF PHOSPHOROUS.
A.
Chromium
B.
Bronze
C.
Brass
D.
Aluminum
18. THE MATERIAL USED IN HIGH SPEED PROCESSES.
A.
High speed steel
B.
Chromium
C.
Cast iron
D.
Carbon steel
19. A MAT’L THAT CAN WEAR AWAY A SUBSTANCE SOFTER THAN ITSELF IS CALLED.
A.
Abrasive
B.
Corrosive
C.
tungsten
D.
alloy
20. THE PROCESS OF HEATING A PIECE OF STEEL TO A TEMP. WITHIN OR ABOVE CRITICAL RANGE AND COOING RAPIDLY.
A.
Normalizing
B.
Hardening
C.
annealing
D.
tempering
PRODUCING CHECKERS ON THE SURFACE OF A PIECE BY ROLLING CHECKERED DEPRESSION INTO THE SURFACE IS CALLED.
A.
Knurling
B.
hemming
C.
breading
D.
embossing
USUAL HARDENING TEMP. KEEPING IT AT THE HEAT FOR ½-2HRS. THEN COOLING SLOWLY, PREFERABLY IN A FURNACE
A.
Broaching
B.
Quenching
C.
normalizing
D.
Annealing
23. A MANGANESE STEEL CONTAINING APPROX. 0.20% CARBON.
A.
SAE 1320
B.
SAE 1230
C.
SAE 2340
D.
SAE 4230
COOLING TO BELOW THAT RANGE IN STILL AIR AT ROOM TEMP. TO PRODUCE UNIFORM STRUCTURE OF THE METAL TERMED AS.
A.
annealing
B.
hardening
C.
normalizing
D.
tempering
FOR A SUITABLE TIME FOR THE PURPOSE OF REDUCING INTERNAL RESIDUAL STRESSES IS CALLED.
A.
annealing
B.
hardening
C.
tempering
D.
Stress relieving
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
27. THE EFFECT OF ALLOYING ZINC TO COPPER.
A.
To increase hardness
B.
To increase strength and ductility if added up to 10-30%
C.
To impart free-machining properties
D.
To improve hardness and strength
28. POLYESTERS BELONG TO HE GROUP OF.
A.
phenotics
B.
Thermoplastic plastics
C.
Thermosetting plastics
D.
All of the above
29. THE IMPERFECTION IN THE CRYSTAL STRUCTURE OF METAL IS KNOWN AS.
A.
dislocation
B.
Fracture
C.
impurity
D.
slip
30. THE MOST IMPORTANT ELEMENT THAT CONTROLS THE PHYSICAL PROPERTIES OF STEEL IS
A.
carbon
B.
chromium
C.
silicon
D.
tungsten
31. THE PROCESS COMMONLY USED OVER THERMO-PLASTIC MAT’LS IS.
A.
Cold forming
B.
Die casting
C.
Injection molding
D.
Shell molding
32. A SPACE LATTICE FOUND IN ALPHA-IRON IS CALLED.
A.
Body centered cubic space lattice
B.
Close packed hexagonal space lattice
C.
Face centered cubic space lattice
D.
None of the above
33. A UNIT CELL THAT CONTAINS NINE ATOMS IS KNOWN AS THE.
A.
Body centered cubic space lattice
B.
Close packed hexagonal space lattice
C.
Face centered cubic space lattice
D.
None of the above
34. A KNOOP INDENTER IS A DIAMOND GROUND TO A ___________.
A.
Cylindrical from
B.
Needle form
C.
Prismoidal form
D.
Pyramidal form
35. WHICH OF THE FOLLOWING TIMBER IS USED FOR SPORT GOODS?
A.
Deodar
B.
Mahogany
C.
Mulberry
D.
Sal
36. SUPER CONDUCTORS
A.
Are non-crystalline
B.
Are the purest form of metal
C.
are the densest metals without voids
D.
Exist at temp. below 10 degrees K
37. SELECT THE ONE THAT HAS HIGHEST SPECIFIC GRAVITY.
A.
aluminum
B.
brass
C.
High carbon steel
D.
lead
38. FOR HEAVY LOADS IN AIRCRAFT BEARINGS THE MATERIALS USED WITH LEAD TO REDUCE THE RISK OF SEIZURE IS.
A.
iron
B.
silver
C.
tin
D.
zinc
39. AGE-HARDENING IS RELATED WITH.
A.
Cast iron
B.
Duralumin
C.
German silver
D.
Stainless steel
40. WHICH OF THE FOLLOWING HAS HIGHEST SPECIFIC STRENGTH OF ALL STRUCTURAL MATERIALS?
A.
Chromium alloys
B.
Magnesium alloys
C.
Titanium alloys
D.
None of the above
41. ADDITION OF LEAD AND BISMUTH TO ALUMINUM WILL PRODUCE
A.
An improvement of casting characteristics
B.
An improvement of corrosion resistance
C.
One of the best known age and precipitation hardening system
D.
An improvement in machinabiity
42. HASTALLOY CONTAINS
A.
Aluminum and nickel
B.
Copper and aluminum
C.
Nickel and copper
D.
Nickel and molybdenum
43. IN COMPRESSION, A PRISM OF BRITTLE MATERIAL WILL BREAK
A.
By forming a bulge
B.
By shearing along oblique plane
C.
In a direction along at the direction of load
D.
Into large number of piece
44. THE MAXIMUM HARDENABILITY OF ANY STEEL DEPENDS ON _______.
A.
The alloying element present
B.
The carbon content
C.
The chemical composition
D.
The grain size
45. STEEL WITH 0.8% CARBON AND 100% PEARLITE IS KNOWN AS
A.
austenite
B.
eutectoid
C.
Hyper-eutectoid
D.
solidous
46. SUBSTANCE THAT CAN INCREASE THE MACHINABILITY OF STEEL
A.
phosphorous
B.
Phosphorous and aluminum
C.
Silicon and sulfur
D.
Sulfur, graphite and aluminum
47. COMPRESSIVE STRENGTH OF GRAY CAST IRON IN TONS PER CM^2 IS OF THE ORDER OF
A.
3-5
B.
5-7
C.
7-10
D.
15-22
48. THE PRESENCE OF SULFUR IN PIG IRON MAKES_______.
A.
It brittle
B.
It easily machinable
C.
It hard
D.
The casting unsound
49. THE HARDNESS OF STEEL INCREASE IF IT CONTAINS _______.
A.
Austenite
B.
Pearlite
C.
Stalactite
D.
Martensite
50. WHICH ONE IS DIFFERENT FROM THE GROUP?
A.
Cyaniding
B.
Nitriding
C.
Flame hardening
D.
Electroplating
CONTENT SURFACE OF STEEL BY EXPOSING IT TO HOT CARBONACEOUS MATERIAL ABOVE THE TRANSFORMATION OF 1650 TO 1750F.
A.
Carbonitriding
B.
Case Hardening
C.
Carburizing
D.
Electroplating
2. IN THE SAE IDENTIFICATION CODE OF STEEL SHAFTING THE 3 RD AND 4TH DIGITS REPRESENTS THE CONTENT OF
A.
% of manganese in the steel
B.
% of alloy
C.
% of carbon content
D.
% of chronium in the steel
3. IT IS ASSOCIATED WITH NICKEL STEEL.
A.
Magnesium
B.
Lead
C.
Columbium
D.
Tin
4. A NON-MAGNETIC METAL IS
A.
Nodular iron
B.
Manganese steel
C.
Tungsten-molybdenum steel
D.
All of these
5. IN SMALL QUANTITY THIS ALLOY IS EFFECTIVE FOR IMPROVEMENT STRENGTH AT HIGH TEMPERATURE
A.
Chronium
B.
Manganese
C.
Selenium
D.
Molybdenum
6. THE TYPE OF CARBON AND ALLOY USED IN PRODUCTION OF PRECISION WORK TOOLS.
A.
Chrome-manganese
B.
Titanium
C.
High speed steel
D.
Chrome-molybdenum
7. IN POWDER METALLURGY, THE PROCESS OF HEATING THE COLD PRESSED METAL POWDER IS CALLED
A.
deposition
B.
granulation
C.
precipitation
D. sintering
8. ELECRO-FORMING IS ESPECIALLY VALUABLE FOR
A.
Decorative items
B.
Good conductors of electricity
C.
Non-ferrous components
D. Thin walled parts requiring a high order of accuracy and internal surface finish
9. ALUMINUM ALLOYS FOR PRESSURE DIE CASTING
A.
Must possess considerable fluidity
B.
Must not be free from shortness
C. Must have iron a one of the constituents D. Must be light
10. IN CARBON STEEL CASTINGS
A.
The percentage for alloying elements is controlled
B.
The percentage of carbon is between 1.7% to 2%
C. The percentage of carbon is less than 1.7% D. None of the above
ON CAST IRON AND ITS PRESSURE IN CAST IRON REDUCES THE ABILITY OF THE IRON TO RETAIN CARBON IN CHEMICAL COMBINATION.
A.
Aluminum
B.
Carbon
C. Silicon D. Sulfur
12. CYANIDING IS THE PROCESS OF
A.
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
B.
Dipping steel in cyanide bath
C. Obtaining cyanide salts D. Reading steel surface with cyanide salts
13. AN ENGINEER’S HAMMER IS MADE OF
A.
Cast iron
B.
High speed steel
C. Forged steel D. Mild steel
14. A COLD CHISEL IS MADE OF
A.
Cast iron
B.
High carbon steel
C. High speed steel D. Mild steela
15. EUTECTOID STEEL THE PERCENTAGE OF CARBON IS
A.
0.02%
B.
0.30%
C. 0.03% D. 0.80%
16. MACHINING PROPERTIES OF STEEL CAN BE IMPROVED BY ADDING
A.
chromium, nickel
B.
silicon, aluminum, titanium
C. sulfur, lead, phosphorous D. vanadium, aluminum
17. THE ABILITY OF MATERIAL TO ABSORB ENERGY WHEN DEFORMED ELASTICALLY AND TO RETURN IT WHEN UNLOADED IS KNOWN AS
A.
creep
B.
Fatigue strength
C. hardness D. resilience
18. A DUCTILE FRACTURE IS CHARACTERIZED BY
A.
Appreciable plastic deformation prior to propagation of crack
B.
Fragmentation into more than two pieces
C. Negligible deformation D. Rapid rate for crack propagation
DUCTILITY IS DECREASED ON HEATING AT A RELATIVELY LOW TEMPERATURE AFTER COLD WORKING.
A.
clustering
B.
Screw dislocation
C. Solid solution hardening D. Strain aging
20. IF A MATERIAL RECOVERS ITS ORIGINAL DIMENSIONS, WHEN THE LOAD IS REMOVED IT IS CALLED
A.
annealed
B.
brittle
C. elastic D. plastic
21. A BODY HAVING IDENTICAL PROPERTIES ALL OVER IS CALLED
A.
ductile
B.
elastic
C.
Homogeneous
D.
Isentropic
22. POINTS OF ARREST OF IRON CORRESPOND TO A.
Stages at which allotropic forms of change
B.
Stages at which further heating does not increase temperature for sometime
C.
Stages at which properties do not change with increase in temperature
D.
There is nothing like points of arrest
23. Delta iron occurs at
a. Temperature above melting point
b. Temperature between 1400°C and 1539°C c. Temperature between 1000°C and 1400°C d. Room temperature
24. Gamma iron exists at the temperature range
a. Between 910°C and 1400°C
b. Between 1400°C and 1539°C c. Near melting point d. Room temperature
25. Ferromagnetic alpha iron exists in temperature range of
a. Below 723°C
b. 700 – 910°C c. 1000 – 1440°C d. 1400 – 1539°C
26. The mould for casting ferrous materials in continuous casting process is made of
a. Low carbon steel b. Medium carbon steel c. High carbon steel d. Copper
27. A silver refers to
a. The pointed location spot silver plated
b. The point on an instrument dial a reading beyond which may be dangerous c. The temperature at which silver melts d. The temperature of equilibrium between solid silver and liquid silver at normal atmospheric pressure
28. Piston compression rings are made of
a. aluminum
b. bronze c. Cast iron d. White metal
29. One of the materials used for making surface plate is a. brass
b. granite c. Stainless steel d. wood
30. Cast iron contains _____ % carbon.
a. 0.05 to 0.30
b. 0.30 to 0.60 c. 0.60 to 1.30 d. 2 to 4
31. Tungsten in high speed steel imparts which of the following characteristics?
a. Corrosion resistance b. ductility c. Red hardness d. Shock resistance
32. High carbon steel has a carbon content of
a. 0.5 to 1%
b. 0.8 to 2% c. 1 to 3% d. 2 to 4%
33. During tensile testing on a specimen cup and cone formation is observed with _________.
a. Cast iron b. Cast steel c. glass d. Mild steel
34. Kerosene is used as coolant, while machining which material?
a. aluminum
b. Cast iron c. Mild steel d. Stainless steel
35. One of the following materials is commonly used for bearings.
a. Aluminum
b. Gun metal c. Steel d. Zinc
36. Babbitt metal is an alloy of
a. Tin, copper, antimony and head
b. copper, zinc, and tin c. Iron and tungsten d. Tin, copper, lead and phosphorus
37. The bed of a machine tool is normally made of
a. Alloy steel
b. Cast iron c. Medium carbon steel d. Mild steel
38. The main constituent molding sand is
a. carbon
b. clay c. graphite d. silicon
39. Cobalt is added to high speed steel to
a. Increase ductility
b. Increase fatigue strength c. Increase hot hardness d. Increase wear resistance
40. During cold, working metals are worked
a. Below room temperature
b. Below their melting point c. Below their recrystallization temperature d. Below 200 C
41. Copper is annealed by healing to a cherry red color and
a. Dousing in cold water
b. Cooling slowly in water c. Dousing in oil d. Dousing in hot water
42. Tool steel can be hardened by
a. Heating red hot and plunging into water
b. Heating red hot and cooling in a blast of dry air c. Heating red hot and plunging into linseed or cotton seed oil d. Any of the above, depending on type and use
43. The purpose of annealing is to make a metal
a. harder
b. Medium hard c. softer d. shiny
44. The purpose of tempering is to make the metal
a. harder
b. softer c. Less brittle d. More brittle
45. A scriber is made of
a. Carbon steel
b. cold-rolled steel c. hot-rolled steel d. Tool steel
46. Knurling is done to
a. Polish material b. Roughen material c. Sharpen the material d. Smoothen material
47. Muntz metal contains which of the following alloys?
a. copper-nickel
b. copper-zinc c. copper-tin d. copper-aluminum
48. A reinforced concrete beam is considered to be made up of
a. Clad material
b. Composite material c. Homogenous material d. heterogeneous
49. In testing a material for endurance strength it is subjected to
a. Static load
b. Impact load c. Dynamic load d. Completely reversed load
50. Which of the following is not a sound absorptive material?
a. Rug
b. Mirror c. Carpet d. Heavy drape
1. The ability of a substance to exist in more than one lattice form is known as a. Allotropy
b. Grain c. Crystallization
d. Diamagnetic
2. Properties, which describe the behavior of materials under the application of force, are called as a. Physical properties
b. Chemical properties c. Mechanical properties
d. Electrical properties
3. The amount of energy per unit volume, which the material will possess when subjected to the elastic limit stress is called a. Bulk modulus
b. Modulus of resilience c. Modulus of elasticity d. Modulus of rigidity
4. ____________ means the resistance to penetration. a. Hardness b. Strength c. Toughness d. Stiffness
5. __________ means the increasing hardness and strength by plastic deformation at temperature lower than the recrystallization range. a. Case hardening b. Strain hardening c. Nitriding d. Stiffness
6. The plastic deformation at temperature above the recrystallization temperature. a. Hot working
b. Cold working c. Normalizing d. Annealing
7. The plastic deformation at temperature below the recrystallization temperature. a. Hot working
b. Normalizing c. Annealing d. Cold working
8. A preliminary evaluation of the elevated temperature properties of materials may be secured by means of a a. Stress rupture test
b. creep c. Impact test d. Modulus of rupture
9. The temperature of which this decrease of impact energy occurs is called a. Recrystallization temperature
b. Transition temperature c. Rupture temperature d. Ultimate temperature
10. An intimate mechanical mixture of two or more phases having a definite composition and a definite freezing or melting point. a. Allotropy
b. Peritectic c. Eutectic d. Protectic
11. The science which deals with the preparation and application of metals and alloys. a. Manufacturing
b. Metalloids c. Metallurgy d. Refractories
12. A combination of minerals, which can be profitably mined. a. Gangue b. Metal c. Alloy d. Ores
13. The mechanical treatments by which the concentrations of ores is increased are called a. Gravity separation
b. Ore dressing c. Distillation d. Sintering
14. Process which involve the reduction of the metal from aqueous solutions by a. Pyrometallurgical processes
b. Electrometallurgical processes c. Hydrometallurgical processes d. Amalgamation process
15. Non-metallic materials of high melting temperature used in the construction of furnaces, crucibles and so forth are called. a. Refractories
b. Ceramics c. Insulations d. Grate
16. The flux and gangue when in proper proportions will have a melting temperature considerably lower than that of either one and the resulting combination is called a. Time b. Residue c. Slag d. Refractories
17. An iron-bearing slate or chart in the form of compact siliceous rock. a. Taconite
b. Hematite c. Magnetite d. Limonite
18. A mechanical mixture of very pure iron and a silicate slag. a. Bronze b. Brass c. Cast iron d. Wrought iron
19. An alloy of iron and carbon in which the carbon content does not exceed 1.7 per cent. a. Brass
b. Steel c. Babbitt d. Bronze
20. The structure formed when transformation occurs at temperature down to the knee of the curve. a. Pearlite
b. Bainite c. Martensite d. Limonite
21. The process of producing a hard surface in a steel having a sufficiently high carbon content to respond to hardening by rapid cooling of the surface. a. Flame hardening b. Induction hardening c. Cyaniding d. Carburizing
22. It is one in which some elements other than carbon has been added to improve or change the physical properties. a. Low carbon steel
b. Alloy steel c. Medium carbon steel d. High carbon steel
23. SAE 1020 steel is a carbon steel containing _____ percent carbon. a. 20%
b. 0.20% c. 10% d. 0.10%
24. SAE 2317 steel is a nickel-steel alloy containing ______ percent nickel. a. 2%
b. 3% c. 1% d. 7%
25. AISI C 1095 designates that it is a basic open earth carbon steel having ______ percent carbon. a. 5%
b. 9% c. 95% d. 0.95%
26. Molybdenum steels are painted ________. a. Green b. Blue c. Red d. Orange
27. Used for members of intricate shape that would be difficult to manufacture by other methods. a. Forging
b. Casting c. Extruding d. Hot working
28. AISI means a. American Iron and Steel Institute b. African Iron and Steel Institute c. Aluminum Iron and Steel Institute d. American Investment for Steel Industry
29. SAE means a. Society of American Engineers b. Society of Automotive Engineers c. Society of Australian Engineers d. Society of African Engineers
30. Which of the following metals increases the strength without sacrificing the ductility of the carbon steels. a. Brass
b. Nickel c. Bronze d. Copper
31. It serves as an excellent deoxidizing agent, and promotes the nitriding of steels. a. Aluminum
b. Boron c. Copper d. Brass
32. It is used to toughen and strengthen the steel, to reduce the grain size and to act as a cleanser and degasifier. a. Nickel
b. Boron c. Vanadium d. Molybdenum
33. Materials having a high percentage of alumina or steatite are known as a. Titanium
b. Vanadium c. Refractories d. Ceramics
34. It is a process of hardening the outer portion of the metal by prolonged heating free from contact with air while the metal is packed in carbon in the form of bone char, leather scraps, and charcoal.
a. Carburizing b. Cyaniding c. Nitriding d. Aging
35. The degree to which a material will deform before ultimate fracture. a. Brittleness
b. Ductility c. Malleability d. Plasticity
36. The property of a material that indicates its ability to transfer heat. a. Thermal conductivity
b. Electrical resistivity c. Thermal expansion d. Electrical conductivity
37. A group of heat-treatable cast iron with moderate to high strength, high modulus of elasticity, goal machinery and good resistance carbon. a. Gray iron b. Malleable iron c. Ductile d. White iron
38. Steels may be carburized and nitrided simultaneously by the process known as a. Nitriding
b. Carburizing c. Carbonitriding d. Cyaniding
39. It is used in steels as an alloying element to combine hardness obtained by quenching with high strength and high elastic limit. a. Vanadium
b. Chromium c. Titanium d. Molybdenum
40. The art of making definite impressions in sand by means of a pattern for the purpose of producing a casting. a. Molding
b. Pattern c. Extrusions d. Die casting
41. Products that have cross-sections of less than 6 inches and that are not in the finished forms. a. Slabs
b. Gangue c. Blooms d. Billets
42. It is the process of forging by which the metal in the plastic state is made to flow within a die by the application of plunger pressure. a. Extrusion forging b. Smith forging c. Drop forging d. Press forging
43. It is a squeezing process use to finish sheet or bar stock for special purposes. a. Cold forging
b. Sizing c. Cold rolling d. Coining
44. A term used for most press operations. a. Sizing b. Stamping c. Coining d. Swaging
45. It is a process of shearing in which sheet or plate is cut out to a definite outline in a press.
a. Blanking b. Stamping c. Spinning d. Trimming
46. It is special case of drawing in which the work is rotated
and formed by means of a tool. a. Spinning b. Embossing c. Bulging d. Stretching-forming
47. It is a squeezing operation use for flattening or surfacing
various parts where a very small amount of flow of the material is involved. a. Hobbing b. Stamping c. Coining d. Sizing
48. It is a process by which a hot plastic metal is made to flow into dies by the application of the sudden blows to the material.
a. Drop Forging b. Press Forging c. Extrusion d. Machine Forging
49. It is a measure of stiffness.
a. Modulus of rigidity
b. Modulus of resilience c. Modulus of elasticity d. Modulus of toughness
50. It is a measure of the total energy absorbing capacity of the material and includes the energy of both the elastic and plastic deformation.
a. Modulus of toughness b. Modulus of resilience c. Modulus of elasticity d. Modulus of rigidity
1. THE MAXIMUM STRESS TO WHICH A STANDARDIZED TEST SPECIMEN MAY BE SUBJECTED WITHOUT A PERMANENT DEFORMATION. a.
Endurance limit
b.
Proportional limit
c.
Elastic limit
d.
Plastic limit
2. THE MODULUS OF ELASTICITY IS A MEASURE OF a.
Stiffness
b.
Toughness
c.
Resilience
d.
Harness
3.AGING AT MODERATELY ELEVATED TEMPERATURE EXPEDITES THE PROCESS AND IS CALLED a.
Natural aging
b.
Artificial aging
c.
Normal aging
d.
Supernatural aging
4.IT IS TENDENCY TO FRACTURE WITHOUT APPRECIABLE DEFORMATION. a.
Ductility
b.
Brittleness
c.
Malleability
d.
Plasticity
5.IT IS THE CHARACTERISTIC OF EXHIBITING DIFFERENT PROPERTIES WHAT TASTED IS DIFFERENT DIRECTIONS. a.
Allotropy
b.
Anisotropy
c.
Isentropy
d.
Isotropic
6.IT IS ONE IN WHICH SPECIMEN, SUPPORTED AT BOTH ENDS AS A SIMPLE BEAM IS BROKEN BY THE IMPACT STRENGTH OF THE METAL. a.
Charpy test
b.
Izod test
c.
Rockwell test
d.
Universal test
7. STEEL THAT HAS BEEN DEOXIDIZED WITH A STRONG DEOXIDIZING AGENT, SUCH AS SILICON OR ALUMINUM IN ORDER TO ELIMINATE A REACTION BETWEEN THE CARBON AND OXYGEN DURING SOLIDIFICATION. a.
Carbon steel
b.
Tool steel
c.
Killed steel
d.
Structural steel
8.INVOLVES THE LOSS OF DUCTILITY BECAUSE OF A PHYSICAL OR CHEMICAL CHANGE OF THE MATERIAL IS KNOWN AS a.
Embrittlement
b.
Pitting
c.
Cold shortness
d.
Decarburization
9.A MATERIAL COMMONLY USED FOR SHIELDING OR SCREENING MAGNETISM a.
Brass
b.
Copper
c.
Aluminum
d.
Soft iron
10.A MAGNET IS ABLE TO ATTRACT a.
Iron, aluminum and brass
b.
Iron, cobalt and zinc
c.
Iron, copper and nickel
d.
Nickel, cobalt and steel
11.WHICH OF THE FOLLOWING MATERIALS IS USED FOR MAKING PERMANENT MAGNETS? a.
Carbon steel
b.
Platinum cobalt
c.
Alnico
d.
All threes mentioned above
12.ONE OF THE FOLLOWING IS THE BEST CONDUCTOR OF ELECTRICITY. WHICH ONE? a.
Graphite
b.
China clay
c.
Porcelain
d.
Ceramics
13.DIELECTRIC STRENGTH OF A MATERIAL DEPENDS ON THE MATERIAL’S a.
Moisture contect
b.
Thickness
c.
Temperature
d.
All of the above
14.WHICH MEDIUM HAS HIGHEST VALUE OF DIELECTRIC STRENGTH? a.
Glass
b.
Mica
c.
Porcelain
d.
Quartz
15.WHICH OF THE FOLLOWING IS A PRIMARY CELL? a.
Mercury-oxide
b.
Lead-acid
c.
Nickel-iron-alkaline
d.
Nickel-cadmium-alkaline
16.WHICH OF THE FOLLOWING CONTACT POINT METALS HAS HIGHEST MELTING POINT? a.
Silver
b.
Tungsten
c.
Gold
d.
Copper
17.A MATERIAL BEST SUITED FOR MANUFACTURING OF FUSE WIRE. a.
Aluminum
b.
Silver
c.
Lead
d.
Copper
18.THE LAMINATIONS ARE MADE FROM a.
Low carbon steel
b.
Silicon sheet steel
c.
Nickel alloy steel stays
d.
Chrome steel sheets
19.WHICH OF THE FOLLOWING METALS GETS DEPOSITED TO PROVIDE AN UNDERCUT FOR CHROMIUM? a.
Copper
b.
Silver
c.
Bronze
d.
Lead
20.IN NICKEL-IRON CELL, THE ELECTROLYTE IS a.
Dilute sulpnuric acid
b.
Dilute potassium hydroxide
c.
Dilute sodium ammonium hydroxide
d.
Dilute sodium chloride solution
21. WHICH OF THE FOLLOWING IS NOT A PRIMARY CELL? a.
Carbon zinc
b.
Silver oxide
c.
Silver zinc
d.
Nickel- cadmium
22. SELECT FROM THE CONDUCTORS BELOW THAT HAS THE LEAST ELECTRICAL CONDUCTIVITY. a.
Lead
b.
Tin
c.
Zinc
d.
Aluminum
23.THE MATERIAL USED FOR COMMUTATOR BRUSHES IS MOSTLY a.
Copper
b.
Mica
c.
Carbon
d.
Cast iron
24. GENERALLY, THE MATERIAL FOR THERMOCOUPLE IS a.
Chromel copel
b.
Chromel alumel
c.
Platinum rhodium
d.
Any of the above
25.SELECT THE BEST CONDUCTOR OF ELECTRICITY a.
Carbon
b.
Silver
c.
Copper
d.
Iron
26.ANY HEATING AND COOLING OF STEEL THAT PRODUCES A ROUNDED OR GLOBULAR FORM OF CARBIDE a.
Spheroidizing
b.
Malleability
c.
Graphitizing
d.
Normalizing
27.STEEL THAT HAS BEEN HAMMERED ROLLED OR DRAWN IN THE PROCESS OF MANUFACTURE a.
Wrought steel
b.
Rimmed steel
c.
Killed steel
d.
Stainless steel
28. WHICH OF THE FOLLOWING IMPROVES RED HARDNESS? a.
Boron
b.
Cobalt
c.
Copper
d.
Colombium
29.AN ALLOY OF NICKEL AND COPPER a.
Monel
b.
Iconel
c.
Titanium
d.
Vanadium
30.COMMUTATOR SEGMENTS ARE MADE OF a.
Zinc
b.
Brass
c.
Copper
d.
Nickel
31.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
32. MANGANIN IS AN ALLOY OF a.
Copper, manganese and nickel
b.
Copper, zinc and lead
c.
Copper, aluminum and chromium
d.
Copper, chromium and cadnium
33.SELECT THE ONE THAT IS AN ACCEPTOR IMPURITY ELEMENT. a.
Antimony
b.
Gallium
c.
Arsenic
d.
Phosphorous
34.WHICH OF THE FOLLOWING IS NOT A METHOD OF NON DESFRUCTIVE TESTING OF STEEL CASTING AND FORGING? a.
Radiography
b.
Magnetic particle
c.
Ultrasonic
d.
Chemical analysis
35.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
36.IF 1080 STEEL IS ANNEALED BY VERY SLOW COOLING FROM 10C0°C TO AMBIENT TEMPERATURE, ITS MICROSTRUCTURE WILL CONSIST ALMOST SAFELY OF a.
Austenite
b.
Bainite
c.
Cementile
d.
Pearlite
37.STEEL CAN BE STRENGTHENED BY ALL OF THE FOLLOWING PRACTICES EXPERT a.
Annealing
b.
Quenching and tempering
c.
Work hardening
d.
Grain refinement
38. INTRINSIC SILICON BECOMES EXTRINSICALLY CONDUCTIVE, WITH ELECTRONS AS MAJORITY CANLERS WHEN DOPED WITH WHICH OF THE FOLLOWING? a.
Antimony
b.
Boron
c.
Germanium
d.
Aluminum
39.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
40.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 atom to interstitial sites
d.
Linear defects, or slippage dislocations caused by shear
41. WHEN A METAL IS COLD WORKED ALL OF THE FOLLOWING GENERALLY OCCUR EXCEPT: a.
Ductility decreases
b.
Grains becom equi-axed
c.
Tensile strength increases
d.
Slip or twinning occurs
42. HARD WATER IS WATER, WHICH CONTAINS SOLUBLE WATER SALTS OF WHICH OF THE FOLLOWING ELEMENTS. a.
Sodium
b.
Sulfur
c.
Calcium
d.
Chlorine
43.WHICH OF THE FOLLOWING METALS HAS THE HIGHEST SPECIFIC HEAT CAPACITY AT 100°C? a.
Aluminum
b.
Bismush
c.
Copper
d.
Iron
44.ALUMINUM PISTONS ARE EITHER CAST OR a.
Ground
b.
Forged
c.
Pressed
d.
Welded
45.VALVES AND PIPING IN AN AMMONIA SYSTEM ARE MADE OF a.
Iron
b.
Brass
c.
Copper
d.
Bronze
46. WHICH OF THE FOLLOWING GASKET MATERIALS SHOULD BE USED OF A FREON SYSTEN? a.
Metallic
b.
Asbestos
c.
Rubber
d.
A&B
47. THE NON-FERROUS ALLOY CORRODES IN AMMONIA IS a.
Copper
b.
Bronze
c.
Brass
d.
All of the above
48.WHAT IS USED IN THE MAIN CONDENSER TO CONTROL ELECTROLYSIS? a.
Brass plate
b.
Aluminum plates
c.
Zinc plates
d.
Bronze plates
49.WHICH OF THE FOLLOWING TYPES OF PACKING WOULD BE USED ON STEAM JOINTS? a.
Asbestos
b.
Neoprene
c.
Metallic
d.
A or C
50. THE PROCESS APPLIED TO IRON PIPE, WHICH RETARDS CORROSION, IS CALLED a.
Galvanizing
b.
Annealing
c.
Soldering
d.
Tinning
51. A SCRIBER IS MADE FROM WHAT STEEL? a.
Carbon steel
b.
Cold- rolled steel
c.
Tool steel
d.
Hot-rolled steel
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