E.M.C Sample Question

8/11/2019 E.M.C Sample Question

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64. Which one of the following are the basic types of static stresses to

which a material can be subjected?

(a) Compression

(b) Hardness, reduction in area,

(c) Shear, tensile

(d) Both a and c are correct

65. Which one of the following are mechanical properties of materials?

(a) Strength, hardness, toughness

(b) Ductility, elasticity, fatigue

(c) Boiling point, conductivity, density

(d) Both a and b are correct

66. In machine tools where different components are made of different

components, the assembly may jam, or become too loose and vibrate,

when the temperature changes. Their design must account and

compensate for the materials used their?

(a) Ductility

(b) Density

(c) Fatigue

(d) Thermal expansion

67. The plastic region of the stress-strain curve for a metal is characterized

by a proportional relationship between stress and strain?

(a) True (b) false

68. Which one of the following materials has the highest hardness?

(a) Aluminum,(b) Diamond,

(c) Steel,

(d) Titanium


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69. Most hardness tests involve pressing a hard object into the surface of a

test specimen and measuring the indentation (or its effect) that results?

(a) True (b) false

70. Steel is a good material for the wrecking ball used to demolish old

buildings because of Its?

(a) High density

(b) Low elasticity

(c) High coefficient of linear thermal expansion

(d) Low fatigue

71. Which one of the following metals has the lowest density?

(a) Aluminum

(b) Copper

(c) Magnesium

(d) Tin

72. Due to its poor thermal conductivity, titanium can be easily machined

on a milling machine?

(a) True (b) false

73. Which of the following pure metals is the best conductor of electricity?

(a) Aluminum,

(b) Copper,

(c) Gold

(d) Silver

74. Cast iron is a ferrous alloy with up to 2% carbon?

(a) True (b) false


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75. Bronze is a metal alloy consisting primarily of copper and tin?

(a) True (b) false

76. Brass is an alloy of copper and zinc?

(a) True (b) false

77. Which one of the following casting processes is the most widely used?

(a) Centrifugal casting

(b) Die casting

(c) Investment casting

(d) Sand casting

78. Compared to others casting processes, investment casting process is

the best solution for manufacturing of?

(a) Engine blocks

(b) Gears

(c) Jewellery

(d) Car wheels

79. in sand casting, the volumetric size of the pattern is?

(a) Bigger than

(b) The same size

(c) Smaller than the cast part

(d) All the above

80. Which of the following casting processes are expendable mold

operations?

(a) Investment casting

(b) Sand casting

(c) Shell molding

(d)All the above


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81. Shell molding is best described by which one of the following?

(a) Casting operation in which the molten metal has been poured out after a thin

shell has been solidified in the mold

(b) Casting process in which the mold is a thin shell of sand binded by a

thermosetting resin

(c) Sand casting operation in which the pattern is a shell rather than a solid form

(d) Casting operation used to make artificial sea shells

82. Investment casting is also known by which one of the following

names?

(a) fast-payback molding

(b) full-mold process

(c) Lost pattern process

(d) lost-wax process

83. Which of the following casting processes are permanent mold

operations?


(b) Die casting

(c) Vacuum casting.

(d) All the above

84. Which of the following are advantages of die casting over sand

casting?

(a) Better surface finish

(b) Closer tolerances(c) Mold can be reused

(d) All the above


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85. Identify the material with the lowest ductility?

(a) Copper

(b) Graphite

(c) Aluminum

(d) Platinum

86. In a hot chamber die casting machine the melting pot?

(a) Melting pot is separate from the machine

(b) Melting pot is an integral part of the machine

(c) Melting pot may have any location

(d) There is no need for melting pot

87. % C in medium carbon steels ranges from?

(a) 0.30.4

(b) 0.3 0.5

(c) 0.3 0.6

(d) None

88. Stainless steel is also known for its?

(a) High strength

(b) High corrosion resistance

(c) High ductility

(d) Brittleness

89. In white cast irons, carbon is present as?

(a) Graphite flakes

(b) Graphite nodules

(c) Cementite

(d) Carbon does not exist

90. Not an important heat treatment process parameter is?

(a) Heating rate

(b) Temperature

(c) Cooling rate

(d) Atmosphere


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91. Final structure of austempered steel is?

(a) Pearlite

(b) Ferrite + graphite

(c) Bainite

(d) Martensite

92. Sand casting is which of the following types?

(a) Expendable mold (b) Permanent mold

93. The upper half of a sand casting mold is called which of the following?

(a) Cope (b) drag

94. In casting, a flask is which one of the following?

(a) Beverage bottle for foundry men

(b) Box which holds the cope and drag(c) Container for holding liquid metal

(d) Metal which extrudes between the mold halves

95. in foundry work, a runner is which one of the following?

(a) Channel in the mold leading from the downsprue to the main mold cavity

(b) Foundry man who moves the molten metal to the mold

(c) Vertical channel into which molten metal is poured into the mold

(d) All the above


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96. Turbulence during pouring of the molten metal is undesirable for which

of the following reasons?

(a) It causes discoloration of the mold surfaces

(b) It increases erosion of the mold surfaces

(c) It increases the formation of metallic oxides that can become entrapped during

solidification

(d) B and c are correct

97. Total solidification time is defined as which one of the following?

(a) Time between pouring and complete solidification

(b) Time between pouring and cooling to room temperature

(c) Time between solidification and cooling to room temperature

(d) Time to give up the heat of fusion

98. A riser in a casting is described by which of the following?

(a) Metal that is not part of the casting

(b) Source of molten metal to feed the casting and compensate for shrinkage

during solidification

(c) Waste metal that is usually recycled

(d) All the above

99. Which best describes what is sought by nondestructive testing?

(a)Surface irregularities

(b)Subsurface holes and cracks

(c)Any breaks in the continuity of metal structure

(d)A direct test method

100. Nondestructive testing is a method of locating which of the following?

(a)Discontinuations

(b)Dislocations

(c)Discontinuities

(d)Disturbances


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101. For which one of the following reasons is a green mold named?

(a) Green is the color of the mold

(b) Moisture is contained in the mold

(c) Mold is cured

(d) Mold is recycled

102. Which of the following provides the NDT inspector with a brief outline

of the steps to perform a test on a specific item?

(a)Code

(b)Standard

(c)Procedure(Instruction)

(d)Specification

103. Metal has a property of:

(a)Failing to unite if too hot

(b)Retaining large grain structure when forged

(c)Occupying more space when molten than when a solid

(d)Occupying more space when a solid than when a molten

104. A typical temperature range to stress relieve ferrite steel is?

(a) 100-150 degrees Celsius

(b) 250-300 degrees Celsius(c) 600-650 degrees Celsius(d) 900-950 degrees Celsius

105. Which of the following qualifies as a precision casting process?

(a) Ingot casting

(b) Investment casting,

(c) Plaster mold casting

(d) B and c are correct


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106. Which of the following casting processes are permanent mold

operations?


(b) Die casting

(c) Sand casting(d) A and b are correct

107. Which of the following metals would typically be used in die casting?

(a) Aluminum

(b) Tin

(c) Zinc

(d) All the above

108. The ease with which a solid union may be made between two parts bywelding is known as?

(a)Weld ability(b)Joining(c)Buttering(d)Soldering

109. Cupolas are furnaces used to melt which of the following metals?

(a) Aluminum

(b) Cast iron(c) Steel

(d) Zinc

110. A misrun is which one of the following defects in casting?

(a) globules of metal becoming entrapped in the casting

(b) Metal is not properly poured into the downsprue

(c) Metal solidifies before filling the cavity

(d) Micro porosity


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111. Products used in load carrying applications require more carefultesting because?

(a) Failure can cause loss of life(b) Failure can cause loss of use of the product(c) Failure can be expensive(d) All the above

112. Loads which are most likely to cause failure are?

(a) Single direction(b) Multi directional(c) Duo directional(d) Phase orientated

113. The general term for a local variation in material continuity is called?

(a) A discontinuity(b) A defect(c) An indication(d) A crack

114. Where an unacceptable condition occurs in a material, due to localvariations in material continuity the term given specifically to this is?

(a)A discontinuity(b)A flaw

(c)A defect(d)Any of the above

115. Which of the following could be considered a discontinuity?

(a)Crack(b)Change of section(c)Drilled holed(d)All the above

116. The study and description of a material property related to analyticalstudies and testing attempts to quantify the toughness of a material is

known as?

(a)Fracture mechanics(b)Acceptance standards(c)Defect reliability(d)Defect analysis


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123. Changing a material's shape can be accomplished in which of thefollowing states?

(a)Solid(b)Liquid(c)Plastic(d)All of the above

124. Which of the following is an example of reshaping?

(a)Casting(b)Forging(c)Grinding(d)All of the above

125. The process of solidification during casting can be likened to that ofthe?

(a)Forging process(b)Rolling process(c)Welding process(d)Extrusion process

126. Reshaping of a material while still in a plastic or semi-solid form iscalled?

(a)Casting(b)Rolling

(c)Extrusion(d)Both b and c are correct

127. Which of the following could be referred to as an engineeringmaterial?

(a)Plastic(b)Concrete(c)Glass(d)All of the above

128. Which of the following properties of a material can be used to predictthe deflection of a certain size beam under known loads?

(a)Tensile strength(b)Elastic limit(c)Younges modules(d)Ductility


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129. Which of the following must be considered when choosing anengineering material for a particular application?

(a)Cost(b)Loading(c)Mechanical properties(d)Any of the above

130. Which of the following could effect the properties of an engineeringmaterial?

(a)Composition(b)Heat treated condition(c)Composition and heat treated condition(d)Composition, heat treated condition and crystal structure

131. Which of the following is classed as a chemical property?

(a)Electrical conductivity(b)Thermal conductivity(c)Corrosion resistance(d)Machine resistance

132. Which of the following is classed as a Physical property?

(a)Density(b)Conductivity(c)Melting point

(d)All of the above

133. A test designed to determine a materials cast ability would beclassified as looking for a?

(a)Mechanical property(b)Physical property(c)Processing property(d)Chemical property

134. Internal forces acting upon imaginary planes cutting the body beingloaded are?

(a)Stresses(b)Pressures(c)Strain(d)Fatigues


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135. A stress caused by forces at an angle to the plane is known as a?

(a)Comprehensive stress(b)Tensile stress(c)Normal stress(d)Shear stress

136. A non-destructive test is usually classified as a?

(a)Indirect test(b)Direct test(c)Destructive test(d)Indirect and direct test

137. If a material is loaded until its elastic limit is exceeded, whatcondition will occur?

(a)The material may fracture(b)The material may be work hardened(c)The material will show no harmful effects(d)The material may fracture and the material may be work hardened

138. The ultimate strength of material is?

(a)Lower than the breaking strength for ductile materials(b)Lower than the rupture strength for ductile materials(c)The same as the breaking strength for brittle materials

(d)None of the above

139. The modulus of elasticity is also known as?

(a)Stress's modulus(b)Young's modulus(c)Strain's modulus(d)Resilience

140. Which of the following materials exhibits better compressive strengththan tensile strength?

(a)Cast iron(b)Concrete(c)Wood(d)All the above


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141. When a metal is very brittle which test is used to replace the tensiletest?

(a)The shear test(b)The transverse rupture test(c)The compression test(d)The endurance test

142. Fatigue failure may initiate from?

(a)An area of corrosion(b)An internal flaw(c)A surface notch(d)All the above

143. Metal forming such as rolling results in?

(a)Plastic flow of metal.(b)Elongation of existing defects perpendicular to the rolling direction.(c)Directional properties which are always beneficial for secondary forming

operations.(d)The flatting out of defects which makes them more easily detectable by most

NDT methods.

144. Hardness tests can be used to determine material?

(a)Hardness

(b)Composition(c)Heat treated condition(d)All the above

145. The superficial Rockwell test is carried out on materials that?

(a)Only allow very small surface blemishes(b)Are very ductile(c)Have very large surface areas(d)None of the above

146. Which of the following is a notched bar test?

(a)Charpy(b)Creep(c)Izod(d)Both a and c are correct


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147. To what angle should a bend test be normally bent?

(a)180 degrees(b)150 degrees(c)90 degrees(d)None of the above

148. Which of the following is a hardness test?

(a)Rockwell(b)Creep(c)Charpy(d)Izod

149.Grain direction in steel bar stock is always?

(a)Though the length of the bar(b)Though the width of the bar(c)Spread out in all directions(d)A bar of steel has no grain

111. All the above112. Multi directional113. A discontinuity114. A defect

115. All the above116. Fracture mechanics117. A defect118. Elastic deformation119. At low temperatures120. It is generally used in applications where the loads are principallycomprehensive121. Manufacturing process122. Shape and Properties123. All of the above124. Forging125. Welding process

126. Rolling and Extrusion127. Plastic128. Younges modules129. Any of the above130. Composition, heat treated condition and crystal strucure131. Corrosion resistance132. All of the above133. Processing property


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134. Stresses135. Shear stress136. Indirect test137. The material may fracture and the material may be work hardened138. The same as the breaking strength for brittle materials139. Young's modulus140. All the above141. The transverse rupture test142. All the above143. answer is:A144. All the above145. Only allow very small surface blemishes146. Charpy and Izod147. 180 degrees148. Rockwell149. Shear stresses

150. Electrons in an atom can exist?

(a)Only in exact energy levels(b)Only in exact energy shells

(c)At random throughout the atom(d)In Exact energy levels and in exact energy shells

151. A material that has high hardness and good electrical and thermalconnectivity is known as?

(a)A plastic material(b)A ceramic material(c)A metallic material(d)A liquid material

152. What term is used to define the change of state directly from solid togas?

(a)Crystallization(b)Vaporization(c)Sublimation(d)None of the above


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153. Which of the following is a crystal lattice that has nine atoms, eight ateach corner and one centrally between them?

(a)Hexagonal close packing(b)Body centered cubic(c)Face centered cubic(d)Body centered tetragonal

154. Which of the following materials is Body centered cubic at roomtemperature?

(a)Copper(b)Gold(c)Iron(d)Nickel

155. A property of a fine grain material is that it will?

(a)Machine more easily than Corse grain(b)Case harden more easily than coarse grain(c)Have higher strength than coarse grain(d)All the above

156. Permanent deformation can occur in which of the following ways?

(a)Static deformation(b)Twinning deformation(c)Elastic deformation(d)All of the above

157. Work done to produce plastic deformation below a materials re-crystallization temperature is known as?

(a)Recovery work(b)Cold work(c)Twinning(d)Plasticity work

158. Solution heat treatment requires which of the following?

(a)To dissolve maximum amount of equilibrium precipitant in the solid solution(b)Very high temperatures(c)Diffusion times in excess of 24 hours(d)All of the above


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159. Precipitation hardening is most commonly carried out on which of thefollowing materials?

(a) Carbon steel(b) Lead(c) Copper(d) Aluminum

160. Allotropic changes occur in the?

(a) Liquid state(b) Solid state(c) Gaseous state(d) Liquid or solid state

161. Which of the following is an allotropic material?

(a) Iron(b) Copper(c) Lead(d) Aluminum

162. A heat treatment process that requires a material to be heated aboveits critical temperature for some period of time for carbon to unite in solidsolution with iron in the gamma or F.C.C. lattice is known as?

(a)Spherodizing(b)Annealing(c)Austentitization(d)Normalizing

163. A process used to decrease hardness, increase ductility andoccasionally improve machinability of high carbon steels is called?

(a)Annealing(b)Austenitization(c)Spheroidizing

(d)Stress relieving

164. A treatment that is used to give minimum hardness and maximumductility of steel is?

(a)Annealing(b)Austenitization(c)Spheroidizing


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(d)Normalizing

165. Localized corrosion causing deep extend holes is known as?

(a)Fisives(b)Pitting(c)Worm holes(d)None of the above

166. Which of the following is classed as permanent deformation?

(a)Twinning(b)Rotational deformation(c)Twinning and Slip(d)All of the above

167. Annealing will achieve which of the following properties?

(a)Increase ductility and decrease hardness(b)Increase ductility and increase hardness(c)Decrease ductility and increase hardness(d)Decrease ductility and decrease hardness

168. Of the following metals which is most susceptible to corrosion by seawater?

(a)Gold(b)Copper(c)Zinc(d)Lead

169. During the hardening of steel which of the following quenching mediawill produce the severest quench?

(a)Water(b)Brine(c)Oil

(d)Air

170. Which is the most common metallic element found on earth?

(a)Iron(b)Titanium(c)Aluminum(d)Magnesium


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171. The product of a blast furnace is known as?

(a)Iron(b)Steel(c)Pig iron(d)A pig

172. What is the approximate carbon content of Pig iron?

(a)1-2%(b)2-3%(c)3-4%(d)4-5%

173. When the carbon content of iron is reduced below 2% it is called?

(a)Steel(b)Gray iron(c)White iron(d)Ductile iron

174. A Bessemer converter is?

(a)A method of producing cast iron(b)A method of producing pig iron(c)A method of producing wrought iron

(d)A method of producing steel

175. Practically all steel is made with the use of?

(a)Hydrogen(b)Oxygen(c)Nitrogen(d)Helium

176. The carbon content of low carbon steel is?

(a) 6-25 points of carbon

(b) 25-50 points of carbon(c) 0.06% -0.25% of carbon(d) 6-25 points and 0.06% -0.25% of carbon


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177. The carbon content of high carbon steel is?

(a)6-25 points of carbon(b)25-50 points of carbon(c)50-160 points of carbon(d)Over 160 points of carbon

178. An alloy steel is a steel containing one or more?

(a)Elements(b)Atoms(c)Mixtures(d)Components

179. What do the letters AISI stand for?

(a)American Institute of Steel Industries(b)American Iron and Steel Industries(c)American Industries of Steel Institutes(d)American Iron and Steel Institute

180. Which of the following is a classification of Stainless Steel?

(a)Ferrite(b)Martensitic

(c)Austenitic(d)All of the above

181. Austenitic stainless steel most typically contain?

(a)18% Chromium 8% Nickel(b)15% Chromium 10% Nickel(c)10% Chromium 15% Nickel(d)8% Chromium 18% Nickel

182. Which of the following metals can be magnetized?

(a)Martensitic stainless(b)Ferrite stainless(c)Austenitic stainless(d)Martensitic stainless and Ferrite stainless


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183. Which of the following may be used as an alloying element of steel?

(a)Copper(b)Nickel(c)Aluminum(d)All the above

184. Steel has a carbon content of less than?

(a)4%(b)3%(c)2%(d)1%

185. Which is the main alloying element of austenitic stainless steels?

(a)Nickel(b)Manganese(c)Molybdenum(d)Chromium

186. Grain boundaries are areas of a metal micro structure:

(a)Where high melting point constituents are concentrated(b)Made up of rows of atoms arrayed in straight lines(c)That are not attacked by etchants and generally stand in relief during

metallografic examination.(d)Where low melting impurities tend to concentrate

187. Tool and die steels are classed as?

(a)Low carbon steels(b)Medium carbon steels(c)High carbon steels(d)Alloy steels

188. Which of the following alloying additions are used to produce tool anddie steels?

(a)Nickel(b)Chromium(c) Manganese(d) Both Chromium and Manganese


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150. In Exact energy levels and in exact energy shells151. A metallic material152. Sublimation153. Body centered cubic154. Iron155. Have higher strength than coarse grain156. Twinning deformation

157. Cold work158. To dissolve maximum amount of equilibrium precipitant in the solid solution159. Aluminum160. Solid state161. Iron162. Austentitization163. Annealing164. Spheroidizing165. Pitting166. All of the above167. Increase ductility and decrease hardness

168. Zinc169. Brine170. Aluminum171. Pig iron172. 3-4%173. Steel174. A method of producing steel175. Oxygen176. 6-25 points and 0.06%-0.25% of carbon177. 50-160 points of carbon178. Elements179. American Iron and Steel Institute

180. All of the above181. 18% Chromium 8% Nickel182. Martensitic stainless and Ferrite stainless183. All the above184. 1%185. Chromium186. answer is: D187. High carbon steels


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188. Both Chromium and Manganese

189. Which of the following is classified as a non-ferrous light alloy?

(a)Beryllium base(b)Zinc base(c)Tin base(d)Copper base

190. Of the following, which is considered the most important structuralnon-ferrous metal?

(a)Copper(b)Zinc(c)Tin(d)Aluminum

191. Aluminum cannot be used in most areas where vibrations combinewith high stress. There are special care has to be taken to remove allstress raisers. Which below is considered a stress raiser?

(a)A notch(b)A scratch(c)A sudden change of section(d)All of the above

192. When applying the term annealed to pure aluminum it is interpreted

to mean?

(a)Work hardening(b)Re-crystallization(c)Stress releasing(d)Normalizing

193. Which NDT method can be used to give general sorting of aluminumalloys?

(a)UT(b)MT

(c)RT(d)ET

194. Which metal is most used in electrical work, wiring, etc?

(a)Copper(b)Brass(c)Aluminum


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(d)Steel

195. It is generally understood that the principal alloying elements ofbrass are?

(a)Copper and tin(b)Copper and zinc(c)Bronze and tin(d)Tin and zinc

196. Which two NDT methods are usually used to inspect Magnesiumcomponents?

(a)Radiography and penetrant(b)Radiography and magnetic particle(c)Ultrasonic and magnetic particle(d)Ultrasonic and penetrant

197. Wrought zinc and its alloys have very little NDT inspection on them,when a material is plated with zinc it is known as?

(a)Anodizing(b)Wrapping(c)Galvanizing(d)Flashing

198. Thermoplasting can be?

(a)Melted down and re-used without loss of properties(b)Softened by heat(c)Will char when heated(d)Melted down and re-used without loss of properties and softened by heat

199. Thermosetting plastics are?

(a)Rigid(b)Deteriorated by heat(c)Charred by heat(d)All of the above

200. Which of the following non-ferrous metals is classed as a light alloy?

(a)Beryllium base(b)Zinc base(c)Tin base(d)All of the above


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201. Which of the metals listed below has the highest strength to weightratio?

(a)Beryllium(b)Titanium(c)Aluminum(d)Zinc

202. One of the major drawbacks of magnesium alloys is?

(a)Poor corrosion resistance(b)Notch sensitivity(c)High density(d)More expensive than using beryllium which exhibits similar properties

203. Which of the following non-ferrous metals is almost exclusively die-

cast?

(a)Aluminum(b)Copper(c)Magnesium(d)Zinc

204. Cobalt is used as an alloying constituent in?

(a)Bearing alloys(b)Solders

(c)Permanent magnets(d)Dental alloys

205. Manufacturing is a term used generally to describe the ??? of a bulkmaterial?

(a)Designing(b)Production(c)Shape changing(d)Casting

206. Which of the following is classed as a manufacturing process?

(a)Casting(b)Welding & Machining(c)Rolling(d)All of the above


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207. Which of the following manufacturing processes is the mosteconomical method of producing complex shapes?

(a)Casting(b)Forging(c)Rolling(d)Welding

208. In modern manufacturing industries which of the following factorsare considered?

(a)Markets(b)Product life(c)Manufacturing process(d)All of the above

209. Which of the following is required when making a sand casting?

(a)A mold(b)A pattern(c)A flask(d)All of the above

210. Shrinkage within a casting can occur in which of the following states?

(a)Liquid state(b)Solidification(c)Solid state

(d)All of the above

211. Pattern makers shrinkage occurs in?

(a)Liquid state of casting(b)Solidification state of casting(c)Solid state of casting(d)All of the above

212. When a change of wall thickness is required in a casting what wouldgive the best design results?

(a)Sudden section change(b)Small radii(c)Large radii(d)All of the above


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213. Metal is fed into the casting cavity through a ??? system?

(a)Flow system(b)Gating system(c)Pouring system(d)Riser system

214. Wells outside the normal finished casting are there to allow for?

(a)Gas evolution(b)Sand erosion(c)Shrinkage(d)Airlocks

215. Directional solidification in Castings is helped by the use of?

(a)Cores

(b)Feeder headers(c)Chills(d)Chaplets

216. Where holes or cavities are required in the finished casting a ??? isused in the moulding stage?

(a)Chill(b)Ingate(c)Riser(d)Core

217. Green sand is a mixture of sand and?

(a)Clay(b)Silicon(c)Water(d)Both a and c are correct

218. The upper half of a flask is called?

(a)A drag(b)A cope

(c)A draft(d)A mould


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219. Small metal supports which become part of the casting during pouringare called?

(a)Chills(b)Chaplets(c)Cores(d)Risers

220. Which of the following casting processes is best used for smallintricate casting up to 2kg - requiring close tolerances?

(a)Centrifugal casting(b)Investment casting(c)Continuous casting(d)Permanent mold casting

221. The casting process which gives improved material density towardsthe outside of the mold is?

(a)Centrifugal casting(b)Investment casting(c)Continuous casting(d)Permanent mold casting

222. Splashed metal entrapped by molten metal that does not re-fuse is

called?

(a)Hot tear(b)Chill(c)Inclusion(d)Cold shut

223. The bottom part of the flask is known as the?

(a)Cope(b)Bottom board(c)Drag

(d)Runner


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224. Which of the following is used to give preferential solidification ofcastings?

(a)Chills(b)Chaplets(c)Cores(d)None of the above

225. In the casting process what name is given to the part which is used torepresent the finished item?

(a)The mould(b)The spruce(c)The pattern(d)The shell

226. The crystal structure of a casting adjacent to the mould wall will be?

(a)Fine equiaxed grains(b)Core equiaxed grains(c)Columnar grains(d)Dendritic

189. Beryllium base

190. Aluminum191. All of the above192. Re-crystallization193. ET194. Copper195. Copper and zinc196. Radiography and penetrant197. Galvanizing198. Will char when heated199. Charred by heat200. Beryllium base201. Beryllium

202. Notch sensitivity203. Zinc204. Permanent magnets205. Shape changing206. All of the above207. Casting208. All of the above209. All of the above


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210. All of the above211. Solid state of casting212. Large radii213. Gating system214. Shrinkage215. Chills216. Core217. Clay and water218. A cope219. Chaplets220. Investment casting221. Centrifugal casting222. Cold shut223. Drag224. Chills225. The pattern226. Fine equiaxed grains

227. Which of the following is required - in theory - for two perfectlymatched faces?

(a)Atomic cleanliness(b)Atomic closeness(c)Pressure

(d)Both a and c are correct

228. Fusion bonding creates a metallurgical effect similar to?

(a)Rolling(b)Forging(c)Casting(d)Sintering

229. The bonding process giving very high efficiency is?

(a)Fusion bonding(b)Pressure bonding(c)Flow bonding(d)Atomic bonding


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230. A bonding process where only very small amounts of the base metal isused is called?

(a)Fusion bonding(b)Pressure bonding(c)Flow bonding(d)Cold bonding

231. Flow bonding is a particular type of bond, which listed below would beclassed as a flow bond?

(a)Fusion welding(b)Braze welding(c)Metal arc welding(d)None of the above

232. Which of these defects can be found in fusion welds?

(a)Porosity(b)Slag(c)Cracks(d)All of the above

233. The portion of the base metal affected by the welding process isknown as?

(a)The weld zone

(b)The heat input zone(c)The weld affect zone(d)The heat affected zone

234. Multiple cooling rates can have adverse affects on weld areas. Whatcan be done to offset this problem?

(a)Use different alloy rods to control temperature(b)Using a pre-heat(c)Use different alloy rods to control temperature and using a pre-heat(d)Nothing can be done to offset the problem

235. Angular distortion may occur in a weld when?

(a)Restraints are used(b)Multipass welds are used(c)Single pass welds are used(d)Multiple welds and single pass welds are used


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236. Longitudinal stresses in a weld are at a maximum?

(a)Along the weld centre line(b)On the weld fusion face(c)At the heat affected zone(d)Longitudinal stresses are uniform across the weld

237. What is required to form a fusion bond?

(a)Melting of parent metals(b)A filler rod(c)Pressure(d)All of the above

238. Flow bonding is a term used in the welding process which of thefollowing would be classed as flow bonding?

(a)Brazing(b)Braze welding(c)Soldering(d)All of the above

239. In forgings the grain?

(a)Follows the shape of the dies(b)Becomes coarser(c)Retains its original shape(d)Both a and b are correct

240. In order to produce a fully homogenous material after welding whichof the following is required?

(a)Preheat(b)Post heat treatment(c)Low heat input welding(d)Fillers of different composition

241. In electric arc welding, a metal rod is one electrode, the other is?

(a)The work material

(b)The rod flux(c)The earth(d)The work material and the rod flux


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242. Stud welding is used primarily to?

(a)Bond two dissimilar metals(b)Attach threaded fasteners to plates(c)Rivet plates together(d)Fuse bar ends together

243. A welding electrode coatings provides?

(a)A shield for the arc against the atmosphere(b)Added heat input(c)Additional stresses to the weld(d)None of the above

244. Where gas is used as a shield for the welding process the gas iscommonly?

(a)Argon(b)Helium(c)Hydrogen(d)Argon and Helium

245. When using gas metal arc welding what range of filler wire diameteris available?

(a) 0.1-0.5mm(b) 0.5-30mm(c) 0.1-30mm

(d) 0.5-10mm

246. Automatic welding under a flux is more commonly known as?

(a)TIG welding(b)Manual metal arc welding(c)Submerged arc welding(d)Stick welding

247. Spot welding is commonly used in which of the followingapplications?

(a)Car manufacturing(b)Seam welding(c)Shipbuilding(d)Fabrication yards


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248. Which welding process takes place in a vacuum?

(a)Plasma arc welding(b)Electron beam welding(c)Friction welding(d)Explosion welding

249. Which welding process is generally used to weld the ends of heavyround bars or tubes?

(a)Ultrasonic welding(b)Electro slag welding(c)Plasma arc welding

(d)Friction welding

250. Explosion welding is generally used to join?

(a)Two or more metals of different composition(b)Butt welds(c)Very think titanium sheeting(d)Plastics

251. AWS categorize weld defects into three classes which below is adimensional defect?

(a)Slag(b)Warping(c)Lack of fusion

(d)Porosity

252. Which of the following is classed as a structural defect?

(a)Undercut(b)Slag(c)Incomplete fusion(d)All of the above

253. Welds without preheat are said to have?

(a)Very low thermal gradients(b)Low thermal gradients(c)Medium thermal gradients(d) High thermal gradients


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254. Why is it advisable to leave the final inspection of a weld until well

after the welding has finished?

(a)Because the welds will be too hot to test(b)Due to the possibility of distortion(c)Due to the possibility of post weld cracking(d)All of the above

255. What is the approximate arc column temperature in an electric arcweld?

(a)6000 degrees Celsius(b)5000 degrees Celsius(c)4000 degrees Celsius(d)3000 degrees Celsius

256. Which of the following is classified as an inert gas?

(a)Hydrogen(b)Helium(c)Oxygen(d)All of the above

257. Which weld process has a non-consumable electrode?

(a)Manual metal arc(b)Metal inert gas

(c)Tungsten inert gas(d)Manual metal arc and metal inert gas

258. Which of the following processes could be performed usingoxyacetylene equipment?

(a)Flame cutting(b)Brazing(c)Soldering(d)All of the above

259. How might a weld arc be shielded from oxidation?

(a)Flux powders(b)Welding rod coatings(c)Inert gases(d)All of the above


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227. Atomic cleanliness and atomic pressure228. Casting229. Pressure bonding230. Flow bonding231. Braze welding232. All of the above233. The heat affected zone234. Using a pre-heat235. Multiple welds and single pass welds are used236. Along the weld centre line237. Melting of parent metals238. All of the above239. The answer is : A240. Post heat treatment

241. The work material242. Attach threaded fasteners to plates243. A shield for the arc against the atmosphere244. Argon and Helium245. 0.5-3mm246. Submerged arc welding247. Car manufacturing248. Electron beam welding249. Friction welding250. Two or more metals of different composition251. Warping

252. All of the above253. High thermal gradients254. All of the above255. 6000 degrees Celsius256. Helium257. Tungsten inert gas258. All of the above259. All of the above

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E.M.C Sample Question