161) by what team the strength of a grinding wheel expressed
A)GREED
162) name the process of reducing the iron ore to pig iron
A)SMELTING
163) by what name the impurities floating on the top of molten metal called
A)SLAG
164) which kind plain carbon steel is used for making axles, drop forgings etc?
A)MEDIUM CARBON STEEL
165) what is the disadvantage of Bessemer process?
A)INCREASED OXYGEN CONTENT WILL IMPAIR IT IS A MECHANICAL PROPERTIES
166) Which is burnt from the molten bath at the second stage of Bessemer process?
A)CARBON
167) name two metals charged in open hearth process?
A)PIG IRON AND STEEL SCRAP
168) name any two solid carburising media
A)WOOD BONE, LEATHER, CHARCOAL
169)name two types of solid fuels used in a blacksmith's hearth for hand- forging.
A)COAL AND CHARCOAL
170) the best placement of stock for heating in the forge is
A)AWAY FROM THE TUYERE WITH A THICK LAYER OF COAL ON THE TOP
171) mild steel rack angel :
A)25 DEGREES
172) name the gas used in nitriding process..
A)AMMONIA
173) what is the hardening temperature for HSS?
A)1250°C
174) state any two advantages of flame hardening...
A)SHORT HARDENING TIME, GREAT DEPTH OF HARDENING, LOW FUEL CONSUMPTION
175) the body is pulled along so that it slips at a steady speed over the surface is....
A)SLIDING FRICTION
176) the purpose of tempering a hardened steel component is for
A)REDUCING IT'S BRITTLENESS
177) name any two carbonaceous materials used for carburising..
A)CHARCOAL, CHARRED LEATHER, BONE
178) how snips are specified?
A)OVERALL LENGTH AND SHAPE OF BLADE
179) what are the functions of flux?
A)REMOVE OXIDES FROM SOLDERING SURFACE, PREVENTS CORROSION, HELPS MOLTED SOLDER FLOW EASILY
180) name the process of joint two edges of to metal sheets together
A)SEAM
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