EMAE 160 RVW 4 EXAM QUESTIONS
AND ANSWERS
What is metal injection molding? - ANSWER-finely-powdered metal is mixed with
binder material making 'feedstock', which is then handled by plastic processing
equipment in injection mold forming (powdered metallurgy)
What fluid is used in ECM metal removal? - ANSWER-conductive fluid/electrolyte
What fluid is used for EDM metal removal? - ANSWER-dielectric fluid (deionized
water, oil- often kerosene based)
What is impregnation in terms of the powdered metallurgy process? - ANSWER-
filling a porous substrate to make it airtight. In powder metallurgy, impregnate inner
void prior to plating to reduce corrosion. Fill sintered component with lubricants
Machining process used to produce square blind hole in steel is? - ANSWER-RAM
EDM
Machining process used to produce narrow slot in hardened tool steel is? -
ANSWER-Laser beam cutting and water jet cutting
Three steps in powder metallurgy include: - ANSWER-blending, compaction,
sintering
Ductility vs. malleability: - ANSWER-ductile = stretch without damage, stretched into
wires;
malleable = deformed under compression, rolled or hammered into sheets
What is work hardening for material that is ductile and malleable metal - ANSWER-is
strengthening of a metal by plastic deformation. Occurs most notably for ductile
metals.
Two systems used for measuring the hardness of heat-treated steels include: -
ANSWER-burnell hardness no. and rockwell c scale
Liquid phase sintering versus solid phase sintering: - ANSWER-L = requires adding
additive to powder, which melts before matrix phase .
S = heat treatment of powder compacts at elevated temperatures.
Which process provides high material removal rate? - ANSWER-plasma arc cutting
Property that allows metals to be permanently deformed beyond yield without failure
by
rupture or splitting is known as? - ANSWER-Plasticity
Name 3 types of stress - ANSWER-tensile, compressive, shear
AND ANSWERS
What is metal injection molding? - ANSWER-finely-powdered metal is mixed with
binder material making 'feedstock', which is then handled by plastic processing
equipment in injection mold forming (powdered metallurgy)
What fluid is used in ECM metal removal? - ANSWER-conductive fluid/electrolyte
What fluid is used for EDM metal removal? - ANSWER-dielectric fluid (deionized
water, oil- often kerosene based)
What is impregnation in terms of the powdered metallurgy process? - ANSWER-
filling a porous substrate to make it airtight. In powder metallurgy, impregnate inner
void prior to plating to reduce corrosion. Fill sintered component with lubricants
Machining process used to produce square blind hole in steel is? - ANSWER-RAM
EDM
Machining process used to produce narrow slot in hardened tool steel is? -
ANSWER-Laser beam cutting and water jet cutting
Three steps in powder metallurgy include: - ANSWER-blending, compaction,
sintering
Ductility vs. malleability: - ANSWER-ductile = stretch without damage, stretched into
wires;
malleable = deformed under compression, rolled or hammered into sheets
What is work hardening for material that is ductile and malleable metal - ANSWER-is
strengthening of a metal by plastic deformation. Occurs most notably for ductile
metals.
Two systems used for measuring the hardness of heat-treated steels include: -
ANSWER-burnell hardness no. and rockwell c scale
Liquid phase sintering versus solid phase sintering: - ANSWER-L = requires adding
additive to powder, which melts before matrix phase .
S = heat treatment of powder compacts at elevated temperatures.
Which process provides high material removal rate? - ANSWER-plasma arc cutting
Property that allows metals to be permanently deformed beyond yield without failure
by
rupture or splitting is known as? - ANSWER-Plasticity
Name 3 types of stress - ANSWER-tensile, compressive, shear
