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)
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
What is ultrasonic machining and can it be used for both metallic and nonmetallic
materials? - ANSWER-it is a vibrating, oscillating tool used to remove material from a
workpiece with the help of an abrasive slurry flowing freely between the workpiece
and tool. Can be used for every material.
(Advantages: little grinding pressure, good for brittle materials especially glass,
ceramics, semiconductors.)
Are applications of electron beam machining limited to metallic materials? Why or
why not? - ANSWER-Can only be used on metal bc electron melts metal. The
energy and power density can be controlled and high velocity electrons can be
concentrated to a narrow beam.
What type of rockwell hardness scale indenter is used to measure the hardness of
heat treated high-carbon steel - ANSWER-120 degree diamond cone
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
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)
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
What is ultrasonic machining and can it be used for both metallic and nonmetallic
materials? - ANSWER-it is a vibrating, oscillating tool used to remove material from a
workpiece with the help of an abrasive slurry flowing freely between the workpiece
and tool. Can be used for every material.
(Advantages: little grinding pressure, good for brittle materials especially glass,
ceramics, semiconductors.)
Are applications of electron beam machining limited to metallic materials? Why or
why not? - ANSWER-Can only be used on metal bc electron melts metal. The
energy and power density can be controlled and high velocity electrons can be
concentrated to a narrow beam.
What type of rockwell hardness scale indenter is used to measure the hardness of
heat treated high-carbon steel - ANSWER-120 degree diamond cone
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
