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Mechanical Engineering
1000 Powder Metallurgy
Quiz 2
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Q.1
Which of the following solution is used to fill the dew cup for carrying out moisture analysis?
a) Acetone
b) Carboxylic acid
c) Propane
d) Ethyl alcohol
Q.2
Which of the following is not a characteristic of infiltrant?
a) Must not alloy or react with the skeleton metal
b) Good or perfect wetting
c) High surface tension
d) Melting point lower than the skeleton metal
Q.3
Which of the following treatment is given to a thin-walled bushing that is oversize on both inside and outside diameter?
a) Negative sizing on both inside and outside
b) Positive sizing on both inside and outside
c) Positive sizing on inside, and negative sizing on outside
d) Positive sizing on outside, and negative sizing on inside
Q.4
Which of the following is not a benefit of impregnation?
a) Dimensional tolerance
b) Improved machinability
c) Pressure-tightness
d) Porosity elimination
Q.5
Which of the following are major components of atomization set-up?
a) Melting, atomization chamber, collection tank
b) Melting and superheating facility
c) Melting, atomization chamber, dry collection
d) Melting, atomization chamber
Q.6
Which of the following are the stages of sintering, according to Sauerwald theory?
a) Adhesion, crystallization
b) Adhesion, recrystallization
c) Adhesion, bonding
d) Adhesion
Q.7
Which of the following is not a mechanism of by which surface transportation occur during solid-state sintering?
a) Viscous flow
b) Volume diffusion
c) Surface diffusion
d) Plastic flow
Q.8
Which of the following condition is necessary for obtaining consistent and satisfactory sintered components?
a) Short sintering time
b) Long sintering time
c) High power consumption
d) More labor cost
Q.9
Which of the following are the important temperature controls used in sintering furnace?
a) Radiation pyrometers
b) Thermocouple
c) On-off controllers and proportional controllers
d) On-off controllers
Q.10
Which of the following treatment fives a ferrito-pearlitic structure in P/M steel forgings?
a) Hardening
b) Nitrocarburizing
c) Tempering
d) Annealing
Q.11
Which of the following kind of porosity leads to longer tool life?
a) Either very high or very low
b) Very high
c) Moderate
d) Very low
Q.12
Which of the following is not a characteristic of the bearings produced from iron?
a) High porosity
b) Good wear resistance
c) Low-oil-volume capacity
d) High-oil-volume capacity
Q.13
Which of the following is not a type of bearing?
a) Babbit backed steel
b) Steel backed steel
c) Unbacked bearings
d) Teflon bearing
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