Which of the following components can be manufactured by powder metallurgy technique?
A. Cams
B. engine disks
C. connecting rod
D. All of these
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Advantages of Casting are: (I) Can create complex part geometries, 3-D shapes (II) Can create both external and internal shapes and large hollow shapes (III) It is a near net shape process for small to large parts (IV) Very good mechanical strength can be obtained for as-cast component
A. III is true, but I, II and IV are not true
B. I and IV are true, but II and III are not true
C. I, II, III and IV are not true
D. I, II and III are true, but IV is not true
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During hot isostatic pressing of powder particulates, the pressure and temperatures are
A. in the range of 4 to 30MPa and 500 to 2200°C respectively
B. in the range of 40 to 300MPa and 500 to 2200°C respectively
C. in the range of 30 to 300MPa and 500 to 2200°C respectively
D. in the range of 40 to 300MPa and 50 to 220°C respectively
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Density in sintering product is improved by
A. Hot pressing
B. Cold pressing
C. Coining
D. Both B and C
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In case of binary alloys, when the tangent touches plot for two phases, it means that at that composition, chemical potential of component A in both phases are
A. Same
B. different
C. undecided
D. all of these
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In ultrarapid solidification process of powder production, the rate of cooling is
A. 100 C/s
B. 1000 C/s
C. 200 C/s
D. 400 C/s
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Powder Metallurgy is the branch of metallurgy in which parts are produced by
A. Solidification of liquid metal
B. Solidification of gas metal
C. Sintering of powder
D. None of these
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The statement of sintering "The thermal treatment of a powder or compact, at a temperature below the melting point of the main constituent for the purpose of increasing its strength" is given by
A. F. Thrummler
B. ISO 3252
C. G. C. Kuczynski
D. None of these
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During intermediate steps the pores are situated at the intersection of three or four
A. unit cell
B. atoms
C. grain boundaries
D. molecules
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For random distribution of particle size, standard deviation is defined in such a way that:
A. Any number od data may lie within -1σ to +1σ
B. At least 75% data lie within -1σ to +1σ
C. At least 88.8% data lie within -2σ to + 2σ
D. At least 75% data lie within -3σ to + 3σ
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Which of the following method is used to produce powder in powder metallurgy?
A. Mechanical methods
B. Physical methods
C. Chemical methods
D. All of these
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Vacuum atomization is also known as . . . . . . . .
A. RSP
B. Ultrasonic atomization
C. Soluble gas atomization
D. REP
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The particle shape influences
A. flowability of powders
B. packing efficiency
C. interaction with fluids
D. all of these
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Pick best answer for following statements
A. spherical particles have lower inter-particle friction
B. smaller particles have higher inter-particle friction
C. particles flow easily with lower interparticle friction
D. all of these
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Advantages of powder metallurgy are
A. Efficient material utilization
B. Good surface finish
C. Manufacture of complex shapes possible
D. all of these
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Which of the following term can be used to describe a cemented carbide:
A. Ceramic
B. Cermet
C. Composite
D. metal
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The sintering of powder particulates is completed in how many stages
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Which of the following is (are) true regarding powder metallurgy?
1. Zero or minimal scrap
2. No secondary operation
3. Poor surface finish
4. High dimensional accuracy of components manufactured
A. Only 1, 2 and 3 are true
B. Only 1 and 2 are true
C. All 1, 2, 3 and 4 are true
D. Only 1, 2 and 4 are true
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The mass of the balls in vibratory ball mill
A. 8 - 10 times the charged particles
B. 2 times the charged particles
C. 100 times the charged particles
D. 5 times the charged particles
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The process of infiltration in sintered products is to improve
A. surface finish
B. coherent property
C. porosity
D. dimensional accuracy
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