The vacancy concentration during sintering

Which of the following components can be manufactured by powder metallurgy technique?

A. Cams

B. engine disks

C. connecting rod

D. All of these

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

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

Density in sintering product is improved by

A. Hot pressing

B. Cold pressing

C. Coining

D. Both B and C