21. At what temperature material heated in reheating furnace before hot rolling?
22. Match entities listed in Column I with their correct dimensions given in Column II.
Column I
Column II
P. Drag coefficient
1. ML-1 T-1
Q. Mass transfer coefficient
2. ML-2 T-1
R. Viscosity
3. M0 L0 T0
S. Mass flux
M0 LT-1
| Column I | Column II |
| P. Drag coefficient | 1. ML-1 T-1 |
| Q. Mass transfer coefficient | 2. ML-2 T-1 |
| R. Viscosity | 3. M0 L0 T0 |
| S. Mass flux | M0 LT-1 |
23. In hot forging
24. For cold rolling
25. Match the properties in Group I with the units in Group II.
Group I
Group II
P. Thermal conductivity
1. J.m-2s-1k-1
Q. Heat transfer coefficient
2. J.m-1s-1k-1
R. Specific heat
3. m.s-1
S. Diffusivity
4. J.mol2s-1
| Group I | Group II |
| P. Thermal conductivity | 1. J.m-2s-1k-1 |
| Q. Heat transfer coefficient | 2. J.m-1s-1k-1 |
| R. Specific heat | 3. m.s-1 |
| S. Diffusivity | 4. J.mol2s-1 |
26. For a polymer reinforced with 40 vol.% glass fiber, the elastic modulus (in GPa) along the transverse direction is
[Eglass fiber = 70 GPa; Epolymer = 6.5 GPa]
[Eglass fiber = 70 GPa; Epolymer = 6.5 GPa]
27. Graphite fibres are used to make undirectional Al-matrix composites. Young's modulus of graphite and aluminium are 400 GPa respectively. If a composite contains 60 volume % of fiber and is loaded along the fiber direction, the Youngs Modulus of the composite is . . . . . . . . GPa.
28. For most extrusion operations, the optimum semi die angle is between
29. Work hardening of materials is due to
30. The effect of viscosity on the fluidity of liquid is
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