Material Science Quiz 5

Which among the following is known as Schmid's factor?

• (cos² α) x (cos² β)

• (cos α) x (sin β)

• (sin α) x (sin β)

• (cos α) x (cos β)

Which of the following statements is/are true for cold working process?

1. Cold working process does not provide good surface finish

2. Cold working process produces internal stress in a metal

3. Fatigue strength of metals can be improved

4. Cold working process cannot take place below recrystallization temperature

• statement 1 and statement 2

• statement 2 and statement 3

• statement 3 and statement 4

• all the above statements are true

The materials are continuously magnetized throughout the operation in

• DC applications

• AC applications

• Both a. and b.

• None of the above

Which type of materials exhibit magnetism only in presence of an electric field?

• Diamagnetic materials

• Paramagnetic materials

• Ferromagnetic materials

• None of the above

Which type of cermets are used as an substitute for WC - Co alloy cutting tools?

• TiC - base cermets

• ThO₂ - W

• ThO₂ - Mo

• None of the above

Match the following group 1 items (Method of atomization) with group 2 items (Application) and select the correct option

1. D. P. G. Process --- A. Copper tube

2. Mannesmann process --- B. Aerospace

3. Dissolved gas atomization --- C. Electronic framework

4. Rotating electrodes atomization --- D. Aluminum powder as solid rocket fuel

• 1 – D, 2 – B, 3 – A, 4 – C

• 1 – C, 2 – A, 3 – D, 4 – B

• 1 – B, 2 – A, 3 – C, 4 – D

• 1 – C, 2 – D, 3 – B, 4 – A

The formula used to calculate green strength (S) is

• (2 B T) / (3 ω L)

• (3 ω L) / (2 B T²)

• (3 ω L) x (2 B T²)

• (3 ω L) x (2 B T)

Which of the following statements is true for green density?

• Green density increases when particle strength increases

• Green density decreases when compacting speed decreases

• Green density increases when compaction pressure increases

• Green density decreases when apparent density increases

Before compacting the metals, which process is annealed to remove the effects of cold working?

• Machining

• Crushing

• Shotting

• All of these

Which of the following statements is/are true for ultrasonic test?

• Equipment used for ultrasonic testing is portable

• Complicated shapes can be easily scanned

• Waves generated are health hazardous

• All the above statements are true