Power Metallurgy and Processes - Mechanical Engineering (MCQ) questions and answers

1)   Which type of microscope is used to determine particle diameter between (10 to 0.001 μ)?

a. Optical microscope
b. Electron microscope
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Electron microscope

Explanation:
No explanation is available for this question!
2)   What is meant by atomization?

a. Process of disintegrating molten metal into small particles by use of compressed air
b. Process of fusing small particles of metals into molten mass by water
c. None of the above

Answer  Explanation 

ANSWER: Process of disintegrating molten metal into small particles by use of compressed air

Explanation:
No explanation is available for this question!
3)   Before compacting the metals, which process is annealed to remove the effects of cold working?

a. Machining
b. Crushing
c. Shotting
d. All of these
Answer  Explanation 

ANSWER: Shotting

Explanation:
No explanation is available for this question!
4)   Which of the following statements is true for green density?

a. Green density increases when particle strength increases
b. Green density decreases when compacting speed decreases
c. Green density increases when compaction pressure increases
d. Green density decreases when apparent density increases
Answer  Explanation 

ANSWER: Green density increases when compaction pressure increases

Explanation:
No explanation is available for this question!
5)   The formula used to calculate green strength (S) is

a. (2 B T) / (3 ω L)
b. (3 ω L) / (2 B T2)
c. (3 ω L) x (2 B T2)
d. (3 ω L) x (2 B T)
Answer  Explanation 

ANSWER: (3 ω L) / (2 B T2)

Explanation:
No explanation is available for this question!
6)   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

a. 1 – D, 2 – B, 3 – A, 4 – C
b. 1 – C, 2 – A, 3 – D, 4 – B
c. 1 – B, 2 – A, 3 – C, 4 – D
d. 1 – C, 2 – D, 3 – B, 4 – A
Answer  Explanation 

ANSWER: 1 – C, 2 – A, 3 – D, 4 – B

Explanation:
No explanation is available for this question!
7)   Which type of cermets are used as an substitute for Wc - Co alloy cutting tools?

a. Tic - base cermets
b. ThO2 - W
c. ThO2 - Mo
d. None of the above
Answer  Explanation 

ANSWER: Tic - base cermets

Explanation:
No explanation is available for this question!
8)   At critical speed of rotation, ball mill rotates at

a. high speed
b. low speed
c. neither slow nor very high speed
d. none of the above
Answer  Explanation 

ANSWER: neither slow nor very high speed

Explanation:
No explanation is available for this question!
9)   Which of the following statements is/are true?

a. Reduction method produces iron powders which are perfectly spherical
b. Drawback of high oxide formation in shotting processes can be reduced with use of inert gases
c. At certain temperature and pressure carbonyl of metal decomposes to give water and metal
d. All of the above
Answer  Explanation 

ANSWER: Drawback of high oxide formation in shotting processes can be reduced with use of inert gases

Explanation:
No explanation is available for this question!
10)   In physico - chemical processes, which factors affect reduction method?

a. Size of particles
b. Shape of materials
c. Reducing agent
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!
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