Powder Metallurgy MCQ Questions and Answers

31

Porous product can be effectively produced by using

A) Powder metallurgy B) casting C) forging D) None of these

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Answer & Solution

Answer: Option A

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32

With regard to BET gas adsorption method and Darcy's gas permeability method, which of the following is true

A) Both these methods take into account only the open pores B) Both these methods take into account only the closed pores C) BET method measures surface area related to both closed pores as well as open pores D) Gas permeability method measures surface area related to both closed pores as well as open pores

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Answer & Solution

Answer: Option C

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33

Metal powders treatment is refer to

A) improve physical properties B) improve chemical properties C) improve electrical properties D) improve physical and chemical properties

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Answer & Solution

Answer: Option D

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34

Usually powder particles show this kind of distribution

A) Poisson distribution B) Normal distribution C) Random distribution D) Log-Normal distribution

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Answer & Solution

Answer: Option D

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35

Which of the following is highest density in sintering process

A) apparent density B) green density C) sinter density D) tap density

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Answer & Solution

Answer: Option C

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36

The driving force of the sintering process depends on the term/terms

A) Stress B) Vapour pressure C) vacancy concentration D) Stress, vapour pressure and vacancy concentration

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Answer & Solution

Answer: Option D

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37

The increase in density and strength of powder compacts for a given strip thickness can be achieve by

A) increase in roll diameter B) decrease in roll diameter C) independent of roll diameter D) None of these

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Answer & Solution

Answer: Option A

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38

For powder of Aluminium and its alloys, the sintering temperature and time is

A) 400° - 600°C, up to 20 hrs B) 370° - 500°C, up to 24 hrs C) 550° - 700°C, up to 22 hrs D) 250° - 350°C, up to 18 hrs

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Answer & Solution

Answer: Option B

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39

Pick out correct option for bulk transport phenomena of mechanism of mass transport during sintering are

A) surface transport and bulk transport B) Evaporation condensation and surface diffusion C) Volume diffusion and surface diffusion D) Volume diffusion and grain boundary diffusion

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Answer & Solution

Answer: Option D

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40

Glaze coatings are applied on the green body by

A) dryers B) wrapping C) spraying D) punching

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Answer & Solution

Answer: Option C

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Powder Metallurgy MCQ Questions and Answers | Metallurgical Engineering