Powder Metallurgy Questions and Answers – Powder Manufacture – Alloy Powders

«
»

This set of Powder Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on “Powder Manufacture – Alloy Powders”.

1. Which of the following metal powder is used as a moderator in the atomic energy field?
a) Uranium carbide
b) Beryllium
c) Zirconium and its alloys
d) Thorium
View Answer

Answer: b
Explanation: Beryllium is used as a moderator (for controlling the speed of neutrons); uranium carbide as fuel material; zirconium and its alloys as cladding materials; and thorium as fertile material (a material, which is not itself fissile, that can be converted into a fissile material by irradiation in a reactor).
advertisement

2. Beryllium is used as a fuel canning material for nuclear reactors.
a) True
b) False
View Answer

Answer: a
Explanation: Beryllium is used as a fuel canning material because of its low- thermal neutron- absorption cross-section and good elevated temperature strength.

3. _______ has provided a metal powder designation system, according to which, metal and alloy powders are given a prefix and a four-digit code.
a) ASME
b) ASTM
c) MPIF
d) BIS
View Answer

Answer: c
Explanation: MPIF (Metal Powder Industries Federation, Princeton, New Jersey, USA) has provided a metal powder designation system, according to which, metal and alloy powders are given a prefix and a four-digit code. The prefix will refer to the metals present while the four-digit code will give the % of the alloying elements present. The minimum yield strength is referred to by another two-digit code at the end.
advertisement
advertisement

4. Which of the following methods have been developed for the production of complex powders?
a) Atomization and Milling
b) Atomization, Thermal decomposition, Electrolysis, and spray drying
c) Atomization, Thermal decomposition, and Graining
d) Atomization and Electrolysis
View Answer

Answer: b
Explanation: In recent years, four methods have been developed for production of complex powders: (1) atomization process, (2) combined precipitation in the thermal decomposition of carbonyls, (3) combined precipitation of metals in electrolysis, and (4) spray drying.

5. Complex alloy powders can be produced by electrolytic deposition method by using _____methods.
a) Electrolyte mixture, anode made of cast alloy, and composite anodes
b) Composite cathodes
c) Composite anodes
d) Electrolyte mixture and composite anodes
View Answer

Answer: a
Explanation: Complex alloy powders can be produced by electrolytic deposition method by using (1) a mixture of electrolytes containing two or more metal salts, (2) cast alloy of required composition as the anodes, or (3) composite anodes of the appropriate metal and alloy component.
advertisement

6. Spray drying produces a superalloy powder with dispersed _____
a) Thoria
b) Oxalate
c) Nickel
d) Copper
View Answer

Answer: a
Explanation: Spray drying, consists of contacting a spray (of an aqueous mixture of salts such as Co oxalate, Ni oxalate, Cr acetate, Mo trioxide and thorium nitrate containing low solid content) with a blast of hot air, calcining the dried mass to convert all the metal compounds to the oxides at 800°C in air and reduction in hydrogen in order to produce a superalloy powder with dispersed thoria.

7. The alloy F-0000-10 refers to pure fluorine powder with anultimate breaking strength of 10 ksi.
a) True
b) False
View Answer

Answer: b
Explanation: The alloy F-0000-10 refers to pure iron powder with a yield strength or nominal strength of 10 ksi. This designation is given by the MPIF (Metal Powder Industries Federation, Princeton, New Jersey, USA) has provided a metal powder designation system, according to which, metal and alloy powders are given a prefix and a four-digit code.

Sanfoundry Global Education & Learning Series – Powder Metallurgy.

advertisement

To practice all areas of Powder Metallurgy, here is complete set of 1000+ Multiple Choice Questions and Answers.

advertisement

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & technical discussions at Telegram SanfoundryClasses.