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51.

Which of the following metals are regarded as refractory metals?(a) Niobium and tungsten(b) Molybdenum only(c) Niobium, molybdenum, and tungsten(d) Tungsten and molybdenum onlyI got this question in an interview for internship.My question comes from Materials topic in section Materials of Corrosion Engineering

Answer» RIGHT ANSWER is (c) Niobium, MOLYBDENUM, and tungsten

To EXPLAIN I would say: Refractory metals are characterized by very high melting points with limited CORROSION resistance. Tantalum, niobium, molybdenum, tungsten, and zirconium are regarded as refractory metals.
Discussion
52.

Which of the following metals has a Hexagonal closed packed structure?(a) Cadmium(b) Magnesium(c) Zirconium(d) Cadmium, magnesium, and zirconiumI got this question by my school principal while I was bunking the class.The question is from Materials in chapter Materials of Corrosion Engineering

Answer»

The CORRECT choice is (d) Cadmium, MAGNESIUM, and zirconium

Easiest explanation: Crystal structures are classified into 14 DIFFERENT types KNOWN as Bravais lattice based on the shape of the UNIT cell and position of atoms in it. Cadmium, magnesium, zirconium, titanium, zinc, and beryllium are examples of hexagonal closed packed structures.
Discussion
53.

Which of the following is the monomer of Polyvinyl chloride (PVC)?(a) CF2=CF2(b) CH2=CH-Cl(c) COOH-CH2-CH2-CH2–CH2COOH(d) C6H5-CH=CH2I have been asked this question by my college professor while I was bunking the class.The above asked question is from Materials topic in section Materials of Corrosion Engineering

Answer»

Correct OPTION is (b) CH2=CH-Cl

To elaborate: Vinyl CHLORIDE (CH2=CH-Cl) is the monomeric unit of polyvinyl chloride. It is USED for piping and cable INSULATION EXTENSIVELY. CF2=CF2, COOH-CH2-CH2-CH2–CH2COOH and C6H5-CH=CH2 are the monomers of Teflon, nylon, and polystyrene respectively.
Discussion
54.

Which of the following statements are correct regarding the austenite phase in an iron-carbon phase diagram?(a) It is non-magnetic in nature(b) The maximum percentage of carbon is 2.1%(c) It has a face-centered cubic structure(d) The austenitic phase has a face-centered cubic structure with a 2.1% maximum percent carbon and non-magnetic in nature.This question was posed to me during a job interview.This interesting question is from Materials in chapter Materials of Corrosion Engineering

Answer» CORRECT option is (d) The austenitic phase has a face-centered cubic STRUCTURE with a 2.1% maximum percent carbon and non-magnetic in nature.

The BEST I can explain: Austenite is one of the phases in the iron-carbon phase DIAGRAM. It has a face-centered cubic structure with 2.1% maximum percent carbon and it is non-magnetic in nature.
Discussion
55.

Which of the following is/are the types of cast irons?(a) Gray cast iron(b) Malleable cast iron(c) Nodular cast iron(d) Gray cast iron, malleable cast iron, and nodular cast ironI got this question in an international level competition.This interesting question is from Materials in portion Materials of Corrosion Engineering

Answer»

The correct ANSWER is (d) Gray cast IRON, malleable cast iron, and NODULAR cast iron

To ELABORATE: Cast iron is a GENERIC term that applies to the high carbon-iron alloys containing silicon. Types of cast irons are gray cast iron, white cast iron, malleable cast iron, and nodular cast iron.
Discussion