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Metallurgy Test Quiz | Metallurgy Test Multiple Choice Questions(MCQs) & Answers

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Free download in PDF Metallurgy Test Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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(1) Corrosion fatigue is a combined effect of _____
[A] Corrosive environment and mechanical stresses
[B] Cyclic loading and corrosion
[C] Velocity and mechanical stresses
[D] None of the above
Answer: Cyclic loading and corrosion
(2) Which of the following corrosions are caused due to velocity of fluid flow in pipes?
[A] Bimetal corrosion
[B] Cavitation corrosion
[C] Galvanic corrosion
[D] Intergranular corrosion
Answer: Cavitation corrosion

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(3) Which type of chemical reaction is observed at cathode, in electrochemical corrosion?
[A] Oxidation reaction
[B] Peretectic reaction
[C] Reduction reaction
[D] None of the above
Answer: Reduction reaction
(4) What is meant by corrosion?
[A] Chemical reaction between anode, cathode and electrolyte, which leads to loss of metal
[B] Deterioration of metals due to reaction with its environment
[C] Both a. and b.
[D] None of the above
Answer: Both a. and b.
(5) Chemical action during corrosion converts metal into metallic component as ________
[A] hydroxide
[B] oxide
[C] sulphate
[D] all of the above
Answer: all of the above
(6) In which of the following methods, surface of a steel component becomes hard due to phase transformation austenite to martensite?
[A] Carbonitriding
[B] Flame hardening
[C] Both a. and b.
[D] None of the above
Answer: Flame hardening
(7) Which of the following methods measure hardenability of a metal?
[A] Brinell hardness method
[B] Gross Man's method
[C] Rockwell hardness method
[D] All of the above
Answer: Gross Man's method
(8) Which of the following processes permit the transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion?
[A] Martempering
[B] Marquenching
[C] Both a. and b.
[D] None of the above
Answer: Both a. and b.
(9) The process of decomposing martensitic structure, by heating martensitic steel below its critical temperature is called as _______
[A] Austenitizing
[B] Quenching
[C] Tempering
[D] None of the above
Answer: Tempering
(10) Which transformation starts after the nucleation of ferrite phase?
[A] Bainite transformation
[B] Pearlite transformation
[C] Both a. and b.
[D] None of the above
Answer: Bainite transformation
(11) Which of the following statements is/are true about Iron in Iron-Carbon equilibrium diagram ?

1. It is soft and ductile

2. It is allotropic in nature

3. It is magnetic above curie temperature

4. Below the temperature of 1539 oC, iron is in liquid state

[A] 1 and 2
[B] 2 and 3
[C] 3 and 4
[D] All of the above
Answer: 1 and 2
(12) In Iron-Carbon equilibrium diagram, at which temperature cementite changes from ferromagnetic to paramagnetic character?
[A] 190 oC
[B] 210 oC
[C] 276 oC
[D] None of the above
Answer: 210 oC
(13) Which of the following phases has a complex orthorhomic crystal structure?
[A] δ-ferrite
[B] α-ferrite
[C] Austenite
[D] Cementite
Answer: Cementite
(14) What is the crystal structure of δ-ferrite?
[A] Body centered cubic structure
[B] Face centered cubic structure
[C] Orthorhomic crystal structure
[D] None of the above
Answer: Body centered cubic structure
(15) Austenite phase in Iron-Carbon equilibrium diagram _______
[A] is face centered cubic structure
[B] has magnetic phase
[C] exists below 727 oC
[D] all of the above
Answer: is face centered cubic structure
(16) The cooling curve formed when a material is solidified due to latent heat of fusion is called as ______.
[A] Undercooling
[B] Solidification
[C] Thermal arrest
[D] Thermometry
Answer: Thermal arrest
(17) What is meant by recalescence in cooling curves?
[A] Time required for liquefying solid components
[B] Time required for completely solidifying the casted components
[C] The cooling curve formed due to latent heat of fission
[D] Liberated heat increases temperature of an under cooled liquid metal during nucleation
Answer: Liberated heat increases temperature of an under cooled liquid metal during nucleation
(18) In microscopy, which illumination parameter is used for producing images with dark non-flat structure and bright back ground?
[A] Bright field illumination
[B] Dark field illumination
[C] Both a. and b.
[D] None of the above
Answer: Bright field illumination
(19) The study of metallographic includes ____
[A] alloy constituents
[B] failure analysis
[C] metal structure
[D] all of the above
Answer: all of the above
(20) In metallography, microscopic method provides information about _____
[A] impurities in a metal
[B] location and extent of segregation
[C] uniformity of structure
[D] all of the above
Answer: impurities in a metal

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