Introduction to Metallurgy MCQ Questions and Answers

51

The wavelength of UV spectrum ranges

A) 400 nm to 700 nm B) 700 nm to 1 mm C) 0.01 nm to 10 nm D) 10 nm to 400 nm

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Answer & Solution

Answer: Option D

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52

Which of the following is disadvantage in contact mode scaning

A) Higher possibility of tip damage B) Slow scan speed C) Can't be done for rough sample D) Very poor resolution of scanning

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Answer & Solution

Answer: Option A

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53

Copper can be reduced from acidic copper sulphate solution by

A) Silver B) Iron C) Carbon D) Lead

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Answer & Solution

Answer: Option B

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54

For sintering of green powder compacts of copper, choose the correct statement:
P. Sintering should be done in an inert or reducing atmosphere.
Q. At a given sintering temperature, the rate of shrinkage will be higher for finer powder size.
R. Full density parts can be produced in a finite time by solid state sintering
S. Sintered compacts will have a higher strength than those made by metal working

A) P, Q B) Q, R C) P, R D) Q, S

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Answer & Solution

Answer: Option A

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55

Match the operations listed in Group I with the type of processes listed in Group II.

Group-I	Group-II
P. Blast Furnace Iron making	1. Refining
Q. BOF Steel making	2. Electrolysis
R. Hall-Heroult Process	3. Smelting
S. Bayer Process	4. Leaching

A) P-1, Q-3, R-2, S-4 B) P-3, Q-1, R-2, S-4 C) P-4, Q-2, R-3, S-1 D) P-3, Q-1, R-4, S-2

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Answer & Solution

Answer: Option B

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56

A rod of a metal with Young's modulus of 200 GPa is pulled in tension to a stress of 400 MPa. What is the elastic strain (in %) that is recovered, when the rod is completely unloaded?

A) 0.1 B) 0.2 C) 0.3 D) 0.4

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Answer & Solution

Answer: Option B

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57

Match the following:

Group 1	Group 2
P. Dulong formula	1. Ultimate analysis
Q. Carbon	2. Gray body
R. Dwight-Lloyd machine	3. Sintering
S. Radiation	4. Refractory

A) P-1, Q-2, R-3, S-4 B) P-2, Q-4, R-3, S-1 C) P-1, Q-4, R-3, S-2 D) P-3, Q-1, R-4, S-2

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Answer & Solution

Answer: Option C

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58

Match the following:

Group 1	Group 2
P. Hall petch relation	1. Bulk diffusion between grain boundaries
Q. Orowan mechanism	2. Fracture of brittle materials
R. Nabarro-Herring creep	3. Grain boundary strengthening
S. Griffith criterion	4. Dispersion strengthening

A) P-1, Q-2, R-3, S-4 B) P-2, Q-3, R-4, S-1 C) P-4, Q-1, R-2, S-3 D) P-3, Q-4, R-1, S-2

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Answer & Solution

Answer: Option D

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59

For the following electrochemical reaction Sn + 2H⁺= Sn²⁺ + H₂ if the solution has Sn²⁺ concentration 10^-2 M and pH 5 at 298 K, which of the following is true?
Given: standard reduction potential for Sn²⁺ + 2e- → Sn is - 0.136 V versus SHE; pH₂ = 1 atm

A) Sn undergoes oxidation B) H⁺ undergoes reduction C) Sn²⁺ undergoes reduction D) No net reaction

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Answer & Solution

Answer: Option C

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60

Oil impregnated bonze bearings are manufactured using

A) Pressure die casting B) centrifugal casting C) solid-state sintering D) liquid phase sintering

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Answer & Solution

Answer: Option C

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Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering