Question 1. The process of reducing the ore with carbon in the presence of flux is known as
Right answer is: B : smelting
Question 2. In froth floatation process, which one of the following acts a depressors
C. Pine oil
Right answer is: B : NaCN
Explanation : NaCN is used as depressors in froth floatation process. Depressors render a surface inactive toward a collector.
Question 3. Which one of the following process has the objective of Precipitation of metal in aqueous solution
Right answer: B : Cementation
Explanation : Cementation is contact reduction process. Cementation may be defined as precipitation of metal in aqueous solution of it's salts. Cementation is contact reduction process. Cementation may be defined as precipitation of metal in aqueous solution of it's salts .
Question 4. which one of the following process has the objective of Selective dissolution of metal.
Right answer is: B : Leaching
Description: In the hydrometallurgical route for the extraction of metals leaching is used. Leaching is the process of extracting substances from a solid by dissolving them in a liquid.
Question 5.Which is closest to the purest form of the iron?
A. Cast Iron
B. Wrought Iron
C. Pig Iron
Right answer is: B : Wrought Iron
Question 6. Which one of the following is not the irregularitie of the blast furnace?
Right answer is: C : Tapping
Question 7. Which one of the following is not the zone of the blast furnace?
A. Granular zone
B. Adhesive zone
C. Cohesive zone
D. Tuyere zone
Right answer: B : Adhesive zone
Question 8. Which one of the following furnace can be used to produce Alloy steels
A. L D process
B. open hearth furnace
C. Electric Arc furnace
D. Acid Bessemer process
Right answer: C : Electric Arc furnace
Question 9. The important factors for producing low silicon pig iron in a blast furnace are
A. Higher temperature and higher basicity
B. Lower temperature and lower basicity
C. Lower temperature and higher basicity
D. Higher temperature and lower basicity
Right answer: C : Lower temperature and higher basicity
Question 10. Which one of the following type of the reactor is used in LD Steel making
A. Fluidized bed reactor
C. Penumatic reactor
D. Travelling grate reactor
Right answer is: C : Penumatic reactor
Question 11. Precision forging with close dimensional tolerances can be produced by
A. Open-die forging
B. Close-die Forging
C. Both A & B
Right answer: B : Close-die Forging
Explanation : In closed die forgings the workpiece is deformed under high pressure in a closed cavity and thus precision forgings with closed dimensional tolenrances can be produced.
Question 12. Which of the following powder production method is a Physical Method for production of powders by powder metallurgy route
B. arbonyl process
C. Electrolytic deposition
D. both a and c
Right answer is: D : both a and c
Explanation : Physical method of powder production include Atomization and electrolytic deposition.
Question 13. Cobalt-60 is used as a source of _____ in industrial radiography and in therapy.
Right answer is: D : gamma-rays
Question 14. (50-70)% copper and (30-40)% lead alloy is used in the manufacture of:
A. electric insulator
C. cartridge cases
D. conveyor roller
Right answer is: B : Bearing
Question 15. Hindalium is an alloy of aluminium and _____
Right answer is: C : Magnesium
Question 16. One of the yielding criteria for ductile material is Von Mises Criteria also known as
A. Maximum shear stress criteria
B. Minimum shear stress criteria
C. Creation energy criteria
D. Distortion energy criteria
Right answer is: D : Distortion energy criteria
Question 17. Which one of the following instrument can be used for observing edge dislocation during the analysis of a sample in the lab
A. Scanning electron microscopy
B. Transmission electron microscopy
C. Atomic spectroscopy
D. Optical microscopy
Question 18 : Angle between burger vector and tangent vector for screw dislocation is
A. 0 degree
B. 30 degree
C. 45 degree
D. 90 degree
Question 19. Ferrous alloys with less carbon content are more susceptible to corrosion sensitization.
C. Can not be determined
D. Corrosion does not depends on C content
Right answer is: B : False
Explanation : A lower carbon content pushes the nose on the CCT curve to the right, allowing a larger window of cooling time. This makes low carbon ferrous alloys less susceptible to corrosion sensitization.
Question 20. The attractive forces between metal ions and delocalized electrons can be weaken or overcome by
B. High Temperature
D. All of the above