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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
During metallurgical control, what is the amount of manganese that is lost?(a) 5%(b) 10%(c) 15%(d) 20% |
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Answer» Right choice is (c) 15% For explanation: During metallurgical control, the amount of manganese lost is about 15%. This loss takes place because of the presence of oxygen, that is, an oxidation reaction takes place. |
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| 2. |
_______densityin a material, is expressed as the total dislocation length per unit volume or, equivalently, the number of dislocations that intersect a unit area of a random section. (a) dislocation (b) Mass (c) deformation (d) Weight |
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Answer» Dislocation densityin a material, is expressed as the total dislocation length per unit volume or, equivalently, the number of dislocations that intersect a unit area of a random section. |
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| 3. |
Which of the following is also called as diffusion annealing?(a) Isothermal annealing(b) Process annealing(c) Homogenizing(d) Spheroidise annealing |
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Answer» Correct answer is (c) Homogenizing Easy explanation: Homogenising has another name as diffusion annealing. This method is applied to both the ingots, carbon as well as alloy steel. |
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| 4. |
What is contained inside the well of cupola?(a) Molten iron(b) Solid iron(c) Molten steel(d) Solid steel |
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Answer» The correct answer is (a) Molten iron The best I can explain: Inside the well of a cupola, there is molten iron collected. The well is positioned in between of bottom of tuyeres and tapered ram sand bottom. |
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| 5. |
High volume mould production is done using which sand?(a) Green sand(b) Dry sand(c) Loam sand(d) Sharp sand |
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Answer» Right answer is (a) Green sand For explanation: When it comes to the production of high volume core productions, the cost essentially should be low. High volume mould production is done using green sand only. |
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| 6. |
What is the percentage of carbon present in low alloy steel?(a) 0.15%(b) 0.2%(c) 0.25%(d) 0.3% |
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Answer» Right option is (c) 0.25% The explanation is: The amount of carbon that is present in a soft steel wire is around 0.1% to 0.18% and the amount of carbon in terms of percentage composition in low alloy steels is 0.25%. |
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| 7. |
What is the amount of carbon contained by a soft steel wire?(a) 0.1% to 0.18%(b) 0.15% to 0.22%(c) 0.18% to 0.26%(d) 0.2% to 0.27% |
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Answer» Correct option is (a) 0.1% to 0.18% The explanation: A soft steel wire contains about 0.1% to 0.18% of carbon. Soft steel wire also has other contents in it like phosphorous and sulphur in it. The amount of phosphorous is soft steel is around 0.0025%. |
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| 8. |
Which of the following process is done above the recrystallization temperature?(a) Hot forging(b) Cold forging(c) Impact forging(d) Gradual pressure forging |
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Answer» Right answer is (a) Hot forging To elaborate: Among hot forging, cold forging, impact forging and gradual pressure forging, hot forging is done above the recrystallization temperature, but below the melting point. |
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| 9. |
What is the amount of carbon present in low carbon steel?(a) Less than 0.5%(b) Less than 0.7%(c) Less than 0.4%(d) Less than 0.2% |
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Answer» The correct choice is (d) Less than 0.2% Best explanation: Low carbon steel has the lowest amount of carbon mixed with iron in the alloy. The amount of carbon present in low carbon steel is less than 0.2% and that of medium carbon steel has carbon composition of about 0.2% to 0.5%. |
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| 10. |
In which of the following defects is a crown formed?(a) Wavy edges(b) Alligatoring(c) Folds(d) Laminations |
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Answer» Correct choice is (a) Wavy edges For explanation: A crown shape gets formed by the material, due to rolling loads. Crowns get formed in wavy edge defect. |
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| 11. |
In two high rolling mill, what is the direction of rolling of the two rollers?(a) Clockwise-anticlockwise(b) Clockwise-clockwise(c) Anticlockwise-Anticlockwise(d) Stationery-clockwise |
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Answer» Correct choice is (a) Clockwise-anticlockwise Explanation: In two high rolling mill, the direction of both the rollers is opposite to one another. Hence, one clockwise while other anti-clockwise. |
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| 12. |
Which of the following is not a type of rolling mill?(a) Two-high rolling mill(b) Cluster rolling mill(c) Separation rolling mill(d) Tandem rolling mill |
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Answer» Correct answer is (c) Separation rolling mill Explanation: Among two-high rolling mill, cluster rolling mill, separation rolling mill and tandem rolling mill. Separation rolling mill is not a type of rolling mills. |
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| 13. |
Which among the following is not a cast iron?(a) White iron(b) Compacted graphite iron(c) Gray cast iron(d) Pig iron |
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Answer» Right option is (d) Pig iron The best explanation: Among the following, white iron, compacted cast iron and gray cast iron are different types of cast irons, but pig iron is not. It is from pig iron, that cast irons are made, by re-melting them. |
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| 14. |
Which of the following is the advantage of using the electron beam melting technology?(a) Low cost(b) Good surface finish(c) Low maintenance(d) Negligible impurities |
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Answer» The correct answer is (d) Negligible impurities Explanation: Electron beam melting is a vital technology in industries. This method has many advantages like high strength properties of metal, high energy level and the most important is the negligible impurities in the metal parts, because this process uses a vacuum chamber that eliminates the all kind of impurities like oxides, nitrides etc. |
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| 15. |
Which of the following forms of iron is least malleable?(a) Austenitic(b) Pearlitic(c) Ferritic(d) Martensitic |
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Answer» Right answer is (a) Austenitic The best explanation: Malleable irons are cast irons which are classified under iron base materials, under foundry metals and alloys. Among these phases of iron, the austenite phase of iron is measured to be showing the least amount of malleability. |
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| 16. |
On what does the reciprocating die stroke depend on?(a) Temperature(b) Pressure(c) Thread diameter(d) Die radius |
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Answer» Correct answer is (c) Thread diameter Best explanation: In a reciprocating flat die machine, the reciprocating die stroke depends upon the thread diameter, and there are 2 dies used in this apparatus, out of which, one is stationery. |
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| 17. |
In the following figure of the air furnace, what does the question mark represent?(a) Fire bridge(b) Skimming door(c) Hearth(d) Bungs |
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Answer» The correct option is (b) Skimming door To elaborate: The given figure is that of an air furnace or a reverberatory furnace. The question mark in the picture is depicting a skimming door. |
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| 18. |
The signal display of eddy current system does not take place on which of the following media?(a) Oscilloscope(b) Oscillograph(c) Electric tape(d) Magnetic tape |
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Answer» Right choice is (c) Electric tape The best explanation: Eddy current method is used as a non-destructive technique. Most of the times, a magnetic tape is used or a oscilloscope or an oscillograph, but not an electric tape. |
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| 19. |
Which of the following is not a type of developer?(a) Dry powder(b) Water soluble developer(c) Oil soluble developer(d) Water suspendible developer |
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Answer» The correct answer is (c) Oil soluble developer The best I can explain: Dye penetrant test is one of the methods of non-destructive testing of the components. The application of developer is one of the steps of inspection of dye penetrant test. Oil soluble developer is not a type of developer. |
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| 20. |
In the following figure of the air furnace, what does the question mark represent?(a) Bungs(b) Fire place(c) Fire bars(d) Hearth |
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Answer» Right option is (d) Hearth Easy explanation: The question mark in the picture is depicting a hearth. The given figure is that of an air furnace or a reverberatory furnace. This hearth finds its place above the fire bridge in the apparatus. |
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| 21. |
Which of the following processes is not the type of bulk forming process in the metal forming?(a) Bending(b) Rolling(c) Forging(d) Extrusion |
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Answer» Correct choice is (a) Bending Best explanation: Bulk forming is a deformation process which results in a massive shape change of the material. The ratio of surface area to volume of the material is relatively small. It includes processes like forging, extrusion and rolling. But the bending process is a part of sheet metal forming which has surface area to volume ratio relatively high. |
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| 22. |
Which of the following defect is not detected by dye penetrant test?(a) Non-metallic inclusions(b) Leaks(c) Cracks(d) Forging defects |
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Answer» Correct answer is (a) Non-metallic inclusions Explanation: Dye penetrant test is one of the methods of non-destructive testing of the components. Leaks, cracks and forging defects are some defects which can be identified by using dye penetrant test. But, for detecting non-metallic inclusions, one will have to do a magnaflux test. |
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| 23. |
Which of the following is not a type of penetrant application?(a) Dipping(b) Spraying(c) Brushing(d) Pouring |
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Answer» Right choice is (d) Pouring The best I can explain: The application of penetrant is one of the steps of inspection of the dye penetrant test. Among these, dipping, spraying or brushing are different ways by which penetrant can be applied, but not pouring. |
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| 24. |
For how long is a penetrant allowed to soak in cracks?(a) 5 to 15 minutes(b) 10 to 30 minutes(c) 15 to 35 minutes(d) 20 to 40 minutes |
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Answer» The correct option is (b) 10 to 30 minutes Explanation: None. |
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| 25. |
How much steel scrap is present in refined irons?(a) More than 25%(b) More than 60%(c) More than 50%(d) More than 95% |
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Answer» The correct answer is (c) More than 50% For explanation: Refined irons are considered to be the second best source of high carbon material. The steel scrap which is present in refined irons is a little more than 50%. |
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| 26. |
Which of the following is the drawback of using the sand casting process?(a) Limited alloys(b) Expensive mould(c) Uneconomical for low quantities(d) Labour intensive |
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Answer» Correct choice is (d) Labour intensive Best explanation: In sand casting process, the sand is rammed by using the rammer and then the cope and drag box are used as a moulding box to prepare the mould. In this process, much of time is spent and it requires too much labour work. So this method is normally used for small scale production for producing small size castings. |
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| 27. |
What is the minimum frequency accepted for the motor, used in current production of high frequency induction furnace?(a) 430 cycles/second(b) 500 cycles/second(c) 550 cycles/second(d) 600 cycles/second |
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Answer» The correct option is (b) 500 cycles/second For explanation I would say: In high frequency induction furnace, motors which are equipped for the production of high frequency current can have a minimum frequency of 500 cycles every second. |
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| 28. |
What is the maximum frequency accepted for the motor, used in current production of high frequency induction furnace?(a) 5000 cycles/second(b) 10000 cycles/second(c) 7500 cycles/second(d) 12500 cycles/second |
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Answer» Right answer is (b) 10000 cycles/second The best I can explain: Motors which are equipped for the production of high frequency current can have a maximum frequency of 10000 cycles every second, in high frequency induction furnace. |
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| 29. |
Which of the following can be controlled by a core type furnace for any material?(a) Pressure(b) Volume(c) Temperature(d) Rate of production |
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Answer» Right option is (c) Temperature For explanation: Any core type furnace can be used as a holding furnace for die casting as well as for permanent mold, as these furnaces are able to control the temperature of the metal. |
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| 30. |
What is the maximum frequency accepted for the spark gap converter, used in current production of high frequency induction furnace?(a) 70,000 cycles/second(b) 75,000 cycles/second(c) 80,000 cycles/second(d) 85,000 cycles/second |
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Answer» Correct answer is (c) 80,000 cycles/second To explain: None. |
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| 31. |
Which material is applied to the hearth if the process is basic?(a) Silica(b) Dolomite(c) Silicon monoxide(d) Xenon di fluoride |
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Answer» Correct choice is (b) Dolomite Explanation: None. |
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| 32. |
Which of the following material is used in converters for making steel?(a) White iron(b) Gray iron(c) Cast iron(d) Copper |
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Answer» Correct choice is (c) Cast iron The best I can explain: Among the following, cast irons are treated in converters where the cold air blast gets blown and steels are made. Apart from cast irons, pig irons are also used in converters for making steel. |
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| 33. |
Which of the following types of stresses is applied during the process of rod or tube drawing?(a) Shear(b) Direct compressive(c) Tensile(d) In-direct compressive |
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Answer» The correct answer is (c) Tensile The best explanation: Rod or tube drawing is a deformation process in which the metallic material in the form of cylindrical bar is pulled by the help of a converging die. In general, the tensile stress is applied during the process. The strain hardening occurs which makes the material very hard and strong by reducing its ductility. |
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| 34. |
What is the main source of high carbon steel material?(a) Pig iron(b) Cast iron(c) White iron(d) Steel scrap |
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Answer» The correct answer is (a) Pig iron To explain I would say: Steel scrap is a big source for high carbon steel materials, but is considered as the second biggest source. The main source for high carbon steel materials is pig iron. |
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| 35. |
The following figure represents which type of adhesive bonded joint?(a) Double butt lap excellent(b) Tongue and groove(c) Double tap good(d) Joggle tap better |
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Answer» Right answer is (a) Double butt lap excellent Easy explanation: None. |
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| 36. |
The following figure represents which type of adhesive bonded joint?(a) Beveled lap excellent(b) Plain lap good(c) Strap good(d) Joggle lap better |
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Answer» Right choice is (d) Joggle lap better The explanation is: The following figure would here represent a joggle lap better. An apparatus like this is used when the joint experiences loads and tensions. |
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| 37. |
Given: cupola diameter = 45cm, mass of bed charge = 325kg, height of groove = 6.5m. Find coke density.(a) 314.38 kg/m^3(b) 309.54 kg/m^3(c) 193.92 kg/m^3(d) 340.57 kg/m^3 |
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Answer» The correct choice is (a) 314.38 kg/m^3 Easy explanation: Here, d = 45cm = 0.45m, W = 325kg, height of groove, h = 6.5m. Therefore, according to the formula, W = π/4 x d^2 x h x w, => w= 325 / (π/4 x 0.45^2 x 325 x 6.5) => w = 314.38 kg/m^3. |
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| 38. |
In which of the following processes most noise is produced?(a) Press forging(b) Drop forging(c) Open die forging(d) Closed die forging |
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Answer» The correct answer is (b) Drop forging The best I can explain: Among the following processes, that is press forging, drop forging, open die forging and closed die forging, drop forging is a process where more amount of noise occurs. |
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| 39. |
What is the minimum efficiency, in general of a cupola?(a) 15%(b) 30%(c) 25%(d) 35% |
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Answer» The correct answer is (b) 30% Explanation: The minimum efficiency of a cupola is 30%, and that, the maximum efficiency is 50%. Hence, the efficiency ranges from 30 to 50% only. |
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| 40. |
Which of the following materials is not used in making rivets?(a) Wrought iron(b) Mild steel(c) Brass(d) Calcium |
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Answer» Right choice is (d) Calcium For explanation I would say: Among the following, calcium is not used the riveting process. For the making of rivets, the used materials are wrought iron and mild steels. There are other materials also used in it, but they are used for small works, such as brass, copper and aluminium. |
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| 41. |
What is the shape of the billet used in extrusion process?(a) Cubical(b) Spherical(c) Cylindrical(d) Pyramidal |
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Answer» Correct option is (c) Cylindrical Easiest explanation: The shape of the billet in an extrusion process is designed to be cylindrical only. A cubical or spherical or a pyramidal billet cannot be designed for a good output. |
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| 42. |
For baking standard core sand, the specimen needs to be heated at what temperature?(a) 800°F(b) 900°F(c) 1000°F(d) 1100°F |
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Answer» Right option is (c) 1000°F Explanation: The core sand has to be baked first and brought to a comparatively high temperature. For baking standard core sand, the specimen needs to be heated at about 1000°F and above it. |
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| 43. |
Which of the following is an advantage of high volume core production?(a) Durability(b) High strength(c) Low cost(d) Cures low volume production |
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Answer» The correct choice is (c) Low cost For explanation: The very basic requirements of high volume core production is, low cost and fast manufacturing. |
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| 44. |
Which of the following method is used for making crankshafts?(a) Drop forging(b) Press forging(c) Open die forging(d) Closed die forging |
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Answer» Right option is (a) Drop forging Explanation: For the making of products like car axles, crankshafts, leaf springs and jet turbines, the method of drop forging is used. |
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| 45. |
What is the range of efficiency of cupola?(a) 20% to 40%(b) 30% to 50%(c) 40% to 60%(d) 50% to 70% |
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Answer» The correct choice is (b) 30% to 50% To elaborate: The efficiency of cupola is decided by factors like heat used in preheating, heat used in coke, heat used in oxidation and heat in the air blast. The efficiency of a cupola varies from 30% to 50%. |
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| 46. |
When a material is being rolled, the perpendicular force on the arc is called what?(a) Thickness force(b) Roll force(c) Angle force(d) Die force |
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Answer» Correct answer is (b) Roll force Easiest explanation: There is a force perpendicular to the arc which is in contact when the rolls are pressurizing the material. This force is called a roll force. |
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| 47. |
How is the strength of the material, which is to be rolled, reduced?(a) Rolling at low temperatures(b) Rolling at high temperatures(c) Treating with ozone(d) Treating with carbon |
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Answer» Correct answer is (b) Rolling at high temperatures Best explanation: When the material to be squeezed is rolled at high temperatures, the strength of the material is found to decrease. |
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| 48. |
The following figure represents which defect?(a) Alligatoring(b) Zipper cracks(c) Folds(d) Laminations |
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Answer» The correct answer is (b) Zipper cracks The explanation: The following figure depicts in itself the defect, this crack is called as zipper cracks. A defect like zipper crack may occur when the rolls which are employed for it, get bended. |
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| 49. |
Before beginning the process, the ingots are heated up to what temperature?(a) 1000°C(b) 1200°C(c) 1400°C(d) 1600°C |
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Answer» The correct choice is (b) 1200°C Explanation: The material ingot is known for sustaining high temperature and heat conditions. Before the process begins, the ingot is fired using gas and brought up to a temperature of 1200°C. |
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| 50. |
With an increase in volume of air passed, what change is seen in the permeable number?(a) Increases(b) Decreases(c) No change occurs(d) No relation among the two |
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Answer» The correct answer is (a) Increases To explain: With an increase in the volume of air passed, there is an increase in the permeable number, since the two have a direct relation. |
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