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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. |
Film extrusion process, best involves film having a thickness below what length?(a) 0.2 mm(b) 0.3 mm(c) 0.4 mm(d) 0.5 mm |
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Answer» The correct option is (d) 0.5 mm Best explanation: Extrusion of films is one of the most important processes in extrusion. For the films having a thickness below 0.5 mm, these films are best suited for extrusion and can be further applied for making various bags. |
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| 2. |
Eddy current inspection method cannot be detect which of the following defect?(a) Laps(b) Seams(c) Voids(d) Surface crack |
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Answer» Correct choice is (d) Surface crack To explain: None. |
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| 3. |
Why are core prints added to the patterns when cores are used?(a) They provide different cooling rates to the core(b) They provide support to the cores and strength to the mould and core itself(c) They are used to ease the removal of a core(d) They are used to manufacture cores |
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Answer» Right choice is (b) They provide support to the cores and strength to the mould and core itself Explanation: Core prints provide support to the cores which are not stable by themselves. |
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| 4. |
Which of the following defect occurs because of the bending of rolls?(a) Zipper cracks(b) Folds(c) Laminations(d) Alligatoring |
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Answer» The correct answer is (a) Zipper cracks For explanation: Wavy edges and zipper cracks can occur as defects in the material, if the rolls are bended, but not, folds or laminations or alligatoring. Their causes of occurrence are different. |
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| 5. |
What is the maximum thickness that can be welded in ultrasonic welding?(a) 1.8 mm(b) 2.1 mm(c) 2.3 mm(d) 2.5 mm |
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Answer» Right answer is (d) 2.5 mm Explanation: Weldings such as spot welding or continuous seam welding can be done through ultrasonic welding. The maximum thickness that can be achieved varies depending on the metal. The maximum thickness can be that can be welded is 2.5mm. |
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| 6. |
What is the minimum frequency used in ultrasonic welding?(a) 10,000 Hz(b) 20,000 Hz(c) 30,000 Hz(d) 40,000 Hz |
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Answer» Right option is (b) 20,000 Hz The best explanation: The process of ultrasonic welding is mainly used for the joining of similar metals or dissimilar metals using vibration energy, by way of high frequency. The minimum frequency needed for this purpose is 20,000 Hz. |
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| 7. |
What is the maximum frequency used in ultrasonic welding?(a) 30,000 Hz(b) 40,000 Hz(c) 50,000 Hz(d) 60,000 Hz |
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Answer» Right choice is (d) 60,000 Hz To explain: None. |
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| 8. |
Which gas is used for the removal of oxygen layer formed on molten iron?(a) Hydrogen(b) Oxygen(c) Carbon dioxide(d) Chlorine |
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Answer» Right option is (b) Oxygen Best explanation: In oxygen cutting method, under considerable amount of pressure, when a jet of oxygen gas is made to blow on the particles of molten iron oxide, the oxygen layer present on the molten iron gets removed. |
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| 9. |
How much is the Brinell hardness of martensite?(a) 600-650(b) 650-700(c) 750-800(d) 800-850 |
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Answer» Right answer is (b) 650-700 Explanation: Martensite is a ferro-magnetic substance in nature, and it is known to have Brinell hardness ranging from 650-700. |
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| 10. |
What is the Brinell hardness of pearlite?(a) 150(b) 180(c) 210(d) 240 |
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Answer» The correct choice is (b) 180 The best I can explain: Pearlite is not the hardest form. The Brinell hardness of pearlite is only 180. There is a harder material than pearlite, called as martensite, which has Brinell hardness ranging from 650-700. |
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| 11. |
In Ester cured alkaline phenolic, what is used as a coreactant?(a) A phenol(b) A ketone(c) An ester(d) An aldehyde |
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Answer» Correct choice is (c) An ester The explanation: In Ester cured alkaline phenolic, there is an ester called methyl formate, which is usually used as a coreactant. |
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| 12. |
How much do the presses in press forging weigh?(a) 200-300 tonnes(b) 300-400 tonnes(c) 400-500 tonnes(d) 500-600 tonnes |
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Answer» The correct choice is (d) 500-600 tonnes Explanation: The presses used for such forging processes are manufactured for very heavy use. The presses which are generally used in press forging are of the capacity of 500 to 600 tonnes. |
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| 13. |
Hot isostatic pressing is not a viable option if the chief criterion is (a) strength without grain growth (b) lost cost (c) zero porosity (d) processing refractory ceramics |
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Answer» (b) lost cost |
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| 14. |
Which of the following is not valid for rocking furnace operation?(a) Causes overheating(b) Uniform composition of melt(c) Damage to the refractory lining(d) Fast melting |
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Answer» Right choice is (a) Causes overheating To explain: In an indirect electric arc furnace, the rocking of furnace causes the melting to speed up, it also causes uniform composition of melt and does some damage to the refractory lining. This process does not cause overheating, instead it avoids it. |
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| 15. |
In through-transmission method, which defect does the following amplitude-time graph represent?(a) No defect(b) Small defect(c) Mediocre defect(d) Large defect |
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Answer» Right option is (a) No defect For explanation I would say: None. |
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| 16. |
Which of the following components is mainly manufactured by performing metal forging?(a) Piston(b) Engine block(c) Connecting rod(d) Crankcase |
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Answer» Correct choice is (c) Connecting rod The explanation: Connecting rod is mainly manufactured by forging operation which is specifically known as hot forging process, while parts like piston, crankcase and engine blocks are manufactured by a casting process. In the forging process, a hammer is used which strikes on the heated metallic part to get into the desired shape. |
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| 17. |
Which of the following factors keeps the liquid metal level below the pouring sprout?(a) Angle of rocking furnace(b) Velocity of rocking furnace(c) Mounting distance(d) Temperature of the metal |
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Answer» Correct option is (a) Angle of rocking furnace To explain I would say: In the operation of indirect electric arc furnace, the liquid metal level has to be kept below the pouring sprout level. To accomplish this, the angle of rocking adjusts itself in different manners and maintains the liquid level. |
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| 18. |
In what conditions are the parts kept before welding in ultrasonic welding method?(a) Low static pressure(b) High static pressure(c) Low moving pressure(d) High moving pressure |
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Answer» The correct choice is (a) Low static pressure To elaborate: In ultrasonic welding method, the parts which are to be joined, are kept clamping to one another in between of supporting member and the welding tip. This clamping is done at a low static pressure. |
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| 19. |
What is hearth in a furnace?(a) The electrodes are often called hearth(b) The walls of the furnace(c) The bowl shaped bottom of the furnace(d) The dome shaped roof of the furnace |
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Answer» Correct option is (c) The bowl shaped bottom of the furnace The best explanation: The hearth is that bowl shaped bottom of the furnace. It is made up of a high refractory material (bricked and granular). |
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| 20. |
For how much time is the cupola fired before pouring?(a) 2 hours(b) 3 hours(c) 4 hours(d) 5 hours |
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Answer» The correct choice is (b) 3 hours Explanation: The process of lighting is starting the cupola and firing it for about 3 hours, a little before the metal is needed for pouring. |
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| 21. |
How much is the Brinell hardness of sorbite?(a) 250(b) 350(c) 450(d) 550 |
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Answer» Right answer is (b) 350 Explanation: The cementite in sorbite is known to be very finely divided. The material sorbite is not one of the hardest materials known in casting. The Brinell hardness of sorbite is 350. |
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| 22. |
Which of the following furnaces is not the type of crucible furnace?(a) Pit furnace(b) Pot furnace(c) Oil fired tilting furnace(d) Stack furnace |
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Answer» Right option is (d) Stack furnace For explanation I would say: Pit furnace, pot furnace and oil fired tilting furnace are the types of crucible furnace, but stack furnace is different furnace which is a modified reverberatory furnace where its efficiency is improved by better sealing of the furnace and flue gases are mainly used for preheating the charge materials. |
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| 23. |
Which of the following does not hold valid for an isostatic press?(a) Consistent mixture(b) High pressure operation(c) High density of product(d) Wet mix used |
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Answer» Correct answer is (d) Wet mix used The explanation is: An isostatic press is considered to be one of the most advanced methods of making a crucible. The entire operation is at high pressure conditions. The mixture used is consistent, because of which the product formed has high density. But the mixture that is taken, is completely dry. |
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| 24. |
What is mixed with calcium hydroxide on sand for CO2 cured polyacrylate?(a) Sodium polyacrylate(b) Calcium polyacrylate(c) Aluminium polyacrylate(d) Iron polyacrylate |
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Answer» Right answer is (a) Sodium polyacrylate Explanation: According to the reaction, sodium polyacrylate is mixed with calcium hydroxide (CaOH2) on sand and is later cured with carbon dioxide gas. |
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| 25. |
Cast iron castings cannot be produced by melting which of the following materials?(a) Pig iron(b) Steel scrap(c) Iron(d) Copper |
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Answer» Right option is (d) Copper The explanation: Cast iron castings can be produced by melting of pig iron, steel scrap, foundry returns such as risers or gates and iron contained alloys, but not copper. |
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| 26. |
In the given figure, Epoxy-acrylate has what kind of a performance in transverse strength?(a) Good performance(b) Moderate performance(c) Poor performance(d) Did not perform |
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Answer» The correct answer is (a) Good performance To explain: In the given figure, epoxy-acrylate has shown a decently good performance in transverse strength. For epoxy acrylate, one may look at the second column. |
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| 27. |
Which of the following tool is not used for clamping purpose?(a) C-clamp(b) Trammels(c) Bar clamp(d) Hand Vice |
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Answer» The correct option is (b) Trammels Easy explanation: A trammel is a measuring, marking and layout tool. While C-clamp, bar clamp, and hand vice are tools which are used for clamping process. |
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| 28. |
Which of the following can be a wavelength of gamma ray?(a) 2 x 10^-8 cm(b) 3 x 10^-8 cm(c) 4 x 10^-8 cm(d) 5 x 10^-8 cm |
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Answer» Correct option is (b) 3 x 10^-8 cm Best explanation: Gamma rays are supposedly known to have a shorter wavelength as compared to that of X-rays. The wavelength of gamma rays ranges from 0.005 x 10^-8 cm to 3 x 10^-8 cm. |
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| 29. |
Which of the following is not a source of production for gamma rays?(a) Cobalt-60(b) Iridium-192(c) Caesium-167(d) Americium-241 |
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Answer» Correct choice is (d) Americium-241 Explanation: Among all the above given isotopes, a Cobalt – 60 isotope, Iridium-192 isotope and a Caesium-167 isotope are mainly used for producing gamma rays but not Americium-241 isotope, it is used for making alpha rays. |
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| 30. |
In the given figure of a rotary melting furnace, what does the question mark depict?(a) Burner(b) Exhaust box(c) Refractory lining(d) Molten metal |
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Answer» Correct answer is (c) Refractory lining Explanation: In this given figure of a rotary melting furnace, the question mark is depicting the refractory lining, which is just below the steel shell. This lining has to be renewed after a certain usage. |
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| 31. |
Which of the following processes is known for pouring of molten metal by tilting the furnace?(a) Necking(b) Drawing(c) Tapping(d) Finning |
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Answer» The correct choice is (c) Tapping Easiest explanation: The electric furnace is generally built on a tilting plane so that the molten metal can be poured into another container for transportation. The process of tilting the furnace to pour the molten metal is known as tapping. Electric arc furnaces are widely used only where there is plentiful electricity. |
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| 32. |
What is the minimum capacity of an open hearth furnace in steel foundries?(a) 5 tons(b) 4 tons(c) 6 tons(d) 3 tons |
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Answer» The correct choice is (a) 5 tons Easy explanation: Open hearth process was primarily used only for steel making, it was later brought to use in steel foundries. The minimum capacity of open hearth furnace in steel foundries is 5 tons. |
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| 33. |
What is the maximum capacity of an open hearth furnace in steel foundries?(a) 250 tons(b) 100 tons(c) 160 tons(d) 130 tons |
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Answer» The correct answer is (b) 100 tons To elaborate: None. |
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| 34. |
Which of the following is not charged in the open hearth furnace?(a) Scrap metal(b) Flux(c) Pig iron(d) White iron |
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Answer» The correct option is (d) White iron To explain: In an open hearth furnace, the scrap metal, flux and the pig iron are charged through the charging doors. But, white iron is not charged into the open hearth furnace. |
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| 35. |
In the following figure of the air furnace, what does the question mark represent?(a) Hearth(b) Sight holes(c) Bungs(d) Fire bars |
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Answer» The correct choice is (c) Bungs To explain I would say: The question mark in the picture is depicting a few bungs. These bungs insure the proper charging of the metal. The given figure is that of an air furnace or a reverberatory furnace. |
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| 36. |
Carbon pickup does not depend on which of the following factors?(a) Size of coke(b) Height of coke bed(c) Cupola temperature(d) Cupola diameter |
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Answer» Right choice is (d) Cupola diameter Easy explanation: Magnitude of carbon pickup depends on various factors such as the presence of original carbon content, size of the coke, height of the coke bed, temperature of cupola and a few more, but it does not depend on the diameter of the cupola. |
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| 37. |
In the iron-iron carbide diagram, what is the carbon percentage by weight at eutectoid point?(a) 0.8%(b) 0.18%(c) 4.3%(d) 6.67% |
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Answer» The correct option is (a) 0.8% To elaborate: None. |
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| 38. |
With an increase in the height of the specimen, what change is seen in the air pressure measurement?(a) Increases(b) Decreases(c) No change occurs(d) No relation among the two |
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Answer» The correct option is (a) Increases The best explanation: None. |
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| 39. |
What is the kind of lattice in a gamma iron?(a) Face centered cubic(b) Body centered cubic(c) Hexagonal closely packed(d) Tetragonal closely packed |
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Answer» Correct answer is (a) Face centered cubic The explanation is: The gamma form of solid state of iron, which is formed on cooling the melt, has a face centered cubic lattice structure. |
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| 40. |
How does the piston in the clamping unit move?(a) Hydraulic energy(b) Pneumatic energy(c) Heat energy(d) Suction |
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Answer» Correct choice is (a) Hydraulic energy The best explanation: There is a clamping unit employed for holding the two halves together and for the opening and closing of the mold. A moving piston is provided which operates the power press. This piston works on hydraulic energy. |
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| 41. |
In the given figure, polyacrylate – CO2 cured, has what kind of a performance in transverse strength?(a) Good performance(b) Moderate performance(c) Poor performance(d) Did not perform |
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Answer» Right answer is (c) Poor performance For explanation I would say: None. |
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| 42. |
In the given figure of a side blown converter, what does the question mark represent?(a) Shell(b) Tuyeres(c) Wind box(d) Refractory lining |
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Answer» The correct choice is (b) Tuyeres For explanation I would say: In the following figure, the question mark is representing the part called tuyeres. Tuyeres are situated at the left of the side blown converters, and air is blown through the charge from left to right. |
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| 43. |
In the given figure, phenolic urethane has what kind of a performance in transverse strength?(a) Good performance(b) Moderate performance(c) Poor performance(d) Did not perform |
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Answer» Correct choice is (a) Good performance To elaborate: In the given figure, phenolic urethane has shown a good performance in transverse strength. The first column is indicating the answer here. |
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| 44. |
Which of the following cannot be operated through cupola furnace?(a) Cast irons(b) Copper alloys(c) Bronze(d) Zinc |
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Answer» Right choice is (d) Zinc The explanation: Among the following, zinc cannot be operated through cupola furnace, whereas the irons, copper base alloys and some kinds of bronzes are operated using a cupola furnace. |
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| 45. |
The impurities are burnt from which material in an open hearth furnace to produce steel?(a) Cast iron(b) Gray iron(c) Pig iron(d) Copper |
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Answer» Right answer is (c) Pig iron The best I can explain: The materials such as high carbon content or other impurities which are present inside the pig iron are burnt in order to obtain steel. |
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| 46. |
In tem tech thermal sand reclamation system, in the infrared heating system, which material is used in the beds?(a) Copper(b) Iron(c) Silver(d) Tungsten |
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Answer» Correct option is (d) Tungsten Explanation: In tem tech thermal sand reclamation system, in the heating process by shortwave infrared emitters, tungsten elements are used. |
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| 47. |
With an increase in air pressure measurement of the specimen, what change is seen in the air pressure measurement?(a) Increases(b) Decreases(c) No change occurs(d) No relation between the two |
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Answer» Right choice is (b) Decreases The explanation is: None. |
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| 48. |
In the formation of carbon dioxide, what should the temperature of coke be?(a) 55°F(b) 60°F(c) 65°F(d) 70°F |
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Answer» Correct choice is (b) 60°F To explain: Among exothermic reactions, the production of carbon dioxide is one of the reactions. In this reaction, coke is used as a source of carbon. The temperature of coke should be 60°F. |
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| 49. |
How is the die used in injection molding cooled?(a) Oil(b) Air(c) Water(d) Contact with cold surface |
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Answer» Correct choice is (c) Water To explain: When it comes to molding of polymers in thermoplastics, injection molding process is the most common of the methods. In this method, whenever the die has to be cooled, there is water used to cool it. |
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| 50. |
Which of the following material is not made by injection molding?(a) Nuts(b) Tubes(c) Car handles(d) Electrical fittings |
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Answer» Correct option is (b) Tubes Easiest explanation: Injection molding is one of the most widely used method of molding among molding with polymers. There are various applications of this method such as nuts, bolts, cups, car handles, electrical fitting parts, but not tubes and rods. |
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