SSC JE Exam - foundry casting methods defects forging extrusion metal cutting principles cutting tools machining lathe milling drilling shaping grinding manufacturing processes Question Bank with Options

1. What is the term for the phenomenon where the cutting tool material gets welded to the workpiece material during machining, leading to increased friction and poor finish?

A) Crater wear

B) Flank wear

C) Built-up edge (BUE)

D) Chipping

2. Which machining process is characterized by a slow, controlled removal of material using a rotating abrasive wheel?

A) Milling

B) Grinding

C) Drilling

D) Lapping

3. What is the primary function of the 'flank' of a cutting tool?

A) To curl and break the chip

B) To provide clearance to prevent rubbing against the workpiece

C) To form the chip

D) To support the cutting edge

4. Which forging process is used to reduce the diameter of a rod or tube by rotating dies?

A) Upsetting

B) Coining

C) Roll Forging

D) Swaging

5. What is the main advantage of using powder metallurgy in manufacturing?

A) Ability to produce very large and complex shapes

B) Cost-effective for mass production of parts with intricate details and controlled porosity

C) High tensile strength in all applications

D) Eliminates the need for heat treatment

6. What is the primary cause of 'hot tears' in castings?

A) Improper gating system design

B) Premature solidification of the casting while it is still constrained by the mold

C) Oxidation of the molten metal

D) Entrapped gases in the molten metal

7. Which manufacturing process is best suited for producing complex, thin-walled metal parts with high precision?

A) Sand Casting

B) Forging

C) Investment Casting

D) Extrusion

8. What is the term for the process of removing material from the inside diameter of a hole to enlarge it?

A) Milling

B) Turning

C) Boring

D) Reaming

9. Which type of grinding wheel is used for grinding hardened steels?

A) Silicon Carbide

B) Aluminum Oxide

C) Diamond

D) Cubic Boron Nitride

10. What is the purpose of a 'built-up edge' (BUE) in machining?

A) It improves surface finish and tool life

B) It increases cutting forces and can lead to poor surface finish

C) It is a desirable condition for all machining operations

D) It is a type of casting defect

11. Which of the following is a disadvantage of using a lathe for cutting operations?

A) Limited to producing cylindrical shapes

B) High tool wear

C) Difficulty in achieving precise dimensions

D) Requires a large amount of floor space

12. What is the main difference between milling and shaping?

A) Milling uses a rotating cutter, while shaping uses a reciprocating tool

B) Shaping produces cylindrical surfaces, while milling produces flat surfaces

C) Milling is a continuous process, while shaping is intermittent

D) Shaping requires a cutting fluid, while milling does not

13. Which machining operation is used to produce a flat surface at the end of a cylindrical workpiece?

A) Drilling

B) Turning

C) Facing

D) Boring

14. What is the primary purpose of the rake angle on a cutting tool?

A) To control the depth of cut

B) To facilitate chip curl and reduce cutting forces

C) To provide clearance between the tool and workpiece

D) To increase the tool's hardness

15. Which metal cutting principle states that the cutting speed, feed, and depth of cut are interdependent for achieving optimal tool life and surface finish?

A) Taylor's Tool Life Equation

B) Merchant's Force Circle

C) The Chip Formation Theory

D) The Machining Constant

16. What is the main advantage of cold extrusion over hot extrusion?

A) Lower forces required

B) Better surface finish and dimensional accuracy

C) Ability to work with higher melting point metals

D) Reduced strain hardening

17. Which type of extrusion is suitable for producing long, thin wires and rods?

A) Direct Extrusion

B) Indirect Extrusion

C) Impact Extrusion

D) Wire Drawing

18. What is the process of reducing the cross-sectional area of a metal bar by forcing it through a die called?

A) Rolling

B) Drawing

C) Extrusion

D) Swaging

19. In hot forging, what is the main benefit of working the metal above its recrystallization temperature?

A) Increased strength of the final product

B) Reduced ductility and increased strain hardening

C) Lower forces required and improved ductility

D) Better surface finish

20. Which casting defect is caused by the rapid vaporization of moisture in the mold cavity when molten metal is poured?

A) Blowholes

B) Scabs

C) Penetration

D) Misrun

21. What is the primary purpose of a riser in casting?

A) To feed molten metal to the casting to compensate for shrinkage

B) To allow gases to escape from the mold

C) To support the core

D) To control the flow rate of molten metal

22. Which manufacturing process involves creating a pattern of the desired part, coating it with a refractory material, and then melting the pattern away?

A) Sand Casting

B) Die Casting

C) Investment Casting

D) Centrifugal Casting

23. What is the main advantage of using ceramic cutting tools compared to high-speed steel tools?

A) Higher toughness

B) Lower cost

C) Higher hardness and ability to cut at higher speeds

D) Better resistance to thermal shock

24. Which of the following factors significantly influences tool wear?

A) Workpiece material hardness

B) Cutting speed

C) Cutting fluid

D) All of the above

25. In metal cutting, what does the term 'tool life' refer to?

A) The total time a machine tool can operate

B) The time a cutting tool can perform effectively before needing replacement or regrinding

C) The duration of a single cutting operation

D) The expected lifespan of a workpiece

26. What is the term for the unwanted material that adheres to the cutting edge of a tool during machining?

A) Chip

B) Flank wear

C) Built-up edge (BUE)

D) Crater wear

27. Which machining process is most suitable for producing very fine surface finishes and precise dimensions?

A) Milling

B) Drilling

C) Grinding

D) Turning

28. What is the primary characteristic of grinding as a machining process?

A) Removal of large amounts of material quickly

B) Use of a single-point cutting tool

C) Use of abrasive particles to remove material

D) Production of rough surfaces

29. Which of the following cutting tools has a negative rake angle?

A) High-speed steel turning tool

B) Carbide turning tool

C) HSS drill bit

D) Diamond turning tool

30. What is the main purpose of shaping in machining?

A) To produce cylindrical surfaces

B) To produce flat surfaces with reciprocating motion

C) To produce holes

D) To produce complex contours

31. Which type of lathe operation is used to reduce the diameter of a workpiece along its entire length?

A) Facing

B) Taper turning

C) Parting off

D) Turning

32. What is the primary motion in drilling?

A) Rotary motion of the workpiece

B) Linear motion of the tool

C) Rotary motion of the tool

D) Reciprocating motion of the workpiece

33. Which machining process is characterized by a rotating cutter that moves linearly to remove material?

A) Turning

B) Drilling

C) Milling

D) Grinding

34. What is the primary function of a cutting fluid in machining operations?

A) To increase friction between the tool and workpiece

B) To remove heat and lubricate the cutting zone

C) To harden the workpiece surface

D) To provide a smooth surface finish

35. Which type of chip is formed when machining brittle materials or at very high cutting speeds?

A) Continuous chip

B) Discontinuous chip

C) Built-up edge chip

D) Segmented chip

36. What is the main cutting parameter that determines the depth of material removed in a single pass during machining?

A) Cutting speed

B) Feed rate

C) Depth of cut

D) Rake angle

37. Which of the following is a primary advantage of extrusion over other metal forming processes?

A) Ability to produce very thin sheets

B) High accuracy for simple shapes

C) Production of complex cross-sections with good surface finish

D) Low energy consumption

38. What is a common defect in extruded products where the surface of the material is torn or grooved?

A) Surface folds

B) Die lines

C) Seams

D) Galloping

39. Which type of extrusion is typically used for producing hollow sections like tubes and structural shapes?

A) Direct Extrusion

B) Indirect Extrusion

C) Hydrostatic Extrusion

D) Impact Extrusion

40. In direct extrusion, the ram moves in the same direction as the extruded product. What happens in indirect extrusion?

A) The ram moves in the opposite direction of the extruded product

B) The die moves along with the workpiece

C) The ram and die move together

D) The workpiece remains stationary

41. Which metalworking process is used to shape metal by forcing it through a die of a specific cross-section?

A) Rolling

B) Drawing

C) Extrusion

D) Forging

42. What is the main advantage of closed-die forging over open-die forging?

A) Lower tooling costs

B) Greater flexibility in shape complexity

C) Higher production rates and better dimensional accuracy

D) Suitable for very large and simple shapes

43. Which forging defect is caused by metal folding over itself during the process?

A) Cracks

B) Inclusions

C) Lap

D) Scale pits

44. What is the primary purpose of upsetting in forging?

A) To increase the length of a workpiece

B) To decrease the length and increase the cross-sectional area

C) To create holes in a workpiece

D) To bend a workpiece

45. Which type of forging is performed at a temperature below the recrystallization temperature of the metal?

A) Hot forging

B) Cold forging

C) Open-die forging

D) Closed-die forging

46. In investment casting, what material is typically used for the pattern?

A) Steel

B) Aluminum

C) Wax

D) Cast Iron

47. What is the main advantage of using shell molding for casting?

A) Suitable for very large castings

B) Good dimensional accuracy and surface finish

C) Low tooling cost

D) Ability to cast refractory metals

48. Which defect in castings is characterized by the formation of a network of fine cracks on the surface?

A) Hot tears

B) Cold shuts

C) Shrinkage porosity

D) Cracks

49. What is the primary purpose of a gating system in a casting mold?

A) To provide a reservoir of molten metal

B) To control the flow of molten metal into the mold cavity

C) To allow gases to escape from the mold cavity

D) To support the core within the mold

50. Which casting method involves pouring molten metal into a mold cavity that is rotated at high speed?

A) Die Casting

B) Centrifugal Casting

C) Investment Casting

D) Sand Casting

foundry casting methods defects forging extrusion metal cutting principles cutting tools machining lathe milling drilling shaping grinding manufacturing processes - Question Bank