Manufacturing & Production Engineering 1000+ MCQ with answer for GATE

1. In drilling operation, the metal is removed by
A. Shearing
B. Extrusion
C. Shearing and extrusion
D. Shearing and compression
Answer : C

2. A grinding wheel becomes glazed (i.e. cutting edge takes a glasslike appearance) due to
A. Wear of bond
B. Breaking of abrasive grains
C. Wear of abrasive grains
D. Cracks on grinding wheel
Answer : C

3. The hardness of a grinding wheel is specified by
A. Brinell hardness number
B. Rockwell hardness number
C. Vickers pyramid number
D. Letter of alphabet
Answer : D

4. In determining the various forces on the chip, Merchant assumed that the
A. Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
B. Only continuous chip without built-up-edge is produced
C. Cutting velocity remains constant
D. All of the above
Answer : D

5. In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called
A. Friction zone
B. Work-tool contact zone
C. Shear zone
D. None of these
Answer : C

6. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as _______ double cover butt joint.
A. Single riveted
B. Double riveted
C. Both (A) and (B)
D. None of these
Answer : B

7. The depth of cut in drilling is __________ the drill diameter.
A. Equal to
B. One-fourth
C. One-half
D. Double
Answer : C

8. The cutting speed for counter-boring should be _________ that of drilling operation.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C

9. In oblique cutting system, the maximum chip thickness
A. Occurs at the middle
B. May not occur at the middle
C. Depends upon the material of the tool
D. Depends upon the geometry of the tool
Answer : B

10. The chuck preferred for quick setting and accurate centering of a job is
A. Four jaw independent chuck
B. Collect chuck
C. Three jaw universal chuck
D. Magnetic chuck
Answer : B

11. The increase in depth of cut and feed rate __________ surface finish.
A. Improves
B. Deteriorates
C. Does not effect
D. None of these
Answer : B

12. The in-feed grinding is used to
A. Produce tapers
B. Grind shoulders and formed surfaces
C. Grind long, slender shafts or bars
D. All of these
Answer : B

13. The process of improving the cutting action of the grinding wheel is called
A. Truing
B. Dressing
C. Facing
D. Clearing
Answer : B

14. An open structure of a grinding wheel is used for
A. Soft materials
B. Tough materials
C. Ductile materials
D. All of these
Answer : D

15. In a metal arc welding process, metal transfer across the arc may take place by a method of material transfer where the metal transfers across the arc is in larger drops. This is at the rate of 100 drops / sec or less, what is this known as
A. Globular transfer
B. Spray transfer
C. GMAW practice
D. Dip transfer
Answer : D

16. The carbide tools operating at very low cutting speeds (below 30 m/min)
A. Reduces tool life
B. Increases tool life
C. Have no effect on tool life
D. Spoils the work piece
Answer : A

17. A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron, is
A. Carburizing flame
B. Oxidizing flame
C. Oxy-acetylene flame
D. Neutral flame
Answer : D

18. The work or surface speed for cylindrical grinding varies from
A. 5 to 10 m/min
B. 10 to 20 m/min
C. 20 to 30 m/min
D. 40 to 60 m/min
Answer : C

19. The tool may fail due to
A. Cracking at the cutting edge due to thermal stresses
B. Chipping of the cutting edge
C. Plastic deformation of the cutting edge
D. All of these
Answer : D

20. High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
A. One-half
B. One-fourth
C. Double
D. Four times
Answer : C

21. Which of the following parameters influence the axial feed rate in centerless grinding?
A. Regulating wheel diameter
B. Speed of the regulating wheel
C. Angle between the axes of grinding and regulating wheels
D. All of the above
Answer : D

22. For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is
A. 5 m/min
B. 10 m/min
C. 15 m/min
D. 30 m/min
Answer : D

23. What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?
A. Porosity
B. Undercut
C. Under fill
D. Crack
Answer : B

24. The average cutting speed for turning brass with a high speed steel tool is
A. 15 to 19 m/min
B. 25 to 31 m/min
C. 60 to 90 m/min
D. 90 to 120 m/min
Answer : C

25. The addition of lead, sulphur and phosphorus to low carbon steels, help to
A. Reduce built up edge
B. Break up chips
C. Improve machinability
D. All of these
Answer : D

26. Segmental chips are formed during machining
A. Mild steel
B. Cast iron
C. High speed steel
D. High carbon steel
Answer : B

27. The cutting speed for drilling copper with high speed steel drills varies from
A. 10 to 20 m/min
B. 18 to 30 m/min
C. 24 to 45 m/min
D. 60 to 90 m/min
Answer : B

28. In metal machining, the work-tool contact zone is a zone where heat is generated due to
A. Plastic deformation of metal
B. Burnishing friction
C. Friction between the moving chip and the tool face
D. None of the above
Answer : B

29. Negative rakes are used for
A. Carbide tools
B. Heavy loads
C. Harder materials
D. All of these
Answer : D

30. A fine grained grinding wheel is used to grind
A. Hard and brittle materials
B. Soft and ductile materials
C. Hard and ductile materials
D. Soft and brittle materials
Answer : A

31. Ceramic cutting tools are
A. Made by cold pressing of aluminium oxide powder
B. Available in the form of tips
C. Brittle and have low bending strength
D. All of these
Answer : D

32. In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called
A. Friction zone
B. Work-tool contact zone
C. Shear zone
D. None of these
Answer : A

33. Carbide tipped tools usually have
A. Negative rake angle
B. Positive rake angle
C. Any rake angle
D. No rake angle
Answer : A

34. Flank wear depends upon the
A. Hardness of the work and tool material at the operating temperature
B. Amount and distribution of hard constituents in the work material
C. Degree of strain hardening in the chip
D. All of these
Answer : B

35. The binding material used in cemented carbide tools is
A. Tungsten
B. Chromium
C. Silicon
D. Cobalt
Answer : D

36. While current is shut down in the welding circuit, what kind of voltage exists between the output terminals of the welding machine?
A. GTAW
B. Open air cut voltage
C. Kerf
D. Gouging
Answer : B

37. While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is
A. Independent of index change gear ratio
B. Dependent on speed change gear ratio
C. Interrelated to index change gear ratio
D. Independent of speed and index change gear ratio
Answer : C

38. In machining metals, surface roughness is due to
A. Feed marks or ridges left by the cutting tool
B. Fragment of built-up edge on the machined surface
C. Cutting tool vibrations
D. All of these
Answer : D

39. The lathe spindles at the nose end have
A. Internal screw threads
B. External screw threads
C. No threads
D. Tapered threads
Answer : B

40. The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are
A. 1, 2, 2
B. 1, 2, 4
C. 2, 3, 4
D. 2, 4, 4
Answer : B

41. The hard grade grinding wheels are denoted by the letters
A. A to H
B. I to P
C. Q to Z
D. A to P
Answer : C

42. A dense structure of a grinding wheel is used for
A. Hard materials
B. Brittle materials
C. Finishing cuts
D. All of these
Answer : D

43. For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is
A. 10 m/min
B. 15 m/min
C. 22 m/min
D. 30 m/min
Answer : C

44. Dielectric is used in
A. Electrochemical machining
B. Ultrasonic machining
C. Electro discharge machining
D. Laser machining
Answer : C

45. The angle between the face and flank of the single point cutting tool is known as
A. Rake angle
B. Clearance angle
C. Lip angle
D. Point angle
Answer : C

46. In centreless grinding, work place centre will be
A. Above the line joining the two wheel centres
B. Below the line joining the two wheel centres
C. On the line joining the two wheel centres
D. At the intersection of the line joining the wheel centres with the work place plane
Answer : A

47. Internal or external threads of different pitches can be produced by
A. Pantograph milling machine
B. Profiling machine
C. Planetary milling machine
D. Piano miller
Answer : C

48. In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.
A. Up milling
B. Down milling
C. Face milling
D. End milling
Answer : B

49. Tool life is generally better when
A. Grain size of the metal is large
B. Grain size of the metal is small
C. Hard constituents are present in the microstructure of the tool material
D. None of the above
Answer : A

50. In oblique cutting of metals, the cutting edge of the tool is
A. Perpendicular to the workpiece
B. Perpendicular to the direction of tool travel
C. Parallel to the direction of tool travel
D. Inclined at an angle less than 90° to the direction of tool travel
Answer : D