LIC ADO - Manufacturing & Production Engineering 1000+ MCQ [Solved] PDF Download

1. When the tool moves parallel to the lathe axis, the movement is termed as
A. Cross feed
B. Angular feed
C. Longitudinal feed
D. Any one of these
Answer : C

2. Which of the following parameters govern the value of shear angle in continuous chip formation?
A. True feed
B. Chip thickness
C. Rake angle of the cutting tool
D. All of these
Answer : D

3. 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

4. The vector sum of cutting velocity and chip velocity is __________ shear velocity.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : A

5. A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is
A. 120
B. 170
C. 180
D. 240
Answer : B

6. 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

7. The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is
A. Carbide, ceramic, cermet, borazon
B. Ceramic, carbide, borazon, cermet
C. Cermet, carbide, ceramic, borazon
D. Borazon, ceramic, carbide, cermet
Answer : C

8. 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

9. Gear lapping is an operation
A. After heat treatment
B. Prior to heat treatment
C. For gear reconditioning
D. None of these
Answer : A

10. A left hand tool on a lathe cuts most efficiently when it travels
A. From left to right end of the lathe bed
B. From right to left end of the lathe bed
C. With the help of a compound slide
D. Across the bed
Answer : A

11. The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
A. Ceramic
B. Stellite
C. Diamond
D. Cemented carbide
Answer : B

12. Relief angles on high speed steel tools usually vary from
A. 0° to 3°
B. 3° to 10°
C. 10° to 20°
D. 20° to 30°
Answer : D

13. The cutting speed is maximum while machining __________ with a high speed steel tool.
A. Cast iron
B. Mild steel
C. Brass
D. Aluminium
Answer : D

14. Chemical milling operation is performed
A. On universal milling machine
B. On plain milling machine
C. In a tank containing an etching solution
D. Any one of these
Answer : C

15. 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

16. Continuous chips with built up edge are formed during machining of
A. Brittle metals
B. Ductile metals
C. Hard metals
D. Soft metals
Answer : B

17. Ceramic tools are fixed to tool body by
A. Soldering
B. Brazing
C. Welding
D. Clamping
Answer : B

18. The angle between the shear plane and __________ is called shear angle.
A. Work surface
B. Tool face
C. Machine surface
D. None of these
Answer : A

19. The aluminium oxide abrasive is chiefly used for grinding
A. High speed steel
B. Carbon steel
C. Wrought iron
D. All of these
Answer : D

20. Hardness of steel greatly improves with
A. Annealing
B. Cyaniding
C. Normalizing
D. Tempering
Answer : B

21. The facing is an operation of
A. Bevelling the extreme end of a workpiece
B. Embossing a diamond shaped pattern on the surface of a workpiece
C. Reducing the diameter of a workpiece over a very narrow surface
D. Machining the ends of a workpiece to produce a flat surface square with the axis
Answer : D

22. In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
A. Increases continuously
B. Decreases continuously
C. Decreases, becomes stable and then increases.
D. Increases, becomes stable and then decreases.
Answer : D

23. The taper on the lathe spindle is
A. 1 in 10
B. 1 in 15
C. 1 in 20
D. 1 in 30
Answer : C

24. Ultrasonic machining is best suited for
A. Tool steels
B. Sintered carbides
C. Glass
D. All of these
Answer : D

25. 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

26. The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : A

27. In centre less grinders, the maximum angular adjustment of the regulating wheel is
A. 5°
B. 10°
C. 15°
D. 20°
Answer : B

28. The material property which depends only on the basic crystal structure is
A. Fatigue strength
B. Work hardening
C. Fracture strength
D. Elastic constant
Answer : C

29. A taper tap has
A. Its end tapered for about three or four threads
B. Its end tapered for about eight or ten threads
C. Full threads for the whole of its length
D. None of the above
Answer : B

30. The usual value of the point angle of a drill is
A. 70°
B. 100°
C. 118°
D. 130°
Answer : C

31. When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as
A. Electrochemical machining
B. Electro-discharge machining
C. Ultrasonic machining
D. None of these
Answer : B

32. Which of the following statement is wrong?
A. The diamond is the hardest tool material and can run at cutting speeds about 50 times that of high speed steel tool.
B. The ceramic tools can be used at cutting speeds 40 times that of high speed steel tools.
C. The cemented carbide tools can be used at cutting speeds 10 times that of high speed steel tools.
D. The ceramic tools can withstand temperature upto 600°C only.
Answer : D

33. Which of the following arc welding processes does not use consumable electrodes?
A. GMAW
B. GTAW
C. Submerged Arc Welding
D. None of these
Answer : B

34. In an interchangeable assembly, shafts of size 25.000 -0.0100?????? mm mate with holes of size 25.000 -0.010????²? mm. The maximum possible clearance in the assembly will be
A. 10 microns
B. 20 microns
C. 30 microns
D. 60 microns
Answer : C

35. Side rake angle of a single point cutting tool is the angle
A. By which the face of the tool is inclined towards back
B. By which the face of the tool is inclined sideways
C. Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of the tool
D. Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
Answer : B

36. The abrasive slurry used in ultrasonic machining contains fine particles of
A. Aluminium oxide
B. Boron carbide
C. Silicon carbide
D. Any one of these
Answer : D

37. Crater wear leads to
A. Increase in cutting temperature
B. Weakening of tool
C. Friction and cutting forces
D. All of these
Answer : D

38. The hardness of a grinding wheel is determined by the
A. Hardness of abrasive grains
B. Ability of the bond to retain abrasives
C. Hardness of the bond
D. Ability of the grinding wheel to penetrate the work piece
Answer : B

39. The main purpose of a boring operation, as compared to drilling, is to
A. Drill a hole
B. Finish the drilled hole
C. Correct the hole
D. Enlarge the existing hole
Answer : D

40. A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different
A. Materials
B. Types of gears
C. Number of teeth
D. Width of gears
Answer : C

41. The top and sides of the table of a shaper usually have
A. L-type slots
B. T-type slots
C. I-type slots
D. Any one of these
Answer : B

42. Any number of equal divisions can be obtained on milling machine by
A. Direct indexing
B. Simple indexing
C. Compound indexing
D. Differential indexing
Answer : B

43. The grooving is an operation of
A. Bevelling the extreme end of a workpiece
B. Embossing a diamond shaped pattern on the surface of a workpiece
C. Reducing the diameter of a workpiece over a very narrow surface
D. Enlarging the end of a hole cylindrically
Answer : C

44. Which of the following statement is wrong as regard to down milling?
A. It can not be used on old machines due to backlash between the feed screw of the table and the nut.
B. The chips are disposed off easily and do not interfere with the cutting.
C. The surface milled appears to be slightly wavy.
D. The coolant can be poured directly at the cutting zone where the cutting force is maximum.
Answer : C

45. High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.
A. 2 to 3 times lower
B. 2 to 3 times higher
C. 5 to 8 times higher
D. 8 to 20 times higher
Answer : B

46. In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called
A. Face
B. Fillet
C. Land
D. Lead
Answer : A

47. The tailstock set over required to turn a taper on the entire length of a workpiece having diameters D and d is
A. (D - d)/2L
B. (D - d)/L
C. (D - d)/2
D. D - d
Answer : C

48. 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

49. If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is
A. Conical locator
B. Cylindrical locator
C. Diamond pin locator
D. Vee locator
Answer : A

50. Trepanning is performed for
A. Finishing a drilled hole
B. Producing a large hole without drilling
C. Truing a hole for alignment
D. Enlarging a drilled hole
Answer : B