Manufacturing & Production Engineering MCQ Solved Paper for SSC CHSL

1. The tool life in case of a grinding wheel is the time
A. Between two successive regrinds of the wheel
B. Taken for the wheel to be balanced
C. Taken between two successive wheel dressings
D. Taken for a wear of 1 mm on its diameter
Answer : C

2. A fixture is defined as a device which
A. Holds and locates a workpiece and guides and controls one or more cutting tools
B. Holds and locates a workpiece during an inspection or for a manufacturing operation
C. Is used to check the accuracy of workpiece
D. All of the above
Answer : B

3. The lip angle of a single point tool is usually
A. 20° to 40°
B. 40° to 60°
C. 60° to 80°
D. None of these
Answer : C

4. The tool material, for faster machining, should have
A. Wear resistance
B. Red hardness
C. Toughness
D. All of these
Answer : D

5. A shaft has a dimension, ?9 +0.025??????, the respective values of fundamental deviation and tolerance are
A. - 0.025, ±0.008
B. - 0.025, 0.016
C. - 0.009, ± 0.008
D. - 0.009, 0.016
Answer : D

6. The rake angle of a single point cutting tool corresponds to _________ of a twist drill.
A. Lip clearance angle
B. Helix angle
C. Point angle
D. Chisel edge angle
Answer : B

7. The drill spindles are provided with standard taper known as
A. Morse taper
B. Seller's taper
C. Chapman taper
D. Brown and Sharpe taper
Answer : A

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

9. Broaching is applied for machining
A. Internal and external surfaces
B. Round or irregular shaped holes
C. External flat and contoured surfaces
D. All of these
Answer : D

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

11. A drill considered as a cutting tool having zero rake, is known as a
A. Flat drill
B. Straight fluted drill
C. Parallel shank twist drill
D. Tapered shank twist drill
Answer : B

12. Buffing wheels are made of
A. Softer metals
B. Cotton fabric
C. Carbon
D. Graphite
Answer : B

13. Friction at the tool-chip interface can be reduced by
A. Decreasing the rake angle
B. Increasing the depth of cut
C. Decreasing the cutting speed
D. Increasing the cutting speed
Answer : D

14. Which among the NC operations given below are continuous path operations? Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
A. AW, LC and M
B. AW, D, LC and M
C. D, LC, P and SW
D. D, LC, and SW
Answer : A

15. A grinding wheel is said to be of _________ if the abrasive grains can be easily dislodged.
A. Soft grade
B. Medium grade
C. Hard grade
D. None of these
Answer : A

16. In drilling Bakelite and fibrous plastics, the point angle of a drill is
A. 90°
B. 118°
C. 135°
D. 150°
Answer : A

17. For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
A. 50°C
B. 100°C
C. 175°C
D. 275°C
Answer : B

18. 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

19. 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

20. What is the type of welding defect caused due to poor deposition of weld rod is called?
A. Porosity
B. Undercut
C. Under fill
D. Crack
Answer : A

21. In ECM, the material removal is due to
A. Corrosion
B. Erosion
C. Fusion
D. Ion displacement
Answer : D

22. 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

23. The cutting angle of a flat drill varies from
A. 3° to 8°
B. 20° to 30°
C. 60° to 90°
D. 90° to 120°
Answer : D

24. Glazing in grinding wheels __________ cutting capacity.
A. Has no effect on
B. Increase
C. Decrease
D. None of these
Answer : C

25. Which of the following statement is wrong about ultrasonic machining?
A. It is best suited for machining hard and brittle materials
B. It cuts materials at very slow speeds
C. It removes large amount of material
D. It produces good surface finish
Answer : C

26. 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

27. The different spindle speeds on a lathe form
A. Arithmetical progression
B. Geometrical progression
C. Harmonical progression
D. Any one of these
Answer : B

28. In transverse grinding
A. The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
B. The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
C. The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
D. The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
Answer : A

29. Thread grinding requires work speed from
A. 1 to 3 m/min
B. 5 to 10 m/min
C. 10 to 14 m/min
D. 14 to 20 m/min
Answer : A

30. 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

31. Which of the following statement is wrong?
A. The larger side rake angle produces chipping.
B. The smaller rake angle produces excessive wear and deformation in tool.
C. The side cutting edge angle (less than 15°) increases tool life.
D. The increase in nose radius decreases tool life.
Answer : D

32. When the cutting edge of the tool is dull, then during machining
A. Continuous chips are formed
B. Discontinuous chips are formed
C. Continuous chips with built-up edge are formed
D. No chips are formed
Answer : C

33. The method of grinding used to produce internal cylindrical holes and tapers, is
A. Internal cylindrical grinding
B. Form grinding
C. External cylindrical grinding
D. Surface grinding
Answer : A

34. The angle between the lathe centres is
A. 30°
B. 45°
C. 60°
D. 90°
Answer : C

35. In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
A. Globular transfer
B. Spray transfer
C. GMAW practice
D. Dip transfer
Answer : C

36. The cutting fluid mostly used for machining steel is
A. Water
B. Soluble oil
C. Dry
D. Heavy oils
Answer : B

37. 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

38. The operation of making a cone-shaped enlargement of the end of a hole is known as
A. Counter-sinking
B. Counter-boring
C. Trepanning
D. Spot facing
Answer : A

39. Which type of motor is not used in axis or spindle drives of CNC machine tools?
A. Induction motor
B. DC servo motor
C. Stepper motor
D. Linear servo motor
Answer : C

40. Misrun is a casting defect which occurs due to
A. Very high pouring temperature of the metal
B. Insufficient fluidity of the molten metal
C. Absorption of gases by the liquid metal
D. Improper alignment of the mould flasks
Answer : B

41. 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

42. 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

43. The angle on which the strength of the tool depends is
A. Rake angle
B. Cutting angle
C. Clearance angle
D. Lip angle
Answer : A

44. In which of the following machine, the work is usually rotated while the drill is fed into work?
A. Sensitive drilling machine
B. Radial drilling machine
C. Gang drilling machine
D. Deep hole drilling machine
Answer : D

45. In a gating system, the ratio 1: 2: 4 represents
A. Sprue base area: runner area: ingate area
B. Pouring basin area: ingate area: runner area
C. Sprue base area: ingate area: casting area
D. Runner area: ingate area: casting area
Answer : A

46. A twist drill is specified by its
A. Shank, material and diameter
B. Shank, lip angle and size of flute
C. Material, length of body and helix angle
D. Any one of these
Answer : A

47. 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

48. The floating position of the holding fixture in a rotary transfer device is used to
A. Improve the accuracy of location
B. Reduce the tendency to over-index
C. Improve upon the acceleration and deceleration characteristics
D. Reduce the cycle time
Answer : D

49. 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

50. If a particular Fe-C alloy contains less than 0.83% carbon, it is called
A. High speed steel
B. Hypo eutectoid steel
C. Hyper eutectoid steel
D. Cast iron
Answer : B