1000+ Manufacturing & Production Engineering MCQ for JEE Main [Solved]

1. In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become
A. Half
B. Two times
C. Eight times
D. Sixteen times
Answer : D

2. A tool used to withdraw a drill from the sleeve is called
A. Drill remover
B. Drill puller
C. Drift
D. Drill drawer
Answer : C

3. The capacity of a material to be welded under the imposed fabrication conditions into a specific, suitably designed structure and to perform satisfactorily in the intended service is known as?
A. Weldment
B. Weld tab
C. Weldability
D. Tack weld
Answer : C

4. 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

5. EDM machining is applied for
A. Shaping carbide dies and punches having complicated profiles
B. Making large number of small holes in sieves and fuel nozzles
C. Embossing and engraving on harder materials
D. All of these
Answer : D

6. The point angle of a drill, for drilling stainless steel, is
A. 90°
B. 118°
C. 135°
D. 150°
Answer : C

7. 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

8. Trepanning is an operation of
A. Making a cone-shaped enlargement of the end of a hole
B. Smoothing and squaring the surface around a hole
C. Sizing and finishing a small diameter hole
D. Producing a hole by removing metal along the circumference of a hollow cutting tool
Answer : D

9. An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as
A. Counter-boring
B. Grooving
C. Knurling
D. Facing
Answer : C

10. In hot machining, tool is made of
A. Tungsten carbide
B. Brass or copper
C. Diamond
D. Stainless steel
Answer : A

11. 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

12. Surface grinding is done to produce
A. Tapered surface
B. Flat surface
C. Internal cylindrical holes
D. All of these
Answer : B

13. The operation in which oil is permeated into the pores of a powder metallurgy product is known as
A. Mixing
B. Sintering
C. Impregnation
D. Infiltration
Answer : C

14. The velocity of tool along the tool face is known as
A. Shear velocity
B. Chip velocity
C. Cutting velocity
D. Mean velocity
Answer : B

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

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

17. The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.
A. Equal to
B. Smaller than
C. Greater than
D. None of these
Answer : B

18. Crater wear is mainly due to the phenomenon known as
A. Adhesion of metals
B. Oxidation of metals
C. Diffusion of metals
D. All of these
Answer : C

19. 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

20. 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

21. The abrasive recommended for grinding materials of low tensile strength is
A. Silicon carbide
B. Aluminium oxide
C. Sand stone
D. Diamond
Answer : A

22. 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

23. The machining of titanium is difficult due to
A. High thermal conductivity of titanium
B. Chemical reaction between tool and work
C. Low tool-chip contact area
D. None of these
Answer : C

24. 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

25. Jigs are used
A. For holding and guiding the tool in drilling, reaming or tapping operations
B. For holding the work in milling, grinding, planing or turning operations
C. To check the accuracy of workpiece
D. None of the above
Answer : A

26. 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

27. 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

28. The grade of grinding wheel depends upon
A. Hardness of the material being ground
B. Speed of wheel and work
C. Condition of grinding machine
D. All of these
Answer : D

29. A __________ grinding wheel is used to grind soft materials.
A. Course grained
B. Medium grained
C. Fine grained
D. None of these
Answer : A

30. It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be
A. 10 r.p.m.
B. 20 r.p.m.
C. 120 r.p.m.
D. 180 r.p.m.
Answer : B

31. In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to
A. Circular interpolation in counter clockwise direction and incremental dimension
B. Circular interpolation in counter clockwise direction and absolute dimension
C. Circular interpolation in clockwise direction and incremental dimension
D. Circular interpolation in clockwise direction and absolute dimension
Answer : C

32. 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

33. It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?
A. Sensitive drilling machine
B. Radial drilling machine
C. Gang drilling machine
D. Multiple spindle drilling machine
Answer : C

34. 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

35. 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

36. Glazing in grinding wheels takes place when the
A. Wheel is too hard or wheel revolves at a very high speed
B. Wheel is too soft or wheel revolves at a very slow speed
C. Wheel is too hard and wheel revolves at very slow speed
D. Wheel is too soft and wheel revolves at a very high speed
Answer : A

37. Quality screw threads are produced by
A. Thread milling
B. Thread chasing
C. Thread cutting with single point tool
D. Thread casting
Answer : D

38. In which of the following milling machine, the table can be tilted in a vertical plane by providing a swivel arrangement at the knee?
A. Universal milling machine
B. Plain milling machine
C. Universal milling machine
D. Hand milling machine
Answer : C

39. 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

40. The broaching operation in which either the work or the tool moves across the other, is known as
A. Pull broaching
B. Push broaching
C. Surface broaching
D. Continuous broaching
Answer : C

41. If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as
A. ARC
B. Short ARC
C. ARC length
D. ARC blow
Answer : B

42. Threading is an operation of
A. Smoothing and squaring the surface around a hole
B. Sizing and finishing a small diameter hole
C. Producing a hole by removing metal along the circumference of a hollow cutting tool
D. Cutting helical grooves on the external cylindrical surface
Answer : D

43. What is the welding defect caused due to improper control and poor removal of slog between passes called?
A. Mismatch
B. Under fill
C. Crack
D. Porosity
Answer : B

44. In order to obtain a surface finish in the range of 0.75 ?m to 1.25 ?m , the operation used is called.
A. Grinding
B. Lapping
C. Honing
D. Buffing
Answer : A

45. 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

46. In metal cutting operations, the shear angle is the angle made by the shear plane with the
A. Direction of the tool axis
B. Direction of tool travel
C. Perpendicular to the direction of the tool axis
D. Central plane of the workpiece
Answer : B

47. 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

48. Which of the following statement is correct regarding grinding of high carbon steel?
A. Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
B. Aluminium oxide wheels are employed.
C. The grinding wheel has to be of open structure.
D. All of the above
Answer : D

49. 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

50. A lead-screw with half nuts in a lathe, free to rotate in both directions has
A. V-threads
B. Whitworth threads
C. Buttress threads
D. Acme threads
Answer : D