1000+ Manufacturing & Production Engineering MCQ for DRDO [Solved]

1. 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

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

3. 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

4. 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

5. In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be
A. Doubled
B. Halved
C. Quadrupled
D. Unchanged
Answer : A

6. In the relation VTⁿ = C, the value of n for ceramic tools is
A. 0.1 to 0.2
B. 0.20 to 0.25
C. 0.25 to 0.40
D. 0.40 to 0.55
Answer : D

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

8. The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is
A. Feed rate, depth of cut, cutting speed
B. Depth of cut, cutting speed, feed rate
C. Cutting speed, feed rate, depth of cut
D. Feed rate, cutting speed, depth of cut
Answer : C

9. The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called
A. Helix or rake angle
B. Point angle
C. Chisel edge angle
D. Lip clearance angle
Answer : C

10. As the cutting speed increases, the tool cutting forces
A. Remain constant
B. Increases
C. Decreases
D. First increases and then decreases
Answer : C

11. Cold working of steel is defined as working
A. At its recrystallisation temperature
B. Above its recrystallisation temperature
C. Below its recrystallisation temperature
D. At two thirds of the melting temperature of the metal
Answer : C

12. Which of the following engineering materials is the most suitable candidate for hot chamber die casting?
A. Low carbon steel
B. Titanium
C. Copper
D. Tin
Answer : D

13. In centreless grinding, the surface speed of regulating wheel is
A. 5 to 15 m/min
B. 15 to 60 m/min
C. 60 to 90 m/min
D. 90 to 120 m/min
Answer : B

14. A push broach as compared to pull broach
A. Has less number of teeth
B. Is short and stocky
C. Removes less material for each pass of the tool
D. All of the above
Answer : D

15. A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.
A. Soft grade
B. Medium grade
C. Hard grade
D. None of these
Answer : C

16. Green sand mould indicates that
A. Polymeric mould has been cured
B. Mould has been totally dried
C. Mould is green in colour
D. Mould contains moisture
Answer : D

17. In gear hobbing
A. Only hob rotates
B. Only gear blank rotates
C. Both hob and gear blank rotates
D. Neither hob nor gear blank rotates
Answer : C

18. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is
A. 1.02
B. 1.32
C. 1.66
D. 1.82
Answer : B

19. Discontinuous chips are formed during machining of
A. Brittle metals
B. Ductile metals
C. Hard metals
D. Soft metals
Answer : A

20. 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

21. In the relation VTⁿ = C, the value of n for carbide tools is
A. 0.1 to 0.2
B. 0.20 to 0.25
C. 0.25 to 0.40
D. 0.40 to 0.55
Answer : B

22. A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
A. 0.2 mm
B. 10 mm
C. 20 mm
D. 100 mm
Answer : C

23. The cutting force in punching and blanking operations mainly depends on
A. The modulus of elasticity of metal
B. The shear strength of metal
C. The bulk modulus of metal
D. The yield strength of metal
Answer : B

24. Hardness of green sand mould increases with
A. Increase in moisture content beyond 6 percent
B. Increase in permeability
C. Decrease in permeability
D. Increase in both moisture content and permeability
Answer : C

25. 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

26. 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

27. 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

28. The example of snag grinding is
A. Trimming the surface left by sprues and risers on castings
B. Grinding the parting line left on castings
C. Removing flash on forgings
D. All of these
Answer : D

29. 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

30. The broaching operation in which the work moves past the stationary tool is called
A. Pull broaching
B. Push broaching
C. Surface broaching
D. Continuous broaching
Answer : D

31. The grinding wheel speed (surface speed in m/min) usually varies from
A. 500 to 1000
B. 1000 to 1500
C. 1500 to 2000
D. 2000 to 2500
Answer : C

32. In electro discharge machining, tool is made of
A. Brass
B. Copper
C. Copper tungsten alloy
D. All of these
Answer : D

33. The tool life is affected by
A. Depth of cut
B. Cutting speed
C. Feed
D. All of these
Answer : D

34. 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

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

36. Two plates of the same metal having equal thickness are to be butt welded with electric arc. When the plate thickness changes, welding is achieved by
A. Adjusting the current
B. Adjusting the duration of current
C. Changing the electrode size
D. Changing the electrode coating
Answer : C

37. In a plain milling machine, the table can be moved
A. Longitudinally
B. Crosswise
C. Vertically
D. All of these
Answer : D

38. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is
A. 0.20
B. 0.30
C. 0.50
D. 0.60
Answer : C

39. The surface finish is improved by the increase in
A. Cutting speed
B. Nose radius
C. True rake angle
D. All of these
Answer : D

40. A process of removing metal by pushing or pulling a cutting tool is called
A. Up milling
B. Down milling
C. Forming
D. Broaching
Answer : D

41. The percentage of carbon in gray cast iron is in the range of
A. 0.25 to 0.75 percent
B. 1.25 to 1.75 percent
C. 3 to 4 percent
D. 8 to 10 percent
Answer : C

42. In plunge 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 : B

43. A right 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 : B

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

45. Which one of the following is a solid state joining process?
A. Gas tungsten arc welding
B. Resistance spot welding
C. Friction welding
D. Submerged arc welding
Answer : C

46. In a shaper, the metal is removed during
A. Forward stroke
B. Return stroke
C. Both the forward and return strokes
D. Neither the forward nor the return stroke
Answer : A

47. Calculate the weld per minute, work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles on and 2 cycles off Power supply is at 50 Hz.
A. 3000 welds / min, 75 mm / min
B. 600 welds / min, 1500 mm / min
C. 500 welds/ min, 1250 mm/min
D. 22 welds / min, 55 mm / min
Answer : B

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

49. 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

50. 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