Manufacturing & Production Engineering 1000+ MCQ with answer for RRB NTPC

1. 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

2. The factor considered for evaluation of machinability is
A. Cutting forces and power consumption
B. Tool life
C. Type of chips and shear angle
D. All of these
Answer : D

3. 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

4. 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

5. 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

6. 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

7. A mandrel is used to hold
A. An eccentric work
B. A heavy work
C. A thin work
D. None of these
Answer : D

8. 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

9. Grinding wheels should be tested for balance
A. Only at the time of manufacture
B. Before starting the grinding operation
C. At the end of grinding operation
D. Occasionally
Answer : D

10. 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

11. The cutting force in up milling __________ per tooth movement of the cutter.
A. Is zero
B. Is maximum
C. Decreases from maximum to zero
D. Increases from zero to maximum
Answer : D

12. 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

13. Climb milling is chosen while machining because
A. The chip thickness increase gradually
B. It enables the cutter to dig in and start the cut
C. The specific power consumption is reduced
D. Better surface finish can be obtained
Answer : B

14. 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

15. 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

16. 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

17. Side relief angle of a single point 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 tool
D. Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
Answer : C

18. In order to have interference fit, it is essential that the lower limit of the shaft should be
A. Greater than the upper limit of the hole
B. Lesser than the upper limit of the hole
C. Greater than the lower limit of the hole
D. Lesser than the lower limit of the hole
Answer : A

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

20. The effect of setting a boring tool above centre height leads to
A. Increase in the effective rake angle and a decrease in the effective clearance angle
B. Increase in both effective rake angle and effective clearance angle
C. Decrease in the effective rake angle and an increase in the effective clearance angle
D. Decrease in both effective rake angle and effective clearance angle
Answer : A

21. In Oxyacetylene gas welding, temperature at the inner cone of the flame is around
A. 3500?C
B. 3200?C
C. 2900?C
D. 2550?C
Answer : B

22. 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

23. 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

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

25. 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

26. The cutting speed is minimum while machining _________ with a high speed steel tool.
A. Cast iron
B. Mild steel
C. Brass
D. Aluminium
Answer : A

27. Hot rolling of mild steel is carried out
A. At recrystallization temperature
B. Between 100?C to 150?C
C. Between recrystallization temperature
D. Above recrystallization temperature
Answer : D

28. The grinding operation is a
A. Shaping operation
B. Forming operation
C. Surface finishing operation
D. Dressing operation
Answer : C

29. 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

30. What is the type of welding defect caused due to shrinkage during solidification and by weld stresses called?
A. Incomplete fusion
B. Lamellar tearing
C. Mismatch
D. Shrinkage void
Answer : B

31. Crater wear is predominant in
A. Carbon tool steels
B. Tungsten carbide tools
C. High speed steel tools
D. Ceramic tools
Answer : B

32. In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.
A. Cross direction only
B. Longitudinal direction only
C. Both cross and longitudinal direction
D. Any direction
Answer : C

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

34. The method of grinding used to produce a straight or tapered surface on a workpiece, is
A. Internal cylindrical grinding
B. Form grinding
C. External cylindrical grinding
D. Surface grinding
Answer : C

35. 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

36. The factor responsible for the formation of continuous chips with built up edge is
A. Low cutting speed and large rake angle
B. Low cutting speed and small rake angle
C. High cutting speed and large rake angle
D. High cutting speed and small rake angle
Answer : B

37. In a particular type of welding, flux is prepared in the form of a coarse powder and granulated flux is spread over the joint. What is this type of welding process called?
A. Electric arc welding
B. Submerged arc welding
C. MIG welding
D. TIG welding
Answer : B

38. 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

39. 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

40. The primary purpose of a sprue in a casting mould is to
A. Feed the casting at a rate consistent with the rate of solidification.
B. Act as a reservoir for molten metal
C. Feed molten metal from the pouring basin to the gate
D. Help feed the casting until all solidification takes place
Answer : C

41. The crystal structure of austenite is
A. Body centred cubic
B. Base centred cubic
C. Hexagonal closed packed
D. Body centred tetragonal
Answer : B

42. 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

43. Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 ?m and current flow time of 0.2 second, heat generated during the process will be
A. 0.2 Joule
B. 1 Joule
C. 5 Joule
D. 1000 Joule
Answer : D

44. Soft materials can not be economically ground due to
A. High temperature involved
B. Frequent wheel clogging
C. Rapid wheel wear
D. Low work piece stiffness
Answer : B

45. In ultrasonic machining, the metal is removed by
A. Using abrasive slurry between the tool and work
B. Direct contact of tool with the work
C. Maintaining an electrolyte between the work and tool in a very small gap between the two
D. Erosion caused by rapidly recurring spark discharges between the tool and work
Answer : A

46. 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

47. In drilling softer materials, the cutting speed is _________ as compared to harder materials.
A. Same
B. Low
C. High
D. None of these
Answer : C

48. Down milling is also called
A. Conventional milling
B. Climb milling
C. End milling
D. Face milling
Answer : B

49. The average cutting speed for turning mild steel 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 : B

50. In which of the following machine, the work rotates and the tool is stationary?
A. Vertical boring machine
B. Horizontal boring machine
C. Precision boring machine
D. Jig boring machine
Answer : A