RRB ALP - Manufacturing & Production Engineering 1000+ MCQ [Solved] PDF Download

1. 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

2. 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

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

4. 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

5. The mechanism of material removal in EDM process is
A. Melting and Evaporation
B. Melting and Corrosion
C. Erosion and Cavitations
D. Cavitations and Evaporation
Answer : A

6. The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and ? = Angle of inclination of wheel)
A. ?d
B. ?dn
C. ?dn sin?
D. ?dn cos?
Answer : C

7. 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

8. 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

9. 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

10. The saw milling is an operation of
A. Producing grooves around the periphery of a cylindrical or conical workpiece
B. Producing narrow slots or grooves on a workpiece
C. Reproduction of an outline of a template on a workpiece
D. Machining several surfaces of a workpiece simultaneously
Answer : B

11. 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

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

13. The type of reamer used for reaming operation in a blind hole, is
A. Straight fluted reamer
B. Left hand spiral fluted reamer
C. Right hand spiral fluted reamer
D. Any one of these
Answer : C

14. 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

15. 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

16. 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

17. 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

18. In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.
A. Up milling
B. Down milling
C. Face milling
D. End milling
Answer : B

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

20. A single point tool has
A. Rake angle
B. Cutting angle
C. Lip angle
D. All of these
Answer : D

21. 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

22. In machining metal, cutting force at the cutting edge is measured by a
A. Wattmeter
B. Dynamometer
C. Hydrometer
D. Pyrometer
Answer : B

23. Larger than 15° side cutting edge angle
A. Increases tool life
B. Decreases tool life
C. Produces chipping and decreases tool life
D. Results in excessive stress concentration and greater heat generation
Answer : C

24. The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe.
A. Equal to
B. Twice
C. Thrice
D. One-half
Answer : B

25. The chamfering 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 : A

26. The thrust force will increase with the increase in
A. Side cutting edge angle
B. Tool nose radius
C. Rake angle
D. End cutting edge angle
Answer : A

27. For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is
A. 10 m/min
B. 15 m/min
C. 22 m/min
D. 30 m/min
Answer : C

28. 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

29. 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

30. The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called
A. Up milling
B. Down milling
C. Face milling
D. End milling
Answer : B

31. The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.
A. Mild steel
B. Copper
C. Aluminium
D. Brass
Answer : A

32. 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

33. 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

34. 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

35. 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

36. In down milling, the thickness of chip is
A. Minimum at the beginning of the cut and maximum at the end of the cut
B. Maximum at the beginning of the cut and minimum at the end of the cut
C. Uniform throughout the cut
D. None of these
Answer : B

37. 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

38. The height of each tooth of a broach is
A. Same throughout
B. In progressively decreasing order
C. In progressively increasing order
D. None of these
Answer : C

39. A lathe with four steps on the cone pulley and with back-gears will have
A. Four direct speeds
B. Four indirect speeds
C. Four direct and four indirect speeds
D. Eight indirect speeds
Answer : C

40. 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

41. 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

42. 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

43. The main purpose of spheroidising treatment is to improve
A. Hardenability of low carbon steels
B. Machinability of low carbon steels
C. Hardenability of high carbon steels
D. Machinability of high carbon steels
strong>Answer : D

44. When the shear angle is small
A. Path of shear is short and chip is thin
B. Path of shear is large and chip is thick
C. Path of shear is short and chip is thick
D. Path of shear is large and chip is thin
Answer : B

45. Crater wear occurs mainly on the
A. Nose part, front relief face and side relief face of the cutting tool
B. Face of the cutting tool at a short distance from the cutting edge only
C. Cutting edge only
D. Front face only
Answer : B

46. 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

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

48. Which of the following statement is correct in regard to centreless grinding?
A. The workpiece is supported throughout its entire length as grinding takes place.
B. It is a continuous process and adopted for production work.
C. It requires no holding device for the work.
D. All of the above
Answer : D

49. In drilling brass, a drill with
A. Zero helix angle is used
B. Low helix angle is used
C. High helix angle is used
D. Any helix angle can be used
Answer : B

50. The cutting speed for drilling copper with high speed steel drills varies from
A. 10 to 20 m/min
B. 18 to 30 m/min
C. 24 to 45 m/min
D. 60 to 90 m/min
Answer : B