1000+ Manufacturing & Production Engineering MCQ for UPSC CDS [Solved]

1. 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

2. The usual value of the helix angle of a drill is
A. 20°
B. 30°
C. 45°
D. 60°
Answer : B

3. 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

4. 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

5. The cutting fluid mostly used for machining alloy steels is
A. Water
B. Soluble oil
C. Dry
D. Sulphurised mineral oil
Answer : D

6. 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

7. 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

8. 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

9. A coarse 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 : B

10. For turning small taper on long workpiece, the suitable method is
A. By a form tool
B. By setting over the tail stock
C. By a taper turning attachment
D. By swivelling the compound rest
Answer : B

11. The angle between the face and flank of the single point cutting tool is known as
A. Rake angle
B. Clearance angle
C. Lip angle
D. Point angle
Answer : C

12. 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

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

14. The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon
A. Work material
B. Tool material
C. Working conditions
D. Type of chip produced
Answer : B

15. In metal machining, the work-tool contact zone is a zone where heat is generated due to
A. Plastic deformation of metal
B. Burnishing friction
C. Friction between the moving chip and the tool face
D. None of the above
Answer : B

16. 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

17. 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

18. Cast iron during machining produces
A. Continuous chips
B. Discontinuous chips
C. Continuous chips with built-up edge
D. None of these
Answer : B

19. 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

20. 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

21. The type of reamer used for reaming soft aluminium or copper, is
A. Straight fluted reamer
B. Left hand spiral fluted reamer
C. Right hand spiral fluted reamer
D. Any one of these
Answer : B

22. The hard grade grinding wheels are denoted by the letters
A. A to H
B. I to P
C. Q to Z
D. A to P
Answer : C

23. The primary purpose of a sprue in a castig 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

24. 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

25. In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as
A. Side relief angle
B. End relief angle
C. Back rake angle
D. Side rake angle
Answer : B

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

27. If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is
A. Conical locator
B. Cylindrical locator
C. Diamond pin locator
D. Vee locator
Answer : A

28. For fast removal of materials during grinding, a _________ grinding wheel is used.
A. Course grained
B. Fine grained
C. Medium grained
D. None of these
Answer : A

29. Which of the following operation is first performed?
A. Spot facing
B. Boring
C. Tapping
D. Drilling
Answer : B

30. A hole is of dimension ? = 9 ?0????¹? mm. The corresponding shaft is of dimension ? = 9 ?0.001????¹? mm. The resulting assembly has
A. Loose running fit
B. Close running fit
C. Transition fit
D. Interference fit
Answer : C

31. The operation of machining several surfaces of a workpiece simultaneously is called
A. Profile milling
B. Gang milling
C. Saw milling
D. Helical milling
Answer : B

32. A drill mainly used in drilling brass, copper or softer materials, is
A. Flat drill
B. Straight fluted drill
C. Parallel shank twist drill
D. Tapered shank twist drill
Answer : B

33. 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

34. Which of the following process is used for preparing parts having large curved surfaces and thin sections?
A. Hot machining
B. Ultrasonic machining
C. ECM process
D. Chemical milling
Answer : D

35. Small nose radius
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 : D

36. 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

37. The rake angle required to machine brass by high speed steel tool is
A. 0°
B. 10°
C. 20°
D. 100°
Answer : A

38. Which of the following statement is wrong as regard to down milling?
A. It can not be used on old machines due to backlash between the feed screw of the table and the nut.
B. The chips are disposed off easily and do not interfere with the cutting.
C. The surface milled appears to be slightly wavy.
D. The coolant can be poured directly at the cutting zone where the cutting force is maximum.
Answer : C

39. 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

40. 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

41. 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

42. The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called
A. Truing
B. Dressing
C. Facing
D. Clearing
Answer : A

43. 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

44. If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?
A. Forehand welding
B. Flux cored ARC welding
C. Electro slag welding
D. Pulsed spray welding
Answer : A

45. The purpose of jigs and fixtures is to
A. Increase machining accuracy
B. Facilitate interchangeability
C. Decrease expenditure on quality control
D. All of these
Answer : D

46. 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

47. 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

48. 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

49. The operation performed on a shaper is
A. Machining horizontal surface
B. Machining vertical surface
C. Machining angular surface
D. All of these
Answer : D

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