Dpmt Machine Shop Technology Objective questions

CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY

Question Bank

1 MARK—QUESTION

2 MARK ---QUESTION

3 MARK --- QUESTION

4/5 MARK ----QUESTION

Course : DPMT

Semester : 3

Subject : Machine Shop Technology-I

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1. In _________ the cutting edge of the tool is inclined at an acute angle with the direction of tool feed and the chip being disposed at a certain angle is

a) Orthogonal cutting

b) Oblique cutting

c) both a & b

d) None of the above

Ans: - b) Oblique cutting

2. The angle formed between the face of the tool and plane parallel to its base is

a) Lip angle

b) clearance angle

c) Rake angle

d) Cutting edge

Ans: - c) Rake angle

3. The angle between the face and the flank of the tool is known as

a) Lip angle

b) clearance angle

c) Rake angle

d) cutting edge

Ans:- a) Lip angle

4. Tool life is calculated by _________ formula

a) L = 1000 ts VT mm3 /min

b) L = 100 ts VT mm3 /min

c) L = 30 ts VT mm3 /min

d) L = 60 ts VT mm3 /min

Ans: - a) L = 1000 ts VT mm3 /min

5. The angle formed between the flank of the tool and a perpendicular line drawn from the

cutting point to the base of the tool is

a) Lip angle

b) clearance angle

c) Rake angle

d) Relief angle

Ans: - d) Relief angle

6. The cutting tool wears due to

a) Edge wear

b) crater wear

c) flank wear

d) All of the above

Ans: - d) All of the above

7. Which of the following tools are generally manufactures by powered metallurgy

a) Low carbon steel

b) Abrasives

c) High carbon steel

d) Cemented carbide

Ans: - d) cemented carbide

8. Crater wear occurs mainly due to _______________.

a) Abrasion

b) Diffusion

c) Oxidation

d) Adhesion

Ans:- b) Diffusion

9. _____________ is the time a tool can be reliably be used for cutting before it must be

discarded/ repaired

a) Tool life

b) Tool time

c) Tool loss

d) None

Ans: - a) Tool life

10. Which of the following is second hardest substance known

a) Ceramics b) cermets c) Cubic Boron Nitride d) diamond

Ans:-c) Cubic boron nitrate

11. Cutting forces or power at the cutting tool may be measured by

a) Dynamometer

b) Ammeter

c) Wattmeter

d) All of the above

Ans: - d) All of the above

12. Built up edge in cutting tools can be eliminated by

a) Fast cutting speed

b) High rake angle

c) High pressure cutting fluids

d) All of the above

Ans:- d) All of the above

13. The cutting speed of high speed steels is ________ times faster than carbon steel

a) 2

b) 4

c) 6

d) 8

Ans:- b) 4 times

14. Which of the following cutting tool has highest hot hardness

a) Ceramics

b) Cast alloy

c) High speed steel

d) Carbon tool steel

Ans: - a) ceramics

15. The relation of the cutting speed to the tool life is expressed by the

a) VT=C

b) VTn = C

c) V

n T= C

d) None of the above

Ans: - b) VTn = C

16. Horse power required in cutting is

a) Work done in cutting per minute/4500

b) Work done in cutting per minute/1000

c) Work done in cutting per hour/4500

d) None of the above

Ans:a) Work done in cutting per minute/4500

17. Which of the following materials are cutting tool materials

a) Diamond

b) Cemented carbides

c) Ceramics

d) All of the above

Ans:- d) All of the above

18. The alloying elements for HSS tools are

a) 18%W, 4%Cr and 1% V

b) 18%cr, 4%W and 1% V

c) 18%V, 4%Cr and 1% W

d) None of the above

Ans :- a) 18%W, 4%Cr and 1% V

19. ___________ alloy is added to increase wear resistance at Red Hotness

a) Tungsten

b) Cobalt

c) Molybdenum

d) Vanadium

Ans :- b) Cobalt

20. Which of the following cutting conditions greatly affects the tool wear

a) Cutting speed

b) Feed

c) Depth of cut

d) None of the above

Ans:- a) Cutting speed

21. The cutting fluids mostly used for machining alloy steel is

a) Water

b) Soluble oil

c) Dry

d) Sulphurised mineral oil

Ans:- d) sulphurised mineral oil

22. The cutting fluids mostly used for machining steel is

a) Water

b) Soluble oil

c) Dry

d) Heavy oil

Ans :- b) soluble oil

23. Functions of cutting fluids are

a) To cool the cutting tool and the work piece

b) To lubricate the chip, tool and work piece

c) To help carry away the chips

d) All of the above

Ans:- d) all of the above

24. Advantage of chemical fluids are

a) A very light residual film that is easy to remove

b) Heat dissipation is rapid

c) Good detergent properties

d) All of the above

Ans:- d) All of the above

25. The methods of application of cutting fluids are

a) Flooding

b) Jet application

c) Mist application

d) All of the above

Ans d) All of the above

26. In ________ the cutting fluids , which may be either a liquid or a gas is applied in the form of

a fire jet under pressure

a) Flooding

b) Jet application

c) Mist application

d) All of the above

Ans: - b) Jet application

27. __________ control , both direction of chip flow and the strength of the tool lip

a) Side rake angle

b) Relief angle

c) Rake angle

d) All of the above

Ans :- c) Rake angle

28. ____________ acts downwards on the tool lip

a) Cutting force

b) Radial force

c) Thrust force

d) None of the above

Ans :- a) cutting force

29. For turning small taper on long work piece the suitable method is .

a) By a form tool

b) By setting over the tail stock

c) By a taper turning attachment

d) All of the above

Ans: - d) All of the above

30. Grinding wheel is specified as “A 46 K 5 B 17 “. Grain size of wheel will be

a) Coarse

b) Medium

c) Fine

d) Very fine

Ans: - b) Medium

31. Which of the following specified grinding wheel will have Aluminum oxide abrasive

a) Z 46 K 5 B 17

b) C 600 K 5 B 17

c) C 8 K 5 B 17

d) A 80 K 5 B 17

Ans: d) A 80 K 5 B 17

32. Operation done to make periphery of grinding wheel concentric with its axis to recover its lost

shape is known as

a) Loading

b) Glazing

c) Dressing

d) Truing

Ans:- d) Truing

Course : DPMT Subject : Machine Shop Technology-I Semester : 1

Page 5 of 13

33. Removing dull grains in order to grinding wheel sharp is known as

a) Loading

b) Glazing

c) Dressing

d) Truing

Ans: - c) Dressing

Unit II

(Lathe)

34. In lathe work, when the tool is feed parallel to the rotation of job work, it will produce

a) Cylindrical surface

b) Spherical surface

c) Tapered surface

d) All of the above

Ans: d) All of the above

35. The following types of lathe is operated through cams and cam plate

a) Precision lathe

b) Crankshaft lathe

c) Screw cutting lathe

d) Duplicating lathe

Ans:- c) screw cutting lathe

36. The following part of lathe serves as housing for the driving pulleys and back gear

a) Head stock

b) Tail stock

c) Bed

d) Carriage

Ans:- a) Head stock

37. In lathe, the back gear is used for affecting_________ in spindle speed, there by facilitating

under range of speeds.

a) Increase

b) Reduction

c) Increase or reduction

d) None of the above

Ans:- b) reduction

38. The following acts as driving shaft in lathe

a) Counter shaft

b) Spindle shaft

c) Lead screw

d) None of the above

Ans:- a) counter shaft

39. A desired speed of __________ can be obtained by selecting the suitable change gears

having proper number of teeth

a) Lead screw

b) Counter shaft

c) Spindle

d) Feed gear box

Ans:-a) lead screw

40. The lathe carriage serves the following purpose of the tool

a) Guiding

b) Feeding

c) Supporting

d) All of the above

Ans:- d) all of the above

41. The following is also known as tool rest

a) Saddle

b) Cross slide

c) Compound rest

d) Tool post

Ans:- c) compound rest

42. The following is used in magnetic chucks

a) Electro magnet

b) Permanent magnet

c) both a & b

d) None of the above

Ans:- c) both a & b

43. The following is used for holding bored parts for machining their outside surface on lathe

a) Mandrel

b) Dogs

c) Driving plate

d) Angle plate

Ans:- a) Mandrel

44. Assume a machining process of taper turning. In this process, a large diameter of taper is

“D” and it is uniformly decreased to the small diameter of taper “d” at the horizontal length of

tapered parts of work piece is “L”. What is the correct formula for half of taper angle (2α/2)?

a) α=sin-1 (CD-d/2L)

b) α=cos-1 (CD-d/2L)

c) α=tan-1 C(D-d/2L)

d) α=cot-1 C(D-d/2L)

Ans:-c) α=tan-1 C(D-d/2L)

45. Which of the following options best describes the centre lathe

a) Machining machines

b) Shaping machines

c) Turning machines

d) None of the above

Ans:- c) turning machines

46. Which type of process the machining can be?

a) Cold working

b) Hot working

c) Both A & B

d) None of the above

Ans:- a) cold working

47. When the tool of centre lathe moves perpendicular to the axis of rotation.

a) It produces a cylindrical surface

b) It produces a flat surface

c) It produces a tapered surface

d) None of the above

Ans:- b) it produces a flat surface

48. The foundation of the centre lathe is called as

a) Carriage

b) Tray

c) Base

d) Bed

Ans:- d) Bed

49. Which of the following is not a part of carriage of the centre lathe

a) Tool post

b) Apron

c) Compound rest

d) Gear box controls

Ans:- d) Gear box controls

50. Calculate time taken to face a workpiece of 100 mm diameter. The cross feed is 0.2

mm/revolution & spindle speed is 200 rpm.

a) 10 min

b) 5 min

c) 2.5 min

d) 1.25 min

Ans:- d) 1.25 min

51. What is swing over carriage

a) The maximum diameter of the work piece that can be rotated over the bed ways.

b) The minimum diameter of the work piece that can be rotated over the bed ways.

c) The maximum diameter of the work piece that can be rotated over the lathe saddle.

d) The minimum diameter of the work piece that can be rotated over the lathe saddle.

Ans:- c) The maximum diameter of the work piece that can be rotated over the lathe

saddle.

52. To prevent the bending of the slender shaft, while turning, it is recommended to

a) Run the machine at low speed

b) Have low feed

c) Low depth of cut

d) Use steady rest

Ans:- d) Use ready rest

53. A small ball shaped end can be turned on a lathe by__________

a) Using a form tool

b) Using a special attachment

c) Manipulating the operation of compound rest

d) Manipulating the operation of compound rest and carriage together

Ans:-d) Manipulating the operation of compound rest and carriage together

54. Turret and capstan lathe work more economical so

a) Tool setting time has been reduced

b) Work setting time has been reduced

c) Tool and work setting time have been reduced

d) They operate fast

Ans:- c) Tool and work setting time have been reduced

55. A multiple tool lathe has several single point tools operating simultaneously on the job

a) One carriage

b) Two carriage

c) More than two carriage

d) Carriage and a magazine

Ans:- c) more than two carriage

56. __________ Mechanism is employed for thread cutting.

a) Split nut mechanism

b) Half nut mechanism

c) Both A & B

None of the above

Ans:- b) Half nut mechanism

57. _________ is a device for holding and rotating a hollow piece of work.

a) Mandrel

b) Rest

c) Chuck

d) Face plate

Ans:- a) Mandrel

58. ________is a mechanical device support a long and slender work piece, which is turned

between centre

a) Rest

b) Mandrel

c) Chuck

d) Face plate

Ans:- a) Rest

59. __________ Lathe is used precision work on tools, dies, gauges, where more accuracy is

needed.

a) Bench lathe

b) Tool room lathe

c) Engine lathe

d) Centre lathe.

Ans:-b) Tool room lathe

60. The saddle of a lathe is.

a) V-shaped casting

b) H-shape casting

c) L- shape casting

d) None of the above

Ans: - b) H – shaped casting

61. The operations which are performed on a lathe by using special attachment are

a) Facing

b) Milling

c) Turning

d) Parting

Ans:- b) Milling

62. ________is the finishing operation after turning

a) Grooving

b) Filing

c) Parting

d) Thread cutting

Ans:- b) Filing

63. ________is the process of removing metal in the form of minute chips by feeding the work

against a rotating abrasive wheel

a) Grinding

b) Milling

c) Facing

d) Turning

Ans:-a) Grinding

64. ________is the operation of finishing and sizing a hole which has been previously drilled or

bored

a) Boring

b) Reaming

c) Parting

d) Shaping

Ans:- b) Reaming

65. _________is the operation of enlarging a hole through certain distance from one end instead

of enlarging the whole drilled surface

a) Counter boring

b) Spot facing

c) Boring

d) Enlarging

Ans:- a) Counter boring

66. The size of a lathe is specialized by

a) Maximum job length that may be held between centers.

b) Maximum diameter that can be rotated over centers.

c) Both A & B.

d) Total length of the lathe.

Ans:- c) Both A & B

67. The taper in a given work piece during a taper turning operation can be calculated by using

relation

a) D-d/2L

b) D-d/L

c) D-d/2

d) D+d/2

Ans:- a) D-d/2L

68. ________chuck is known as universal chuck.

a) Three jaw chuck

b) Four jaw chuck

c) Magnetic chuck

d) All of the above

Ans:- a) Three jaw chuck

69. Lathe machine bed made of ___________

a) Wrought iron

b) Grey iron

c) Steel

d) None

Ans :- b) Grey cast iron

70. Collet chuck is made of ____________steel.

a) Spring

b) Stainless

c) High carbon steel

d) None

Ans:- a) Spring Steel

71. _____is the process of embossing a diamond shaped pattern on the surface of the work

piece

a) Turning

b) Facing

c) Knurling

d) Parting

Ans:- c) Knurling

72. Non machining operation performed on lathe is

a) Spinning

b) Facing

c) Knurling

d) Parting

Ans: - a) Spinning

Unit -III

(Shaping, Planning, & Slotting Machines)

73. The operation mainly done on a shaping machine is

a) Turning

b) Machining a flat surface

c) Drilling

d) Grinding

Ans:- b) Machining a flat surface

74. In geared shaper, reciprocating motion of the ram is obtained by___

a) Hydraulic power

b) Rack and Pinion

c) Pneumatic

d) All

Ans:- b) Rack and Pinion

75. The ratio of forward stroke time to return stroke time is

a) 3 : 1

b) 5 : 3

c) 1 : 2

d) 3 : 2

Ans:- a) 3 : 2

76. Which is a Quick return mechanism?

a) Crank and slotted link mechanism

b) Hydraulic mechanism

c) Whitworth mechanism

d) All

Ans:- d) All of the above

77. In Shaper Machine ________ is mounted on the front vertical guide ways of column.

a) Saddle

b) Cross rail

c) Ram

d) Tool head

Ans:- b) Cross Rail

78. In Shaper Machine when the height of the job is less than the height of the jaws of the vise

______ are used to raise and seat the work piece.

a) Hold down

b) Shaper vises

c) Parallels

d) Swivel vise.

Ans :- c) Parallels

79. The cutting speed in a shaper is expressed by the formula

a) Cutting speed = length of the cutting stroke /time required by the cutting stroke

b) Cutting speed = time required by the cutting stroke/ length of the setting stroke

c) Cutting speed = 2(length of the cutting stroke)/time required by the cutting stroke

d) Cutting speed = ( length of the cutting stoke)/2(time required by the cutting )

Ans a) Cutting speed = length of the cutting stroke/ time requires by the cutting

stroke

80. _________ is the main moving part of a shaper

a) Ram

b) Column

c) Saddle

d) Base

Ans:- a) Ram

81. Quick Return mechanism is used in

a) Shaper

b) Lathe

c) Drilling

d) Grinding

Ans:- a) Shaper

82. Compared to forward stroke the return stroke in shaper is

a) Slower

b) Faster

c) Equal

d) None

Ans: - b) Faster

83. Goose neck tool is used in ________ machines.

a) Shaper

b) Planer

c) Both a & b

d) None

Ans: c) both a & b

84. According to the type of mechanism used for giving reciprocating motion to the ram shaper

can be classified as _____.

a) Crank type

b) Geared type

c) Both crank and geared type

d) None of the above

Ans:- c) both crank and geared type

85. Push type shaper is type of shaper according to _________

a) Design of the table