ITI Trade Fitter,Turner,Machinist Important Question with Answer

BLOCK : 4 
Trade Fitter, Machinist, Turner Important Question with Answer
ट्रेड थ्योरी क्वेश्चन पेपर

1 . 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
2 . The high cutting speed and large rake angle of the tool will result in the formation of

      (A) Continuous chips

      (B) Discontinuous chip

      (C) Continuous chips with built up edge

      (D) None of these      Answer: A

3 .The facing is an operation of

      (A) Beveling 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) Machining the ends of a workpiece to produce a flat surface square with the axis

              Answer:  D

4 . Fixtures 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:  B

5 . In a shaper, the length of stroke is increased by

       (A) Increasing the centre distance of bull gear and crank pin

       (B) Decreasing the centre distance of bull gear and crank pin

       (C) Increasing the length of the arm

       (D) Decreasing the length of the slot in the slotted lever       Answer: A

6 . The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.

       (A) Equal to

       (B) Smaller than

       (C) Greater than

       (D) None of these     Answer:  B

7 . 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

8. 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

9. Ceramic cutting tools are

      (A) Made by cold pressing of aluminium oxide powder

      (B) Available in the form of tips

      (C) Brittle and have low bending strength

      (D) All of these              Answer: D

10.  The point angle of a drill, for drilling stainless steel, is

       (A) 90°

       (B) 118°

       (C) 135°

       (D) 150°                           Answer: C

11. 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

12.Which of the following operation is first performed?

      (A) Spot facing

      (B) Boring

      (C) Tapping

      (D) Drilling                           Answer:  B

13. The parameter which completely defines the chip formation in a metal cutting process is

      (A) Shear angle

      (B) Chip-tool contact length

      (C) Both (A) and (B)

      (D) None of these                  Answer: C

14. The cutting speed of a drill depends upon the

      (A) Material of drill

      (B) Type of material to be drilled

      (C) Quality of surface finish desired

      (D) All of these                          Answer: D

15. 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

16. 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

17. Which one among the following welding processes uses non-consumable electrode?

         (A) Gas metal arc welding

         (B) Submerged arc welding

         (C) Gas tungsten arc welding

         (D) Flux coated arc welding         Answer: C

18. What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?

          (A) Thermit welding

          (B) Electroslag welding

          (C) Resistance welding

          (D) Submerged arc Welding       Answer: C

19. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as _______ double cover butt joint.

         (A) Single riveted

         (B) Double riveted

         (C) Both (A) and (B)

         (D) None of these                         Answer: B

20. In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.

         (A) Globular transfer

         (B) Spray transfer

         (C) GMAW practice

         (D) Dip transfer                           Answer: C

21. 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

22. The common welding error that occurs due to shrinkage of weld metal, faulty clamping of parts, faulty penetration or overheating at joints is called?

          (A) Distortion

          (B) Warping

          (C) Porous weld

          (D) Poor fusion                     Answer: B

23. The object of caulking in a riveted joint is to make the joint

          (A) Free from corrosion

          (B) Stronger in tension

          (C) Free from stresses

          (D) Leak-proof                        Answer:  D

24. 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

25. What is the method of brazing used to join relatively small assemblies made from materials that either do not oxidize at the brazing temperature or can be protected from oxidation with a flux?

          (A) Torch brazing

          (B) Dip brazing

          (C) Resistance brazing

          (D) Furnace brazing                                    Answer:  A

26. 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. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.

          (A) 2.17 rpm, 600 joules

          (B) 6.8 rpm, 6 joules

          (C) 5.03 rpm, 600 joules

          (D) 22 rpm, 600 joules                              Answer:  A

27. In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as

         (A) Fusion

         (B) Reverse polarity

         (C) Forward welding

         (D) Direct polarity                                    Answer:  B

28. What is the welding defect caused due to improper control and poor removal of slog between passes called?

         (A) Mismatch

         (B) Under fill

         (C) Crack

         (D) Porosity                                            Answer:  B

29. The common welding error that occurs due to wrong speed, faulty preparation, and high / low current, improper electrode size is called?

          (A) Distortion

          (B) Warping

          (C) Porous weld

          (D) Poor fusion                               Answer:  D

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. In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate

          (A) Increases continuously

          (B) Decreases continuously

          (C) Decreases becomes stable and then increases

          (D) Increases, becomes stable and then decreases      Answer:  D

32. Match the following metal forming processes with their associated stresses in the work piece.

Metal forming process                          Types of stress

     1. Coining                                             P. Tensile

     2. Wire Drawing                                Q. Shear

     3. Blanking                                          R. Tensile and compressive

     4. Deep Drawing                                S. Compressive

                                           (A) 1-S, 2-P, 3-Q, 4-R

                                           (B) 1-S, 2-P, 3-R, 4-Q

                                           (C) 1-P, 2-Q, 3-S, 4-R

                                           (D) 1-P, 2-R, 3-Q, 4-S           Answer:  A

33. In an interchangeable assembly, shafts of size 25.000 -0.010⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.020⁺⁰∙⁰³⁰, the maximum interference (in microns) in the assembly is

        (A) 40

        (B) 30

        (C) 20

        (D) 10                                     Answer: C

34. During normalizing process of steel, the specimen is heated

        (A) Between the upper and lower critical temperature and cooled in still air.

        (B) Above the upper critical temperature and cooled in furnace.

        (C) Above the upper critical temperature and cooled in still air.

        (D) Between the upper and lower critical temperature and cooled in furnace.         Answer: Option C

35. A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is

        (A) 120

        (B) 170

        (C) 180

        (D) 240                                          Answer: B

36. A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25 mm. The percentage change in diameter is

        (A) 0

        (B) 2.07

        (C) 20.7

        (D) 41.4                                         Answer:  D

37. The maximum possible draft in cold rolling of sheet increases with the

         (A) Increase in coefficient of friction

         (B) Decrease in coefficient of friction

         (C) Decrease in roll radius

         (D) Decrease in roll velocity           Answer:  A

38. The operation in which oil is permeated into the pores of a powder metallurgy product is known as

          (A) Mixing

          (B) Sintering

          (C) Impregnation

          (D) Infiltration                                 Answer:  C

39. A hole is of dimension φ = 9 ₊0⁺⁰∙⁰¹⁵ mm. The corresponding shaft is of dimension φ = 9 ₊0.001⁺⁰∙⁰¹⁰ mm. The resulting assembly has

          (A) Loose running fit

          (B) Close running fit

          (C) Transition fit

          (D) Interference fit                        Answer:  C

40. The crystal structure of austenite is

          (A) Body centered cubic

          (B) Base centered cubic

          (C) Hexagonal closed packed

          (D) Body centered tetragonal      Answer:  B

41. The material property which depends only on the basic crystal structure is

          (A) Fatigue strength

          (B) Work hardening

          (C) Fracture strength

          (D) Elastic constant                           Answer:  C

42. A shaft has a dimension, φ9 +0.025⁺⁰∙⁰⁰⁹, 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

43. 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

44. 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

45. The effective number of lattice points in the unit cell of simple cubic, body centered cubic, and face centered cubic space lattices, respectively, are

            (A) 1, 2, 2

            (B) 1, 2, 4

            (C) 2, 3, 4

            (D) 2, 4, 4                                                         Answer: B

 46. Which type of motor is not used in axis or spindle drives of CNC machine tools?

            (A) Induction motor

            (B) DC servo motor

            (C) Stepper motor 

            (D) Linear servo motor                                 Answer:  C

47. 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             Answer:  D

48. NC contouring is an example of

          (A) Continuous path positioning

          (B) Point-to-point positioning

          (C) Absolute positioning

          (D) Incremental positioning                                   Answer:  A

49. A ring gauge is used to measure

         (A) Outside diameter but not roundness

         (B) Roundness but not outside diameter

         (C) Both outside diameter and roundness

         (D) Only external threads                                          Answer:  A

50. When the temperature of a solid metal increases,

          (A) Strength of the metal decreases but ductility increases

          (B) Both strength and ductility of the metal decreases

          (C) Both strength and ductility of the metal increases

          (D) Strength of the metal increases but ductility decreases      Answer: A