2017 FEBRUARY TURNER THEORY SEMESTER - II

2017 FEBRUARY TURNER THEORY   SEMESTER - II

1. Which of the following centers is suitable while cutting taper by set over method?
a) Plain centre

b) Revolving centre

c) Half centre

d) Ball centre

answer:- d) Ball centre

2. To get least count of 5 in a Vernier bevel protractor, the 23° main scale are divided in to …..

a) 12 equal parts on a Vernier scale

b) 24 equal parts on a Vernier scale

c) 22 equal parts on a Vernier scale

d) 25 equal parts on a Vernier scale

answer:- d) 25 equal parts on a Vernier scale

3. Which one of the following statements indicates the principle followed in turning taper by
offsetting the tail stock?

a) The work axis is kept out of alignment with the lathe axis and the tool movement
are parallel to the lathe axis.

b) The work axis is kept in line with the lathe axis and the tool is made to move at an

angle to the lathe axis.

c) The work axis is kept out of alignment with the lathe axis and the tool is made to
move at angle to lathe axis.

d) The live and dead centers are moved in opposite directions to keep the work axis
out of alignment with lathe axis.

answer:-a) The work axis is kept out of alignment with the lathe axis and the tool movement
are parallel to the lathe axis.

4. Which one of the following methods of catching the threads consume more time when
cutting odd pitch threads?

a) Using thread chasing dial

b) Reversing the machining

c) Predetermined travel of the carriage

d) Marking on work holding device & lead screw.

answer:- d) Marking on work holding device & lead screw

5. When power feed is engaged while turning taper using taper turning attachment, it is noticed
that for short distance parallel turning takes place due to certain defect. Which one of the
following is the cause of this defect?

a) The positioning of the T/T attachment is not correct

b) The too setting is not at centre height

c) Work piece is not rigidly held

d) Play between the sliding units

answer:- b) The too setting is not at centre height

6.

6. Different types of threads have got different depths. Which one of the following has got the

highest depth?

a) Square

b) Worm

c) Acme d) Buttress

answer:- b) Worm

7. Which of the following methods of catching the threads takes the longest time?

a) Reversing the machine

b) Pre determined travel of the carriage

c) Marking on work holding device and catching the threads

d) Chasing dial

answer:- c) Marking on work holding device and catching the threads

8. By taper turning attachment, taper can be on any work piece which is held:-
b) Between centers
d) Neither (a) nor (b)

a) In a chuck

c) Either (a) or (b)

answer:- c) Either (a) or (b)

9. For calculation of the offset, we should consider,
a) Total length of the job

c) Diameter of the job

d) Both (a) & (b)

b) Length on which the taper is required
d) Both (a) & (b)

answer:- d) Both (a) & (b)

10. Which method of taper turning is shown in the figure below?

a) Taper turning attachment method

c) Form tool method

a) Compound rest method

b) Tail stock offset method
d) Compound rest method

answer:- b) Tail stock offset method

11. Which of the foflowing sorew thread forms ha, an inc,uded ang.e of & between flanks of
a)B.A. Thread        b)ACm£,hread        Stress thread     d> Knueicle thread

b) Acme thread        c) Buttress thread     d) Knuckle thread

answer:- b) Acme thread

12. An M30 thread is rough cut using a thread roughing tool. Which one of the following

statements is the correct procedure of  aligning the finishing tool with the thread groove:-

a) Work stationary, tool adjusted in the groove by compound slide and cross slide.

b) Work stationary, tool adjusted and positioned in the groove by carriage hand wheel

c) Work revolving, half nu. engaged, tool positioned in the groove by eompound slide

and cross slide.

d) Work revolving, half nut engaged, tool positioned in the groove by carriage and

cross slide hand wheels.

answer:- c) Work revolving, half nu. engaged, tool positioned in the groove by eompound slide

and cross slide.

13. Medium solder contains ………
a) 37% lead & 63% tin
c) 70% lead & 30% tin

b) 50% lead & 50% tin
d) None of these

answer:- b) 50% lead & 50% tin

14. The depth of B A screw thread is_.

a) 0.64 p b) 0.7035 p c) 0.6 p d) 0.61 p

answer:- c) 0.6 p

15. The value of each main scale division of Vernier bevel protractor is_

a) 1° b)5’ c) 1° 55' d) 1/2°

answer:- a) 1°

16. The tail stock barrel has an internal taper, which one of the following standard taper is

provided in the barrel bore_.

a) Metric taper b) Morse taper

c) Jarno taper d) Brown & Sharp taper

answer:- b) Morse taper

17. A British thread chasing dial has 16 teeth on the worm wheel and the lead screw has 4 threads
per inch. During one full turn of the dil, the carriage will move on the bed to a distance of

a) 1 inch b) 4 inches c) 8 inches d) 16 inches

answer:- a) 1 inch

18. In single start thread__.

a) Lead is half the pitch b) Lead is double the pitch

c) Lead and pitch are equal d) Pitch is half the Lead

answer:- c) Lead and pitch are equal

19. The amount of off set of tail stock for taper turning is done by the offset screws provided. The
procedure to be followed is_.

a) Loosen both screws and push the base to the amount of off set.

b) Loosen both screws and push the body to the amount of off set.

c) Loosen the screws in the direction of movement and tighten the other screw

d) Loosen the screws in the opposite to the direction of movement and tighten the
other screw.

answer:- d) Loosen the screws in the opposite to the direction of movement and tighten the
other screw.

20. Which one of the following statements does NOT provide the required information for
turning tapers using compound slide swivel method?

a) Big diameter, small diameter and total length of the work piece

b) Big diameter, small diameter and total length of the tapered work piece

c) The taper ratio and total length of the work piece.

d) The included angle and length of taper of the work piece.

answer:- Big diameter, small diameter and total length of the work piece

21. Which one of the following elements of an external BSW thread cannot be formed with
single point thread tool during threading?

a) Root b) Helix angle c) Crest d) Thread angle.

answer:- b) Helix angle

22. While measuring with Vernier bevel protractor, which part is used normally as reference
surface?

a) Stock b) Blade c) Dial d) Disc

answer:- a) Stock

23. Buttress threads are most commonly used for

a) Transmission of motion

b) Resisting force exerted in one direction only

c) Positioning of mechanical parts

d) Special bolts & units in structural work

answer:- b) Resisting force exerted in one direction only

24. Major diameter of thread X and Y shown below are the same The other thread element which
remains unchanged in both X and Y thread is:-

a) Helix angle b) Thread angle       c) Pitch diameter      d) Root diameter

answer:- d) Root diameter

25. The least count of  Vernier height gauge is:-

a) 0.01 mm b) 0.02 mm c) 0.05 mm d) 0.10 mm

answer:- b) 0.02 mm

26. Which one of the following abbreviations is used to specify an ACME thread:-
a) M16

b)  Rd20 X l/8M       c) s48X8 d) Tr60X9

answer:- b)  Rd20 X l/8M

27. The reason for NOT providing the rake angle on a form tool used to produce taper on a work
piece is_.

a) To reduce grinding time of the tool

b) Taper angle is not affected by re sharpening

c) To reduce wastage of tool material

d) For the tool to have large wedge angle

answer:- a) To reduce grinding time of the tool

28. One of the precision instruments used to check the dimensional accuracy of an external "V"
thread is a screw thread micrometer, which one of the following elements of screw thread is
checked with this instrument:-

a) Major diameter     b) Minor diameter    c) Pitch d) Pitch diameter

answer:- d) Pitch diameter

29. One of the methods of aligning lathe centers is trial cut method. The diameter of the tail stock
end is found to be bigger than the head stock end by 0.1 mm after the trail cut to correct the
alignment the tail stock body should be moved by>

a) 0.10mm away from the operator b) 0.10mm towards the operator

c) 0.05mm away from the operator d) 0.05mm towards the operator

answer:- b) 0.10mm towards the operator

30. A simple change gear train is used to cut a certain pitch thread. Due to non- availability of the
required gear from the set, down gear with 3 teeth more than that of the calculated value is
mounted. The thread that is cut will have a pitch:-

a) More for certain length and then less for the remaining thread length. *

b) More than that of required for the full threaded length.

c) Less than that of required for the full threaded length

d) Equal to that of required for the full threaded length

answer:-c ) Less than that of required for the full threaded length

31. While marking with a Vernier height gauge, the workplace is generally .-

a) Supported by another work piece b) Held by hand

c) Supported by an angle plate d) Held without support

answer:- c) Supported by an angle plate

32. While laying out, the Vernier height gauge must be used on the:-

a) Vee block b) Surface plate

c) Machine bed d) On any flat surface

answer:- b) Surface plate

33. Which one of the following formula is applied to find the tail stock off set, when turning
tapers by offset method?

answer:-C

34. Which one of the following instruments is used to measure accurately the angle of taper?
a) Bevel gauge b) Bevel protractor

c) Vernier bevel protractor d) Taper gauge

answer:- c) Vernier bevel protractor

35. Which one of the following statements is true in respect of taper turning using telescopic type
of taper turning attachment?

a) The tool post is pushed or pulled during axial movement of the saddle

b) The compound slide is pushed or pulled during the axial movement of the saddle

c) The cross slide is pushed or pulled during the axial movement of the saddle

d) The saddle itself is pushed or pulled during the axial movement of the saddle

 answer:- b) The compound slide is pushed or pulled during the axial movement of the saddle

36. In thread cutting with chasers on lathe the hand chasers are used for:-

a) Quick production of threads.

b) Cutting threads on soft metals directly

c) Rectifying threads cut on steel rods which are distorted.

d) Rectifying crest and root of threads formed by single point tool.

answer:- b) Cutting threads on soft metals directly

37. A centre gauge is used to:-

a) Check the pitch of the thread

b) Set the tool to exact centre height

c) Check the flank angle of a "V" threading tool

d) Determine the length of cutting edge of the "V" threading tool

answer:- b) Set the tool to exact centre height

38. Which one of the following methods of joining metals results in the fusion of the parent
metal?

a) Soldering b) Welding c) Brazing d) Riveting

answer:- b) Welding

39. A multi start square thread is to be cut on a lathe with single point tool. Which one of the
following angles of the tool is to be ground by taking into consideration, the thread helix
angle?

a) Side relief b) Front Clarence      c) Side rake d) Side clearance

answer:- c) Side rake

40. The principle of universal bevel protractor is similar to that of: -
a) Depth micrometer b) Dial test indicator

c) Vernier bevel protractor d) Fixed gauge

answer:- c) Vernier bevel protractor

41. By which one of the following methods, a multi start thread is cut on a lathe:-
a) By using a die head. b) By a chaser

c) By a single point tool d) BY a split die

answer:- b) By a chaser

42. A 200 mm long has one end dia is 100 mm and second dia is 80 mm. The taper

is_.

a) 0.01 mm b) 0.02 mm c) 0.04 mm d) 0.05 mm

answer:- a) 0.01 mm

43. During taper turning by offsetting tail stock method the part of tail stock offsetted is:-
a)Body b) Spindle c)Base d) Whole unit

answer:- a)Body

44. On which part of the Vernier bevel protractor, are the main scale divisions graduated?
a) Blade b) Disc c) Dial d) Stock

answer:- b) Disc

45. The size of a Vernier height gauge is specified by:-

a) Weight of the height gauge b) Size of the scriber

c) Height of the beam d) Width of the beam

answer:- c) Height of the beam

46. Which one of the following thread forms is provided on thread shafts, whose thread pitch is
expressed in module?

a) Buttress thread     b) Worm thread       c) Saw tooth thread   d) Knuckle thread

answer:- a) Buttress thread    

47. The taper per foot of BS 10 self-holding taper is___.

a) 0.5161 per foot     b) 0.5611 per foot     c) 0.6151 per foot     d) 0.611 per foot

answer:- c) 0.6151 per foot

48. Which one of the following angles is not ground on a form tool?
a) Front clearance angle b) Rake angle

c) Side clearance angle d) Relief angle

answer:- b) Rake angle

49. The graduations are marked at the base of the tail stock. To offset the body these graduations
are given in_.

a) Degrees b)mm

c) Taper per foot     

d) Radians

answer:- c) Taper per foot     

50. Which of the following combination of change of gears required when the pitch of a lead
screw is 6 mm and the pitch of the thread to be cut is 1.25mm?

a) Driving gears 40 & 120 and Driven gears 50 & 20

b) Driving gears 50 & 120 and Driven gears 40 & 20

c) Driving gears 50 & 20 and Driven gears 40 & 120

d) Driving gears 40 & 20 and Driven gears 120 & 50

answer:- c) Driving gears 50 & 20 and Driven gears 40 & 120