2016 JULY TURNER THEORY SEMESTER - II

2016 JULY  TURNER THEORY SEMESTER - II

1. The pitch of the thread is_

a) The distance a nut will travel in one revolution on a multistart thread

b) The axial distance between a point on one thread to a corresponding point on the
adjacent thread

c) The tangent of helix angle multiplied by number of threads per inch

d) Equal to the number of threads per inch

Answer:- b) The axial distance between a point on one thread to a corresponding point on the
adjacent thread

2. The standard number of threads per inch for various diameters is the -

a) Series of thread

b) Lead

c) Major diameter

d) Thread pitch

Answer:- d) Thread pitch

3. This type of thread is a thread on the inside of a member -

a) Basic thread

b) External thread

c) Internal thread

d) Major diameter thread

Answer:- c) Internal thread

4. This is the smallest diameter of a screw thread -

a) Internal thread diameter

 b) Minor diameter

c) Major diameter

d) External thread diameter

Answer:- b) Minor diameter

5. The distance a screw thread advances axially in one turn is the -
a) Lead

b) Pitch

c) Turn

d) Crest

Answer:- a) Lead

6. This is the bottom surface joining the sides of two adjacent threads -
a) Lead

b) Pitch

c) Turn

d) Root

Answer:- d) Root

7. This type of fit is high quality and is used for the bulk of interchangeable screw thread
work -

a) Class 1

b) Class 2

c) Class 3

d) Class 4

Answer:- b) Class 2

8. These include taper pins, straight pins, dowel pins, clevis pins, and cotter pins -
a) General fasteners

b) Machine pins

c) Rivets

d) Hammer

Answer:- b) Machine pins

9. The person responsible for standardizing screw threads was_

a) Sir Joseph Whitworth

b) Joseph Portland

c) Major Carl Winton

d) Lalit Mishra

Answer:- a) Sir Joseph Whitworth

10. A screw thread that transmits power and has its face nearly at right angles to the major

axis is -

a) Whitworth

b) Knuckle

c) Square

d) Round

Answer:- a) Whitworth

11. This type of fastener is designed to prevent movement between shafts and wheels -
a) Keys

b) Machine pins

c) Rivets

d) Knuckle

Answer:- a) Keys

12. A mechanical device that stores energy, when deflected and to return the equivalent

amount of energy when released is known as a_.

a) Blind rivet  

b) Key way

c) Spring

d) Hammer

Answer:- c) Spring

13. The unit of a lathe that houses the lathe spindle and control levers for speed selection is

called__________

a) Tail stock

b) Carriage

c) Mead stock

d) Apron

Answer:- c) Mead stock

14. The method used for taper turning on a lathe machine is _

a) Compound rest method

b) Tail stock set over method

c) Taper Hinting attachment method

d) All of these

Answer:- d) All of these

15. The cutter in a milling machine is mounted on__

a) Arbor

b) Tool holder

c) Spindle

d) AH of these

Answer:- d) AH of these

16. The slowest speed in lathe is adopted for the following operation
a) Thread cutting

b) Taper turning

c) Knurling    

d) None of these

Answer:- a) Thread cutting

17. The job-supporting device that is bolted to the back end of the carriage and moved along

during machining operation is called____

a) Angle plate

b) Steady rest

c) Follower rest

d) Compound rest

Answer:- c) Follower rest

18. How do you specify a lathe____________

a) The height of the centres

b) Swing diameter over bed

c) The length between centres

d) All of these

Answer:- d) All of these

19. Lathe bed is made or__________________

a) Mi id steel

b) Stainless steel

c) Cast iron

d) None of these

Answer:- c) Cast iron

20. The tailstock is used to_

a) Support the other end of the work when it is being machined between centres

b) Holds a tool for performing operations such as drilling, reaming, tapping etc.

c) Both (a) & (b)

d) None of the above

Answer:- c) Both (a) & (b)

21. The taper of internal dovetail can be measured with the help of …..

a) Sine bar

b) Combination set

c) Balls of standard dimensions and slip gauges

d) Dial gauge

Answer:- c) Both (a) & (b)

22. In case of multi-start threads if p is pitch and N is No. of starts then the lead of screw
thread is_.

a)  p + N

b)  p-N
c)  p.N

d)  p/N

Answer:- c)  p. N

23. When machining, a hard and brittle metal like cast iron, the type of chips produced is -
a) Continuous chips

b) Discontinuous chips

c) Continuous chips with built up edge      

d) Fine chips

Answer:- b) Discontinuous chips

24. Radial distance from pitch circle to top of gear tooth -
a) Addendum

b) Dedendum

c) Diametral pitch

d) Die

Answer:- a) Addendum

25. Suitable range of temperature for brazing is -

a) 1100°C to 1150°C

b) 700°C to 800°C

c) 850°C to 900°C

d) 1000°C to 1050°C

Answer:- c) 850°C to 900°C

26. The function of taper turning process is to_

a) Reduce the diameter of a work piece along its length uniformity

b) Reduce the diameter of a work piece gradually to achieve larger dia at one end and
smaller dia at other end

c) Remove the material from end surface of a work piece

d) All of the above

Answer:- b) Reduce the diameter of a work piece gradually to achieve larger dia at one end and
smaller dia at other end

27. Which of the following is a mechanism for mechanized movements of the carriage along
longitudinal axis?

a) Cross-slide

b) Compound rest

c) Apron

d) Saddle

Answer:- b) Compound rest

28. A flat surface can be produced by a lathe machine, if the cutting tool moves

a) Parallel to the axis of rotation of workpiece

b) Perpendicular to the axis of rotation of workpiece

c) At an angle of 450

d) None of the above

Answer:- b) Perpendicular to the axis of rotation of workpiece

29. The thickness of layer material removed in one pass of workpiece under the cutter is
called as -

a) Single pass cut

b) Depth of cut

c) Width of cut

d) Face cut

Answer:- b) Depth of cut

30. The angle between side cutting edge and end cutting edge is called as -
a) Approach angle

b) Nose angle

c) Side relief angle

d) End relief angle

Answer:- b) Nose angle

31. Lead angle in the single point cutting tool is the angle between -

a) The end cutting edge and the normal to the tool shank

b) The portion of side shank immediately below the side cutting edge and the line
perpendicular to the base of the tool

c) The tool face and the parallel to the base of the tool

d) Side cutting edge and the side of the tool shank

Answer:- d) Side cutting edge and the side of the tool shank

32. The surface of the single point cutting tool on which the chips formed in cutting

operation slide is called as -

a) Flank

b) Heel

c) Face

d) Shank

Answer:- c) Face

33. Gas welding is a type of -
a) Constant mass process
b) Material removal process
c) Material addition process

d) None of these

Answer:- c) Material addition process

34. Joint strength in brazing operation is -

a) As high as in gas or arc welding

b) Not as high as in gas or arc welding

c) Higher than that of in gas or arc welding

d) Unpredictable

Answer:- b) Not as high as in gas or arc welding

35. Why l is used as joining medium in brazing operation?

a) Copper-zinc alloy

b) Nickel-silver alloy

c) Lead-tin alloy

d) All of these

Answer:- a) Copper-zinc alloy

36. Which of the following is a soft solder?

a) Copper-zinc alloy

b) Nickel-silver alloy

c) Lead-tin alloy

d) All of these

Answer:- c) Lead-tin alloy

37. 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 the taper 'd’ at the horizontal
length of tapered part of workpiece is 'L'. What is the correct formula for half of taper

angle (2a / 2)?

a) a = sin̵̵̵ ¹ [(D - d) / 2L]
c) a ~ tan̶   ¹ [(D - d) / 2L)

b) a = cos ̶  ¹   [(D - d) / 2L]
d) a = cot̶̶ ¹   [(D - d) / 2L]

Answer:- c) a ~ tan ̶ ¹ [(D - d) / 2L)

38. What is swing over carriage?

a) The maximum diameter of workpiece that can be rotated over the bed ways

b) The minimum diameter of workpiece that can be rotated over the bed ways

c) The maximum diameter of workpiece that can be rotated over lathe saddle

d) The minimum diameter of workpiece that can be rotated over lathe saddle

Answer:- c) The maximum diameter of workpiece that can be rotated over lathe saddle

39. 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

Answer:- d) Gear box controls

40. Which method gives accurate results when effective diameter is measured without
considering the thread angle?

a) Two wire method

b) Three wire method

c) Best wire size

d) All of these

Answer:- b) Three wire method

41. Which type of threads are used to transmit power in one direction?
a) Square threads

b) Buttress threads

c) Both (a) &(b)

d) None of these

Answer:- b) Buttress threads

42. Calculate diameter of best wire for a Withworth thread of M 24 x 7 mm size -
a) 4.04 mm

b) 7.8 mm

c) 3.94 mm

d) 8.08 mm

Answer:- c) 3.94 mm

43. What is used to measure the major diameter of an external thread?
a) Bench micrometer

b) Thread micrometer

c) One wire method

d) All of these

Answer:- d) All of these

44. Why are pitch errors observed in threads?

a) Lack of inspection

c) Interference between mating parts

b) Incorrect ratio of tool work velocity
d) All of these

Answer:- d) All of these

45. Which thread has a combined strength of square thread and V thread?

a) Acme thread

b) Knuckle thread

c) Buttress thread

d) British standard Whitworth thread

Answer:- a) Acme thread

46. Which comparator is used to check the flatness of the taper job in taper checking setting?
a) Vernier caliper

b) Bevel protractor

c) Vernier height gauge

d) Dial test indicator

Answer:- d) Dial test indicator

47. When cutting a right hand external metric * V* thread with a single point tool by half
included angle method, the compound slide is swiveled at 29°-
a) Towards right to the horizontal axis      

b) Towards left to the horizontal axis
c) Towards left to the vertical axis

d) Towards right to the vertical axis

Answer:- d) Towards right to the vertical axis

48. In which one of the following standard tapers, it is easy to determine the taper dimensions

when the specification is given in number -

a) Brown and sharpe

b) Metric

c) Morse

d) Jamo

Answer:- d) Jamo

49. The taper ratio of the standard metric self holding taper is -
a) 1 : 20

b) 1 : 25

c) 1: 30

d) 1:50

Answer:- d) 1:50

50. When the taper is expressed as a ratio the formula to determine the compound slide
swivel angle (θ) is -

Answer:-C