2017 JULY TURNER THEORY SEMESTER - II

2017 JULY TURNER THEORY SEMESTER - II

1. The slowest speed in lathe is adopted for following operation -

turning ' b. Thread cutting

c. Taper turning d. Knurling

Answer:-  b. Thread cutting

2. The composion of soft solder is -

a. Lead-37%, tin 63% . b. Lead-67%, tin 37%

c. Lead-70%, tin 30% d. a. Normal Lead 50%, tin 50%

Answer:- a. Lead-37%, tin 63% .

3. The welding process used in joining mild steel shanks to high speed drill is -
a. Spot welding b. Seam welding

c. Flash butt welding d. Upset butt welding

Answer:- c. Flash butt welding

 4. For arc welding -

a. Direct current is used

b. Alternating current with high frequency is used
c. Alternating current with low frequency is used

d. None of' these-

Answer:- a. Direct current is used

5 Which of the following welding process uses non-consumable electrodes?

a. Manual arc welding b.- Submerged arc welding

. c.TIG welding .   d.Mig welding

Answer:- c.TIG welding

6. The oxy-acetylene gas used in gas welding produce a flame temperature of
a. 1800°C b. 2100.°C

c. 2400°C d- 3200°c

Answer:- d- 3200°c

7. The purpose of using borax in brazing is -

a. Dissolve oxides when heating the work
' b. Prevent the spelter from melting too quickly

c. Increase fluidity of braze material

d. Accelerate the formation of oxides on the work

Answer:- a. Dissolve oxides when heating the work

8. When brazing is carried out -

a. A joint is made between two parts by molten spelter

b. The edges of the joint melt and run together

c. Spelter forms an alloy with flux

d. Flux acts as a connecting material

Answer:- . A joint is made between two parts by molten spelter

9. Heat for soldering process is supplied by -

•   a. Soldenng iron , b. Induction furnace

c. Electric resistance welding d. None of these

Answer:- a. Soldenng iron

10. The brazing process is carried in the temperature range of -

a. 150°Cto250cC b. 250°C to 450°C

c. 500°C to 700°C d. 700°C to 900°C

Answer:- d. 700°C to 900°C

11. In soldering the melting point of filler metal is -

a. Below 420°C b. Above 420°C

c. Below 520°C d. Above 520oC

Answer:- b. Above 420°C

12. The rate of feed depends upon -

a. Finish required b. Material of drill

c. Material to be drilled d . All of these

Answer:- a. Finish required

13. For a 5° taper over 5 mm length is to be made on a 100 mm diameter which job Method
should be used ?

a. Taper turning attachment . b. Tailstock offset method

c. Compound rest method

d. Form tool method

Answer:- d. Form tool method

14. The smallest diameter of an external or internal screw thread is known as -
•   a- diameter   • -   . b. Major diameter

c. Pitch diameter d. None of these

Answer:- a- diameter  

15. The included angle for Acme thread is —

a- 29° .. b. 47.5°

d. 60°

c. 55°

Answer:- a- 29°

16. Which thread have low friction resistance chracteristic of the square thread and have the
strength of V-threads?

a. Square threads ' b. Acme threads

c. Knuckle threads ■.    d. Buttress threads

Answer:- d. Buttress threads

17. The included angle for British standard whitworth thread is -

a-29° b. 47.5°

c- 55° . d. 60°

Answer:- c- 55°

18. The bottom surface created by the two adjacent flanks of the thread is called-
a. Lead b. Turn

c. Crest ' d. Root

Answer:- d. Root

19. The distance from a point on the thread to the corresponding point of the next thread is called-
a. Lead b. Pitch

' c. Turn .  .   . d. Crest , .,

Answer:- b. Pitch

20. Combination set can be used -

a. Check angular surface b. Scribe lines

c. Draw circle and arcs d. Draw circle and arcs

Answer:- a. Check angular surface

21. The crest diameter of screw thread is same as -

a. Major diameter b. Minor diameter

c. Core diameter d. Pitch diameter

Answer:- a. Major diameter

22. For application involving high stresses in one direction only the following type of thread would
be best suited —

a. Metric thread . b. Square thread

c. Acme thread d. Buttress thread

Answer:- d. Buttress thread

23. If threads on a bolt are left hand, threads on nut will be -

a. Right hand with same pitch b. Left hand with same pitch

c. Right hand with fine pitch d. Left hand with fine pitch

Answer:- b. Left hand with same pitch

24. A bench vice has which type of threads?

a. Metric b. Square

c. Acme d. British associate

Answer:- c. Acme

25. Silver-based solder is used for -

a. Flaring b. Brazing

c. Soft soldering d. Fusion welding

Answer:- b. Brazing

26. The distance which a screw thread advance axially in one rotation of the nut is called -
a. Lead b. Pitch

c. Turn d. Crest

Answer:- a. Lead

27. The lead screw of a lathe has..........threads.

a. Single start b. Double start

c. Multi start d. All of these

Answer:- a. Single start

28. Screw thread may be cut on a 10 mm dia. Steel rod by using -

a. A circular split die b. A set of Taps

c. Adrill and a reamer d. As knurling tool

Answer:- a. A circular split die

29. The lathe centres are provided with standard taper known as -

a. Morse taper b. Seller's taper

c. Chapman taperq d. Brown and sharpe taper

Answer:- a. Morse taper

30- Calculate diameter of best wire for a withworth thread or M24 X 7 mm size -
a. 4.04 mm b. 7.8 mm

c;3.94mm d. 8.08Trim

Answer:- c;3.94mm

31. Calculate lead angle of a thread which has mean diameter of 45 mm and lead of 10

a. 8.5° b. 4.04°

c. 3.02 ° d. 4.02 0

Answer:- b. 4.04°

32. External screw threads can be produced fastest by -

a. Milling b. Chasing

c. Casting d. Rolling

Answer:- d. Rolling

33. Internal and external tapers on a turret lathe can be turned by -

a. Face turning attachment b. Taper turning attachment

c. Moarse taper attachment d. Sliding attachment

Answer:- b. Taper turning attachment

34. Brown and sharp taper is generally used in ~

a. Lathe machine

b. Milling machine

c. Shaper machine. d. Broching rnachine

Answer:- b. Milling machine

3 5. Half nut is connected with-

a. Locking device

b. JIG and Fixtures

c. Thread cutting on lathe

d. Quick engaging and disengaging device

Answer:- c. Thread cutting on lathe

36. In which type of welding a pool molten metal is used?

a. Submerged arc b. MIG

c. TIG d. Thermit welding

Answer:- a. Submerged arc

37. Which of the following screw thread is adopted for power transmission in either direction?
a. Acme threads

b. Square threads

c. Buttress threads d. Multiple threads

Answer:- b. Square threads

38. Jig & Fixtures are used for —

a. Mass production i     b. Identical parts production

c. Both (a) & (b)

d. None of these

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

39. The included angle of taper in collet is usually -

a. 1-2°

b. 5-10°

c.30°

d.45°

Answer:- c.30°

40. A slight taper on the full length of a long shaft mounted between centres on a universal
cylindrical grinder can be ground by -

a. Off setting the tail stock b. Swiveling the table on its base

. c. Swiveling the wheel head d. Taper turning attachment

Answer:- c. Swiveling the wheel head

41. The flux commonly used in brazing is -

a. Zinc chloride b. Ammonium chloride

c- Rosin plus alchol d. Borax

Answer:- d. Borax

42. 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. By a swiveling the compound rest

Answer:- b. By setting over the tail stock

43. For turning internal tapers, the suitable method is -

a. By a form tool

b. By setting over the tail stock

c. By a taper turning attachment

d. By a swiveling the compound rest

Answer:- c. By a taper turning attachment

44. Which one of the following is used for taper turning method on lathe?

a. Tail stock set over method .   b. By swivelling the compound rest

c. Using a broad nose tool      . d. All of these

Answer:- d. All of these

45. The purpose of chasing dial on lathe is to achieve -

a. Picking up the thread accurately at beginning of each cut

b. Taper turning

c. Cutting of tapered threads

d. Cutting of multiple threads

Answer:- a. Picking up the thread accurately at beginning of each cut

46. Short and sharp angle tapers are machined using -

a. A taper attachment b. The compound rest

c. Morse taper attachment d. The tailstock set over method

Answer:- b. The compound rest

47. A desired speed of_

proper number of teeth,
a. Lead screw
c. Spindle

can be obtained by selecting the suitable change gears having

b. Countershaft
d. Feed gear box

Answer:- a. Lead screw

48. Assume a machining process of taper turning. In this process, a large diameter of taper is 'D'
and it is uniformly decreased to ther 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 tapper angle (2a / 2)?

Answer:-A

49. 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:- . The maximum diameter of workpiece that can be rotated over lathe saddle

50. An alloy is a -

a. Fuse metal

b. Mixture of metals in any proportion
c. Mixture of metals in fixed proportion

d. Mixture of two non-metals

Answer:- b. Mixture of metals in any proportion