2016 FITTER THEORY SEM-IV

2016 FITTER THEORY SEM-IV

31. The composition of soft solder is____

a) Lead-37%, tin-63%

b) Lead-50%, tin-50%

c) Lead-63%, tin-37%

d) Lead-70%, tin-30%

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

32. Corrosion can be prevented by_

a) Alloying

b) Tinning

c) Galvanizing

d) All of these

Answer:- d) All of these

33. As compare to iron, aluminum has ....

a) Higher tendency to oxidize

b) Less tendency to oxidize

c) Equal tendency to oxidize

d) None of these

Answer:- a) Higher tendency to oxidize

34. Conditions for good electroplating

 is/are .......

a) High current density

b) Low temperature

c) High concentration of metal in electrolyte

d) All of these

Answer:- d) All of these

35. Iron is galvanized by coating with ...............

a) Zinc

b)Tin

c) Copper

d) Nickel

Answer:- a) Zinc

36. Which defect arises due to faulty

 heat treatment?

a) Over heating and burring

b) Oxidation and decarburization

c) Cracks, distortion and warping

d) All of these

Answer:- d) All of these

37. In general, hardening is followed by ....

a) Annealing

b) Normalizing

c) Tempering

d) Case hardening

Answer:- a) Annealing

38. 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

39. 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

40. 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