Electric Welding MCQs

46. A rectifier for welding has voltage/current characteristic as

(a) static
(b) variable
(c) drooping
(d) rising

Answer
Answer. c

47. Which of the following is net a welding accessory?

(a) Hand screen
(b) Cable
(c) Electrode holder
(d) Gloves

Answer
Answer. b

48. Gray iron is usually welded by

(a) Gas welding
(b) TIG welding
(c) MIG welding
(d) Arc welding

Answer
Answer. a

49. The welding load is always

(a) continuous but varying
(b) continuous and constant
(c) intermittent
(d) none of the above

Answer
Answer. c

50. TIG welding is

(a) thorium iodine gas welding
(b) thermally induced gas welding
(c) temperature insulated gas welding
(d) tungsten insert gas welding

Answer
Answer. d

51. Flux used in TIG welding is

(a) borax
(b) ammonium chloride
(c) ash
(d) none

Answer
Answer. d

52. For the welding of aluminium alloys which of the following methods would you recommend?

(a) Acetylene-oxygen gas welding
(b) D.C. arc welding
(c) A.C. arc welding
(d) Tungsten arc welding

Answer
Answer. d

53. Which of the following automatic welding processes is likely to give the maximum rate of metal deposition?

(a) Continuous flux covered electrode
(b) Multiple power submerged arc
(c) Gas shielded bare wire
(d) Submerged arc (single wire)

Answer
Answer. b

54. A 10 SWG electrode usually operates in the current range

(a) 300 to 400 amperes
(b) 95 to 135 amperes
(c) 50 to 65 amperes
(d) 20 to 30 amperes

Answer
Answer. b

55. Which of the following electrodes will have the least diameter?

(a) 20 SWG
(b) 16 SWG
(c) 14 SWG
(d) 4 SWG

Answer
Answer. a

56. The danger of shock is maximum

(a) before welding
(b) after arcing
(c) during arcing
(d) while inserting an electrode into the holder

Answer
Answer. d

57. The welding electric circuit is

(a) never earthed
(b) always earthed
(c) through cables only

Answer
Answer. b

58. Steel rails are welded by

(a) Gas welding
(b) Thermit welding
(c) Resistance welding
(d) Argon arc welding

Answer
Answer. b

59. In ultrasonic welding, the frequency range is generally

(a) 2000 to 3000 Hz
(b) 4000 to 20000 Hz
(c) 30000 to 40000 Hz
(d) 50000 to 80000 Hz

Answer
Answer. b