57) Which among the following gas flame combinations provide the highest temperature?

Oxy-acetylene

Oxy-hydrogen

Oxy-LPG

Air-acetylene

Answer is:

Oxy-acetylene

ISRO Technician-B Welder Question Paper - 2017 (Set -1) with Answer Key

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58) Backfire, a small explosion of flame occuring at the torch tip in oxy-acetylene process is due to

Gas pressure settting too low

Nozzle overheated

Nozzle orifice blocked by carbon deposits

Any of the above

Answer is:

Any of the above

59) An electrode is designated using IS coding as ER 4334. The type of covering used in the electrode is

Rutile

Basic

Cellulose

Acidic

Answer is:

Rutile

60) In which of the following destructive test methods is a saw cut ~ 1.5 mm made along the centre line of weld followed by hammer blow from reverse side

Nick break test

Free bend test

Fatigue test

Impact test

Answer is:

Nick break test

61) Post heating of a weldment is done in order to

Prevent the formation of hard and brittle spots in the weld

Relieve residual stresses in the weld

Both (a) and (b)

Prevent cracking of the weldment

Answer is:

ISRO Technician-B Welder Question Paper - 2017 (Set -1) with Answer Key

For more MCQ's Click Here

57) Which among the following gas flame combinations provide the highest temperature?

Oxy-acetylene

ISRO Technician-B Welder Question Paper - 2017 (Set -1) with Answer Key

Related ISRO Technician-B Welder Question Paper - 2017 (Set -1) with Answer Key

58) Backfire, a small explosion of flame occuring at the torch tip in oxy-acetylene process is due to

Any of the above

59) An electrode is designated using IS coding as ER 4334. The type of covering used in the electrode is

Rutile

60) In which of the following destructive test methods is a saw cut ~ 1.5 mm made along the centre line of weld followed by hammer blow from reverse side

Nick break test

61) Post heating of a weldment is done in order to

ISRO Technician-B Welder Question Paper - 2017 (Set -1) with Answer Key