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ISRO Technician-B Welder 2017
55

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

55) In arc welding process, better arc stability is achieved with

Alternating current

Direct current with straight polarity

Direct current with reverse polarity

Arc stability is independent of the nature of current employed

Answer is:

Alternating current

Explanation:

In arc welding process, better arc stability is achieved with Alternating current.

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

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56) Purpose of using flux in soldering is to

Increase the fluidity of solder metal

Prevent formation of oxides

Lower the melting point of solder

Wash away the surplus solder

Answer is:

Prevent formation of oxides

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

Oxy-acetylene

Oxy-hydrogen

Oxy-LPG

Air-acetylene

Answer is:

Oxy-acetylene

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

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

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55) In arc welding process, better arc stability is achieved with

Alternating current

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

56) Purpose of using flux in soldering is to

Prevent formation of oxides

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

Oxy-acetylene

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

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