51) The presence of which of the following gases has the harmful effect of leading to cracking of a weldment?

Oxygen

Hydrogen

Nitrogen

Argon

Answer is:

Hydrogen

ISRO Technician-B Welder Question Paper - 2016 (Set -1) with Answer Key

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52) The word 'LASER' is an acronym for:

Light Amplification by Stimulated Emission of Radiation

Light Augmentation by Stimulated Emission of Radiation

Light Amplification by Sustained Emission of Radiation

Light Augmentation by Sustained Emission of Radiation

Answer is:

Light Amplification by Stimulated Emission of Radiation

53) In Gas metal arc welding, the metal transfer requiring lower current is:

Globular transfer

Short circuiting transfer

Spray transfer

Pulsed spray transfer

Answer is:

Short circuiting transfer

54) Flux used in submerged arc welding is in the form of:

liquid

granular

solid rod

solid tube

Answer is:

granular

55) The purpose of post heating of certain weld is to

Reduce hardness and brittleness

Increase hardness and brittleness

Reduce the toughness

Increase the cooling rate

Answer is:

Reduce hardness and brittleness

ISRO Technician-B Welder Question Paper - 2016 (Set -1) with Answer Key

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51) The presence of which of the following gases has the harmful effect of leading to cracking of a weldment?

Hydrogen

ISRO Technician-B Welder Question Paper - 2016 (Set -1) with Answer Key

Related ISRO Technician-B Welder Question Paper - 2016 (Set -1) with Answer Key

52) The word 'LASER' is an acronym for:

Light Amplification by Stimulated Emission of Radiation

53) In Gas metal arc welding, the metal transfer requiring lower current is:

Short circuiting transfer

54) Flux used in submerged arc welding is in the form of:

granular

55) The purpose of post heating of certain weld is to

Reduce hardness and brittleness

ISRO Technician-B Welder Question Paper - 2016 (Set -1) with Answer Key