21) In spot welding process, the size of nugget is controlled by:

Time

Current

Pressure

Electrode contact area

Answer is:

Electrode contact area

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

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22) The probable defect if cast iron is welded without preheating is

Porosity

Blow hole

Under cut

Crack

Answer is:

Crack

23) The purpose of setting root gap in a butt weld joint is:

To control distortion

To obtain required depth of fusion

To maintain the alignment

To deposit more metal

Answer is:

To obtain required depth of fusion

24) Which of the following non-destructive test methods cannot be employed to detect defects inside the weldment?

Ultrasonic test

Dye Penetrant test

X-ray test

Gamma ray test

Answer is:

Dye Penetrant test

25) Low hydrogen electrodes are baked prior to use in order that

proper strength is obtained

welding is free from arc blow

welding is free from moisture pick up

current required is minimum

Answer is:

welding is free from moisture pick up

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

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21) In spot welding process, the size of nugget is controlled by:

Electrode contact area

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

22) The probable defect if cast iron is welded without preheating is

Crack

23) The purpose of setting root gap in a butt weld joint is:

To obtain required depth of fusion

24) Which of the following non-destructive test methods cannot be employed to detect defects inside the weldment?

Dye Penetrant test

25) Low hydrogen electrodes are baked prior to use in order that

welding is free from moisture pick up

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