27) Acetylene is a chemical compound of

Carbon and oxygen

Carbon and nitrogen

Carbon and hydrogen

Carbon and calcium

Answer is:

Carbon and hydrogen

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

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28) Which of the following electrodes can be used on both AC and DC welding machines?

carbon electrode

aluminium electrode

metal electrode

mild steel coated electrode

Answer is:

mild steel coated electrode

29) Preheating of copper is done before welding because:

to prevent oxidation

of its high thermal conductivity

it makes welding easier

it helps to control shrinkage

Answer is:

of its high thermal conductivity

30) The welding process widely employed to weld railway rails is:

Thermit welding

Percussion welding

Ultrasonic welding

Explosive welding

Answer is:

Thermit welding

31) In gas tungsten arc welding, the shape of the tip of tungsten electrode used for welding of aluminium is

Point end

Flat end

Angular end

Spherical end

Answer is:

Spherical end

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

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27) Acetylene is a chemical compound of

Carbon and 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

28) Which of the following electrodes can be used on both AC and DC welding machines?

mild steel coated electrode

29) Preheating of copper is done before welding because:

of its high thermal conductivity

30) The welding process widely employed to weld railway rails is:

Thermit welding

31) In gas tungsten arc welding, the shape of the tip of tungsten electrode used for welding of aluminium is

Spherical end

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