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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26) Which one of the following factors is taken into account while selecting a nozzle for gas welding?

Flux melting point

base metal melting point

filler metal melting point

temperature of flame to be set

Answer is:

base metal melting point

27) Acetylene is a chemical compound of

Carbon and oxygen

Carbon and nitrogen

Carbon and hydrogen

Carbon and calcium

Answer is:

Carbon and hydrogen

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

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

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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

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

26) Which one of the following factors is taken into account while selecting a nozzle for gas welding?

base metal melting point

27) Acetylene is a chemical compound of

Carbon and hydrogen

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

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