In resistance brazing, the source of power supply is

Step-up transformer

Step-down transformer

One-to-one transformer

No transformer

Answer is:

Step-down transformer

Explanation:

In resistance brazing, the source of power supply is Step-down transformer.

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35) Spelter is a brazing alloy consisting normally of

50% copper and 50% zinc

50% copper and 50% lead

50% lead and 50% zinc

50% copper and 50% tin

Answer is:

50% copper and 50% zinc

Explanation:

Spelter is a brazing alloy consisting 50% copper and 50% zinc.

36) In this method of brazing, the melting point of the filler metal ranges from 620 Degree C to 800 Degree C and it is used in instrument making. The method is

silver brazing

induction brazing

dip brazing

torch brazing

Answer is:

silver brazing

Explanation:

37) Why would it be impossible to braze aluminium with normal brass brazing rods ?

Because aluminium is too hard

Because aluminium has a too low melting point and would melt before brass

Because aluminium has a too high melting point and will not melt

Because aluminium is non-ferrous metal

Answer is:

Because aluminium has a too low melting point and would melt before brass

Explanation:

It is impossible to braze aluminium with normal brass brazing rods because, aluminium has a too low melting point and would melt before brass.
Melting Temperature of Brass normally 900 Degree Centigrade to 940 Degree Centigrade.
Melting Temperature of aluminium normally around 660.3 Degree Centigrade.

38) Which of the following abrasive materials would be used to clean the steel before brazing ?

Wet and dry silicon carbide paper

Emery cloth

Wire wool

Aluminium oxide paper

Answer is:

Emery cloth

Explanation:

Emery cloth is used as abrasive materials to clean the steel before brazing.

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