| 1. | The preferred material for soldering bit is ? | |
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lead
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zinc
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copper
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tin
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Report Question| 2. | Which one of the joint fails first due to increase in temperature ? | |
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riveting
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soldering
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brazing
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welding
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| 3. | How to extinguish the flame after use in gas welding ? | |
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Shut off oxygen and acetylene valve at a time
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Shut of oxygen and dip blow pipe in water
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Shut off oxygen valve first next acetylene valve
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Shut off acetylene valve first next oxygen valve
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| 4. | What will cause if the nozzle touches the molten pool ? | |
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flash back
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spark
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back fire
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smoke
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| 5. | The width of cut produced in gas cutting operation is know as ? | |
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gauging
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kerf
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drag
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bavel
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| 6. | In DC welding heat distribution is possible between electrode and the base metal due to the change of polarity. The distribution of heat is ? | |
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positive 2/3 and negative 1/3
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positive 1/3 and negative 2/3
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positive 1/4 and negative 3/4
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positive 3/4 and negative 1/4
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| 7. | One of the functions of electrode coating is ? | |
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to increase welding current
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to stabilize the arc
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to prevent rusting
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to control arc temperature
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| 8. | In reverse polarity welding ? | |
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electrode holder is connected to the negative and the work is positive
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work is positive holder is earth
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work is negative holder is earth
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electrode holder is connected to the positive and the work is negative
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| 9. | Acetylene is stored in the gas cylinders ? | |
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in gaseous form
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in liquid form
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in solid form
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under high pressure
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| 10. | When brazing is completed workpiece should be cooled ? | |
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slowly
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rapid
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under cool water
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at any rate
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