1. In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines. This is due to ?

to slow cutting speed

impure cutting oxygen

less preheating flame

smaller size cutting nozzle

Answer: to slow cutting speed

Explanation:


2. A welding transformer is used to convert ?

D.C. main supply in to an A.C. welding supply

A.C. main supply in to an A.C. welding supply

A.C. main supply in to an D.C. welding supply

D.C. main supply in to an D.C. welding supply

Answer: A.C. main supply in to an A.C. welding supply

Explanation:


3. While gas cutting, the nozzle should __________ ?

touch the work

be 2 mm away from work

be 5 mm away from work

be 10 mm away from work

Answer: be 5 mm away from work

Explanation:


4. In an acetylene cylinder the acetylene is devolved in ?

mercury

acetone

water

silver oxide

Answer: acetone

Explanation:


5. The electrode size refers to ?

diameter of its core wire

diameter of electrode

thickness of flux coating

length of electrode

Answer: diameter of its core wire

Explanation:


6. The function of the central hole in the tip of the cutting blow pipe is ?

supply oxygen for preheating

supply acetylene for preheating

supply oxygen for cutting

supply acetylene for cutting

Answer: supply oxygen for cutting

Explanation:


7. Which one of the following types of soldering iron is used for straight s oldering points ?

hatching type soldering iron

square point soldering iron

straight soldering iron

none of the above

Answer: hatching type soldering iron

Explanation:


8. It is necessary to remove the flow residues in gas welding ?

to get a good look

to provide protection to the welder

to prevent drilling

to prevent from rust

Answer: to prevent from rust

Explanation:


9. The reverse polarity in the arc welding is _______ ?

when electrode cable connected to positive terminal

when electrode cable is connected to negative terminal

when electrode cable connected to neutral terminal

none of the above

Answer: when electrode cable connected to positive terminal

Explanation:


10. Brazing is used to join Which two metals ?

brass to brass

aluminium to aluminium

steel to steel

copper to copper

Answer: steel to steel

Explanation: