Electrical Welding MCQ Question and Answer
1.During resistance welding heat produced at the joint is proportional to
- Asquare of current x resistance
- BkVA
- CCurrent
- DVoltage
2.The metal surfaces for electrical resistance welding must be
- ALubricated
- BCleaned
- CMoistened
- DRough
3.In a welded joint poor fusion is due to which of the following?
- AImproper current
- BHigh welding speed
- CUncleaned metal surface
- DLack of flux
4.For arc welding, DC is produced by which of the following?
- AMotor-generator set
- BTungsten alloy
- CStainless steel alloy
- DNone of the above
5.Which welding process uses consumable electrodes?
- ATIG
- BMIG
- CLaser
- DAll of the above
6.Which of the following equipment is generally used for arc welding?
- ASingle phase alternator
- BTwo phase alternator
- CThree phase alternator
- DTransformer
7.Which of the following is not an inert gas?
- AArgon
- BCarbon dioxide
- CHelium
- DAll of the above
8.Electronic components are joined by which of the following methods?
- ABrazing
- BSoldering
- CSeam welding
- DSpot welding
9.Resistance welding cannot be used for
- ADielectrics
- BFerrous materials
- CNon-Ferrous materials
- DAny of the above
10.Electric arc welding process produces temperature up to
- A1000 degree celsius
- B1500 degree celsius
- C3500 degree celsius
- D5550 degree celsius
11.Increased heat due to shorter arc is harmful on account of
- AUnder-cutting of base material
- BBurn through
- CExcessive porosity
- DAll of the above
12.Arc blow results in which of the following?
- ANon-uniform weld beads
- BShallow weld puddle giving rise to weak weld
- CSplashing out of metal from weld puddle
- DAll of the above defects
13.In seam welding
- AThe work piece is fixed and disc electrodes move
- BThe work piece moves but rotating electrodes are fixed
- CAny of the above
- DNone of the these
14.In arc welding major personal hazards are
- AFlying sparks
- BWeld spatter
- CHarmful infrared and ultra-violet rays from the arc
- DAll of the above
15.Seam welding is a
- AContinuous spot welding process
- BMulti-spot welding process
- CArc welding process
- DProcess used for joining round bars
16.In spot welding composition and thickness of the base metal secedes
- AThe amount of squeeze pressure
- BHold time
- CThe amount of weld current
- DAll above
17.Helium produces which of the following?
- ADeeper penetration
- BFaster welding speeds
- CNarrower heat affected zone in base metal
- DAll of the above
18.Due to which of the following reasons aluminium is difficult to weld?
- AIt has an oxide coating
- BIt conducts away heat very rapidly
- CBoth (a) and (b)
- DNone of the above
19.Welding leads have
- AHigh flexibility
- BHigh current handling capacity
- CBoth (a) and (b)
- DNone of the above