Practice Quiz On Electric Welding
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- 1.The basic electrical requirement in arc welding is that there should be
- A.
Coated electrodes
- B.
High open-circuit voltage
- C.
No arc blow
- D.
Dc power supply
- 2.Welding is not done directly from the supply mains because
- A.
It is customary to use welding machines
- B.
Its voltage is too high
- C.
Its voltage keeps fluctuating
- D.
It is impractical to draw heavy currents
- 3.AC welding machine cannot be used for ____ welding.
- A.
MIG
- B.
Atomic hydrogen
- C.
Resistance
- D.
Submerged arc
- 4.In electrical welding, arc blow can be avoided by
- A.
Using bare electrodes
- B.
Welding away from earth ground connection
- C.
Using ac welding machines
- D.
Increasing arc length
- 5.In DCSP welding
- A.
Electrode is the hottest
- B.
Workpiece is relatively cooler
- C.
Base metal penetration is deep
- D.
Heavily-coated electrodes are used
- 6.Overhead welding position is thought to be the most ______.
- A.
Hazardous
- B.
Difficult
- C.
Economical
- D.
Useful
- 7.The ultimate aim of using electrode coating is to
- A.
Prevent atmospheric contamination
- B.
Improve bead quality
- C.
Cleanse the base metal
- D.
Provide shieding to weld pool
- 8.In electrode-positive welding, _____ of the total heat is produced at the electrode.
- A.
One-third
- B.
Two-third
- C.
One-half
- D.
One-fourth
- 9.Submerged arc process is characterized by
- A.
Deep penetration
- B.
High welding current
- C.
Exceptionally smooth beads
- D.
All of the above
- 10.The major disadvantage of carbon arc welding is that
- A.
There is occurence of blow holes
- B.
Electrodes are consumed fast
- C.
Separate filler rod is needed
- D.
Bare electrodes are necessary
- 11.. In atomic hydrogen welding, electrodes are long lived because
- A.
Two are used at a time
- B.
Arc is in the shape of a fan
- C.
Ac supply is used
- D.
it is a non-pressure process
- 12.Unlike TIG welding, MIG welding
- A.
Requires no flux
- B.
Uses consumable electrodes
- C.
Provides complete protection from atmospheric contamination
- D.
Requires no post-weld cleansing
- 13.The major power supply used in MIG welding is
- A.
Ac supply
- B.
DCSP
- C.
Electrode-negative
- D.
DCRP
- 14.MIG welding process is becoming increasingly popular in welding industry mainly because of
- A.
Its easy operation
- B.
Its high metal deposit rate
- C.
Its use in both ferrous and non-ferrous metals
- D.
Both its easy operation and its high metal deposit rate
- 15.A weld bead of wineglass design is produced in _____ welding.
- A.
Plasma arc
- B.
Laser
- C.
Electron beam
- D.
MAG
- 16.Spot welding process basically depends on
- A.
Ohmic resistance
- B.
Generation of heat
- C.
Application of forging pressure
- D.
Generation of heat and application of forging pressure
- 17.Electric resistance seam welding uses _____ electrodes.
- A.
Pointed
- B.
Disc
- C.
Flat
- D.
Domed
- 18.Projection welding can be regarded as a mass production form of ______ welding.
- A.
Seam
- B.
Butt
- C.
Spot
- D.
Upset
- 19.In the process of electroslag welding, theoretically there is no upper limit to the
- A.
Thickness of weld lead
- B.
Rate of metal deposit
- C.
Slag bath-temperature
- D.
Rate of slag consumption
- 20.High temperature metals like columbium can be easily welded by _____ welding.
- A.
Flash
- B.
MIG
- C.
TIG
- D.
Electron beam
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