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117 questions · page 2 of 6. Answer in your head first, then check the solution.

📘 ESAS Mock Board Exam
TypeAll 117Problem solvingObjective 117
DifficultyAll 117Easy 117MediumHard
#21📘 EE Pocket Reviewer RojasEasy
What is the ultimate purpose of using electrode coating?
ATo prevent atmospheric contamination
BTo cleanse the base metal
CTo improve bead quality
DTo increase the welding current
#22📘 EE Pocket Reviewer RojasEasy
The tips of the electrodes for spot welding is made from which of the following materials?
AMica
BPorcelain
CCarbon
DCopper alloy
#23📘 EE Pocket Reviewer RojasEasy
In arc welding once the arc is struck, what is the voltage required to maintain the arc?
AAbout 20 to 30
BAbout 100 to 120
CAbout 200 to 220
DAbout 500 to 1000
#24📘 EE Pocket Reviewer RojasEasy
In a welded joint, poor fusion is due to which of the following?
AImproper current
BHigh welding speed
CExcessive arc length
DUncleaned metal surface
#25📘 EE Pocket Reviewer RojasEasy
What type of transformer is used in resistance welding?
AStep-down (high current) transformer
BStep-up transformer
CCurrent transformer
DIsolation transformer
#26📘 EE Pocket Reviewer RojasEasy
In resistance welder, the pneumatic pressure is applied during which of the following periods?
ASqueeze time
BWeld time
CSqueeze and weld time
DSqueeze, weld and hold time
#27📘 EE Pocket Reviewer RojasEasy
The electric arc welding process produces temperatures up to how much?
A1000°C
B1500°C
C3500°C
D5500°C
#28📘 EE Pocket Reviewer RojasEasy
In argon arc welding, the electrode is made of what material?
ASteel
BTungsten
CCopper
DCarbon
#29📘 EE Pocket Reviewer RojasEasy
During resistance welding, the heat produced in the joint is proportional to which one?
A\(I^2R\)
BkVA
CCurrent
DVoltage
#30📘 EE Pocket Reviewer RojasEasy
Electric resistance seam welding uses which type of electrodes?
APointed type
BFlat type
CDisc type
DHexagonal type
#31📘 EE Pocket Reviewer RojasEasy
Electrodes are not consumed in which of the following welding methods?
ATIG welding
BAC arc welding
CDC arc welding
DGas welding
#32📘 EE Pocket Reviewer RojasEasy
In comparison to TIG welding, which one is true about MIG welding?
AIt uses consumable electrodes
BIt requires no post-weld cleansing
CIt provides complete protection from atmospheric contamination
DIt requires no flux
#33📘 EE Pocket Reviewer RojasEasy
In welding, the eyes of the welder must be protected from which of the following type of radiations?
AUltra violet radiations
BInfrared radiations
CSolar radiations
DBoth A and B
#34📘 EE Pocket Reviewer RojasEasy
Increasing heat due to shorter arc is harmful on which of the following reasons?
AExcessive porosity
BUnder cutting of base material
CBurn through
DAll of these
#35📘 EE Pocket Reviewer RojasEasy
In arc welding, the arc can be produce by what type of current?
AAC current only
BDC current only
CEither AC or DC currents
DCombination of AC and DC currents
#36📘 EE Pocket Reviewer RojasEasy
What type of transformer is used in arc welding?
AStep-up transformer
BStep-down transformer
CFrequency changing transformer
DCurrent transformer
#37📘 EE Pocket Reviewer RojasEasy
In arc welding, the major personal hazards are which of the following?
AFlying sparks
BWeld spatter
CHarmful infrared and ultraviolet rays
DAll of these
#38📘 EE Pocket Reviewer RojasEasy
In which of the following applications is the resistance welding not usable?
ADielectrics
BFerrous materials
CNon-ferrous materials
DAll of these
#39📘 EE Pocket Reviewer RojasEasy
Which one is a reason why aluminum is difficult to weld?
AIt has an oxide coating
BIt conducts away heat very rapidly
CBoth A and B
DNone of these
#40📘 EE Pocket Reviewer RojasEasy
In gas welding, what are the gases used?
AAcetylene and oxygen
BOxygen and nitrogen
CArgon and helium
DHelium and carbon dioxide

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