WELDER THEORY SEMESTER - 1
JULY 2018
JULY 2018
Which one of the following is not the cost due to an accident?
a) Cost due to damage to machine, tools, material and property
b) Cost of lost time of the injured person
c) Cost of compensation and medical aid
d) Cost due to increase in production
Answer: d) Cost due to increase in production
itiquestion.blogspot.com
The welding machine, which is used to convert AC
welding supply to DC welding supply is ……
a) Motor generator set
b) Engine generator set
c) Rectifier set
d) Welding transformer
Answer: c) Rectifier set
In gas cutting, if too little cutting oxygen is supplied ……
a) The metal will be cooled down
b) The kerf will be narrow
c) The kerf will be wide
d) The metal will fail to cut completely
Answer: d) The metal will fail to cut completely
itiquestion.blogspot.com
Neutral flame in gas welding contains ……….
a) Oxygen & Actylene in equal proportion
b) More oxygen than Acetylene
c) Less oxygen than Acetylene
d) None of these
Answer: a) Oxygen & Actylene in equal proportion
The chief alloying elements of stainless steel are …..
a) Chromium and nickel
b) Chromium and tungsten
c) Nickel and vanadium
d) Nickel and tungsten
Answer: a) Chromium and nickel
The safe way of working is ……..
a) An effective and right way of working
b) An ancient way of working
c) A way of handling the work in a hurry
d) A way of normal working
Answer: a) An effective and right way of working
itiquestion.blogspot.com
In a transformer, if the number of turns in
the secondary winding is twice that in
primary winding, the secondary voltage will be …..
a) Half that of primary voltage
b) Same as the of primary voltage
c) Twice the primary voltage
d) Four times the primary voltage
Answer: c) Twice the primary voltage
Increase of carbon content in steel results in …….
a) Increase in hardness
b) Increase in malleability
c) Increase in ductility
d) Increase in strength
Answer: a) Increase in hardness
itiquestion.blogspot.com
In case of arc welding, one should protect his eyes by using …..
a) Dark glass screen
b) Sun goggles
c) Mask
d) Clear glasses
Answer: a) Dark glass screen
Which one of the following properties is most
essential for the metals in the process of
casting, welding, brazing and soldering?
a) Fusibility
b) Malleability
c) Tenacity
d) Plasticity
Answer: a) Fusibility
The electrode size refers to …….
a) Diameter of its core wire
b) Diameter (overall) of electrode
c) Thickness of flux coating
d) Length of electrode
Answer: a) Diameter of its core wire
The size of the cutting nozzle used in
Oxy-acetylene cutting process depends mainly on ….
a) Thickness of metal to be cut
b) Purity of oxygen
c) Duration of cut
d) Type of cutting blowpipe
Answer: a) Thickness of metal to be cut
itiquestion.blogspot.com
Cast iron is used for manufacturing machine beds because -
a) It can resist more compressive stress
b) It is heavy in weight
c) It is a cheaper metal
d) It is a brittle metal
Answer: a) It can resist more compressive stress
In a transformer, the winding to which electric
supply is given as input is called
a) Primery winding
b) Secondary winding
c) Main winding
d) Auxiliary winding
Answer: a) Primary winding
itiquestion.blogspot.com
Which one of the following is the type of
transformer used in arc welding?
a) Step down
b) Step up
c) One-to-one
d) Capable of increasing supply voltage
Answer: a) Step down
itiquestion.blogspot.com
Which is the cause of electric fire?
a) Loose connection
b) Over loading the wires
c) Electric short circuit
d) All of these
Answer: a) Loose connection
If the blowpipe is moved to and fro frequently
while cutting the kerf will ….
a) Be more
b) Of correct size
c) Be less
d) Not be affected
Answer: a) Be more
In the process of soldering, you have noticed
that solder is not sticking sufficiently heated
copper soldering bit when rubbed over solder bar.
What step do you take to overcome the
problem?
a) Pre- heat the solder
b) Clean the bit thoroughly
c) Change the soldering bit shape
d) Rub the bit over solder for longer period
Answer: b) Clean the bit thoroughly
itiquestion.blogspot.com
According to ohms law ….
a) V = I/R
b) R = VI
c) I = V/R
d) I = VR
Answer: c) I = V/R
No current flow in ……
a) Closed circuit
b) Open circuit
c) Short circuit
d) Parallel circuit
Answer: b) Open circuit
Which one of the following is a chemical property of metal?
a) Corrosiveness
b) Conductivity
c) Hardness
d) Elasticity
Answer: a) Corrosiveness
itiquestion.blogspot.com
Which type of fire extinguisher is used in a welding shop?
a) Foam type extinguisher
b) Dry powder extinguisher
c) C02 extinguisher
d) Halon extinguisher
Answer: c) C02 extinguisher
The arc utilized in electric arc welding is a …….
a) High voltage, high current discharge
b) Low voltage, low current discharge
c) Low voltage, high current discharge
d) High voltage, low current discharge
Answer: c) Low voltage, high current discharge
itiquestion.blogspot.com
The position in which it is easiest to weld is -
a) Flat
b) Vertical
c) Horizontal
d) Overhead
Answer: a) Flat
The ability of a metal to be drawn into wire is a measure of its
a) Ductility
b) Toughness
c) Malleability
d) Hardness
Answer: a) Ductility
The electrodes are manufactured in two standard lengths namely ….
a) 350 mm and 250 mm
b) 350 mm and 450 mm
c) 400 mm and 500 mm
d) 12"and 10"
Answer: 350 mm and 450 mm
In an acetylene cylinder, the acetylene is dissolved in ….
a) Water
b) Carbon Dioxide
c) Acetone
d) Mercury
Answer: c) Acetone
itiquestion.blogspot.com
Which fuel gas is used for cutting deep under water?
a) Acetylene
b) Hydrogen
c)LPG
d) Methane
Answer: b) Hydrogen
Acetylene is a fuel gas for gas cutting & welding composed of-
a) 7.7 of carbon & 92.3 % of hydrogen
b) 92,3% carbon & 7.7 % hydrogen
c) 100% carbon
d) 50% carbon & 50% hydrogen
Answer: b) 92,3% carbon & 7.7 % hydrogen
Match the following tools and their use -
TOOLS :-
p. Hand shield, q, chipping hammer r, Tongs s. Try square
USES:-
1. To remove slag 2. To check squareness 3. To hold hot jobs
4 to protect eyes from uv rays
a) p4, q-2, r-3, s-4
b) p-2. q-1, r-3 s-4
c) p-4, q-1, r- 2 s- 3
d) p-4 q-1 r-3 s-2
Answer: d) p-4 q-1 r-3 s-2
What should never be used on gas cylinders, regulators and holes,
a) Wrenches
b) Teflon tapes
c) Leak detectors
d) Oil
Answer: d) Oil
itiquestion.blogspot.com
While gas cutting the nozzle should?
a) Almost touch the work
b) Be 1.0 mm away from work
c) Be 2 mm away from work
d) Be 5 mm away from work
Answer: b) Be 1.0 mm away from work
What purpose is served by flux during soldering?
a) It cleans the surface to be soldered
b) It lowers the melting point of the solder
c) It makes the flow of solder in the joint easy
d) It does all of above
Answer: d) It does all of above
A cylinder while contains acetylene will be painted …
a) Brown
b) Black
c) Blue
d) Maroon
Answer: d) Maroon
Match the welding terms with their definitions ….
1 Parent metal 2 Filler metal 3 Deposited metal
with that of its definition
p. Metal which becomes a part of the joint ,
q. Metal to be joined r. Metal added during welding
a) 1-p, 2-q and 3-r
b) l-q9 2-p and 3-r
c) 1-r, 2-q and 3-p
d) 1-q, 2-r and 3-p
Answer: d) 1-q, 2-r and 3-p
itiquestion.blogspot.com
Cast iron contains two elements, which make it difficult
to cut it by gas cutting. What are these elements?
a) Sulphur and phosphorous
b) Silicon and graphite
c) Graphite and phosphorous
d) Silicon and sulphur
Answer: b) Silicon and graphite
In DC welding heat distribution is possible between
electrode and the base metal due to the change of polarity.
The distribution of heat is -
a) Positive 2/3 and negative 1/3
b) Positive 1 /3 and negative 2/3
c) Positive 3/4 and negative 1/4
d) Positive 1/4 and negative 3/4
WELDER SEMESTER - 1 THEORY JULY 2018
Which one of the following is not the cost due to an accident?
a) Cost due to damage to machine, tools, material and property
b) Cost of lost time of the injured person
c) Cost of compensation and medical aid
d) Cost due to increase in production
Answer: d) Cost due to increase in production
The welding machine, which is used to convert AC
welding supply to DC welding supply is ……
a) Motor generator set
b) Engine generator set
c) Rectifier set
d) Welding transformer
Answer: c) Rectifier set
In gas cutting, if too little cutting oxygen is supplied ……
a) The metal will be cooled down
b) The kerf will be narrow
c) The kerf will be wide
d) The metal will fail to cut completely
Answer: d) The metal will fail to cut completely
Neutral flame in gas welding contains ……….
a) Oxygen & Actylene in equal proportion
b) More oxygen than Acetylene
c) Less oxygen than Acetylene
d) None of these
Answer: a) Oxygen & Actylene in equal proportion
The chief alloying elements of stainless steel are …..
a) Chromium and nickel
b) Chromium and tungsten
c) Nickel and vanadium
d) Nickel and tungsten
Answer: a) Chromium and nickel
The safe way of working is ……..
a) An effective and right way of working
b) An ancient way of working
c) A way of handling the work in a hurry
d) A way of normal working
Answer: a) An effective and right way of working
In a transformer, if the number of turns in
the secondary winding is twice that in
primary winding, the secondary voltage will be …..
a) Half that of primary voltage
b) Same as the of primary voltage
c) Twice the primary voltage
d) Four times the primary voltage
Answer: c) Twice the primary voltage
Increase of carbon content in steel results in …….
a) Increase in hardness
b) Increase in malleability
c) Increase in ductility
d) Increase in strength
Answer: a) Increase in hardness
In case of arc welding, one should protect his eyes by using …..
a) Dark glass screen
b) Sun goggles
c) Mask
d) Clear glasses
Answer: a) Dark glass screen
Which one of the following properties is most
essential for the metals in the process of
casting, welding, brazing and soldering?
a) Fusibility
b) Malleability
c) Tenacity
d) Plasticity
Answer: a) Fusibility
The electrode size refers to …….
a) Diameter of its core wire
b) Diameter (overall) of electrode
c) Thickness of flux coating
d) Length of electrode
Answer: a) Diameter of its core wire
The size of the cutting nozzle used in
Oxy-acetylene cutting process depends mainly on ….
a) Thickness of metal to be cut
b) Purity of oxygen
c) Duration of cut
d) Type of cutting blowpipe
Answer: a) Thickness of metal to be cut
Cast iron is used for manufacturing machine beds because -
a) It can resist more compressive stress
b) It is heavy in weight
c) It is a cheaper metal
d) It is a brittle metal
Answer: a) It can resist more compressive stress
In a transformer, the winding to which electric
supply is given as input is called
a) Primery winding
b) Secondary winding
c) Main winding
d) Auxiliary winding
Answer: a) Primary winding
Which one of the following is the type of
transformer used in arc welding?
a) Step down
b) Step up
c) One-to-one
d) Capable of increasing supply voltage
Answer: a) Step down
Which is the cause of electric fire?
a) Loose connection
b) Over loading the wires
c) Electric short circuit
d) All of these
Answer: a) Loose connection
If the blowpipe is moved to and fro frequently
while cutting the kerf will ….
a) Be more
b) Of correct size
c) Be less
d) Not be affected
Answer: a) Be more
In the process of soldering, you have noticed
that solder is not sticking sufficiently heated
copper soldering bit when rubbed over solder bar.
What step do you take to overcome the
problem?
a) Pre- heat the solder
b) Clean the bit thoroughly
c) Change the soldering bit shape
d) Rub the bit over solder for longer period
Answer: b) Clean the bit thoroughly
According to ohms law ….
a) V = I/R
b) R = VI
c) I = V/R
d) I = VR
Answer: c) I = V/R
No current flow in ……
a) Closed circuit
b) Open circuit
c) Short circuit
d) Parallel circuit
Answer: b) Open circuit
Which one of the following is a chemical property of metal?
a) Corrosiveness
b) Conductivity
c) Hardness
d) Elasticity
Answer: a) Corrosiveness
Which type of fire extinguisher is used in a welding shop?
a) Foam type extinguisher
b) Dry powder extinguisher
c) C02 extinguisher
d) Halon extinguisher
Answer: c) C02 extinguisher
The arc utilized in electric arc welding is a …….
a) High voltage, high current discharge
b) Low voltage, low current discharge
c) Low voltage, high current discharge
d) High voltage, low current discharge
Answer: c) Low voltage, high current discharge
The position in which it is easiest to weld is -
a) Flat
b) Vertical
c) Horizontal
d) Overhead
Answer: a) Flat
The ability of a metal to be drawn into wire is a measure of its
a) Ductility
b) Toughness
c) Malleability
d) Hardness
Answer: a) Ductility
The electrodes are manufactured in two standard lengths namely ….
a) 350 mm and 250 mm
b) 350 mm and 450 mm
c) 400 mm and 500 mm
d) 12"and 10"
Answer: 350 mm and 450 mm
In an acetylene cylinder, the acetylene is dissolved in ….
a) Water
b) Carbon Dioxide
c) Acetone
d) Mercury
Answer: c) Acetone
Which fuel gas is used for cutting deep under water?
a) Acetylene
b) Hydrogen
c)LPG
d) Methane
Answer: b) Hydrogen
Acetylene is a fuel gas for gas cutting & welding composed of-
a) 7.7 of carbon & 92.3 % of hydrogen
b) 92,3% carbon & 7.7 % hydrogen
c) 100% carbon
d) 50% carbon & 50% hydrogen
Answer: b) 92,3% carbon & 7.7 % hydrogen
Match the following tools and their use -
TOOLS :-
p. Hand shield, q, chipping hammer r, Tongs s. Try square
USES:-
1. To remove slag 2. To check squareness 3. To hold hot jobs
4 to protect eyes from uv rays
a) p4, q-2, r-3, s-4
b) p-2. q-1, r-3 s-4
c) p-4, q-1, r- 2 s- 3
d) p-4 q-1 r-3 s-2
Answer: d) p-4 q-1 r-3 s-2
What should never be used on gas cylinders, regulators and holes,
a) Wrenches
b) Teflon tapes
c) Leak detectors
d) Oil
Answer: d) Oil
While gas cutting the nozzle should?
a) Almost touch the work
b) Be 1.0 mm away from work
c) Be 2 mm away from work
d) Be 5 mm away from work
Answer: b) Be 1.0 mm away from work
What purpose is served by flux during soldering?
a) It cleans the surface to be soldered
b) It lowers the melting point of the solder
c) It makes the flow of solder in the joint easy
d) It does all of above
Answer: d) It does all of above
A cylinder while contains acetylene will be painted …
a) Brown
b) Black
c) Blue
d) Maroon
Answer: d) Maroon
Match the welding terms with their definitions ….
1 Parent metal 2 Filler metal 3 Deposited metal
with that of its definition
p. Metal which becomes a part of the joint ,
q. Metal to be joined r. Metal added during welding
a) 1-p, 2-q and 3-r
b) l-q9 2-p and 3-r
c) 1-r, 2-q and 3-p
d) 1-q, 2-r and 3-p
Answer: d) 1-q, 2-r and 3-p
Cast iron contains two elements, which make it difficult
to cut it by gas cutting. What are these elements?
a) Sulphur and phosphorous
b) Silicon and graphite
c) Graphite and phosphorous
d) Silicon and sulphur
Answer: b) Silicon and graphite
In DC welding heat distribution is possible between
electrode and the base metal due to the change of polarity.
The distribution of heat is -
a) Positive 2/3 and negative 1/3
b) Positive 1 /3 and negative 2/3
c) Positive 3/4 and negative 1/4
d) Positive 1/4 and negative 3/4
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