| Post Name | JUNIOR INSTRUCTOR (WELDER) - Industrial Training |
|---|---|
| Question Paper Code | 157/2025 |
| Category Code | 013/2025 |
| Date of Test | 25 November 2025 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which of the following term do not indicate the grade of the file?
Answer
B. First cut
2
Match the following tools and their use :
Tools Uses
(p) Hand shield (1) To remove slag
(q) Chipping hammer (2) To check squareness
(r) Tongs (3) To hold hot jobs
(s) Try square (4) To protect eyes from uv rays
Answer
D. p-4, q-1, r-3, s-2
3
Cross section of chisel is :
Answer
D. Hexagonal
4
How much oxygen is required to oxidise one kilogram of iron?
Answer
B. 300 liters
5
Which fuel gas is used for under water cutting?
Answer
C. Hydrogen
6
Which one of the test is conducted by without electricity supply?
Answer
B. Gamma ray test
7
A test is conducted to know the tensile strength and ductility of weld is :
Answer
B. Tensile test
8
Based on the properties of different metals they are used for various applications which
metal does not allow X-rays to pass through?
Answer
C. Lead
9
Stethoscope test cames in :
Answer
D. Common non-destructive test
10
Each question is provided with four choices
Answer
D. having one correct answer. Choose
the correct answer and darken the bubble corresponding to the question number using Blue or
Black Ball-Point Pen in the OMR Answer Sheet.
11
The velocity of plasma arc cutting stream is :
Answer
B. 600 m/sec
12
The non-consumable electrode material used in plasma arc cutting other than
compressed air is :
Answer
B. 2% Thoriated tungsten
13
In the following statement which one is the advantages of hard facing?
Answer
D. Use of reconditioned wornout parts
14
Which defects are prevented by controlling of heat input technique?
Answer
C. Crack and distortion
15
Post heating is done after welding, the reason for post heating is to :
Answer
A. Reduce rate of cooling
16
Which of the following element is used to prevent weld decay of stainless steel?
Answer
A. Columbium
17
After the welding of aluminium fuel tanks, the fluxes are usually removed by :
Answer
A. using a solution of nitric acid and hydrofluoric acid
18
Stellite type filler metal is commonly used for :
Answer
C. Hard facing of metallic components
19
Which of the following filler rod material is suitable for the welding of wrought iron?
Answer
B. Copper coated mild steel
20
The normal temperature range of oxy-coal gas-flame is :
Answer
B. 1800 – 2200°C
21
When austenetic stainless steel is heated during gas welding, the chromium and carbon
will combine to form :
Answer
A. Chromium carbide
22
The melting point of aluminium oxide is :
Answer
C. 1930°C
23
Acid chromate bath is recommended for the removal of flux residue in :
Answer
D. Aluminium alloys
24
Oxygen cylinders are periodically cleaned by using :
Answer
B. Caustic solution
25
The third compartment of acetylene gas purifier contains :
Answer
C. Filter wool
26
The acetylene gas cylinder is made from :
Answer
B. Seamless drawn steel tube
27
The colour coding usually given to Argon-cylinder is :
Answer
B. Blue
28
Oxygen gas cylinders are usually tested with a water pressure of :
Answer
C. 225 bar
29
Which flame is commonly used for stelliting?
Answer
B. Carburising flame
30
The colour coding usually given to Hydrogen cylinder is :
Answer
C. Red
31
In DC welding machine 1/3 heat liberated in which terminal :
Answer
A. Negative terminal
32
In which polarity low hydrogen electrodes are used :
Answer
A. DC positive
33
The type of electrode which helps to get a weld without cracks :
Answer
A. Low hydrogen electrodes
34
The Method of welding heavy thick plates in vertical position is :
Answer
D. Electro slag welding
157/2025 6 A
35
Changing the position of the work on the welding table is the method of :
Answer
D. Control the arc blow
36
The substance which contains the flux prevent porosity and make the weld stronger :
Answer
D. Deoxidizers
37
The distance between the junction of the metals and the point where the weld metal
touches the base metal ‘toe’ is called:
Answer
C. Leg length
38
In this type of welding an arc is formed between a continuous, automatically fed,
metallic consumable electrode and the welding job under a thick pool of molten flux :
Answer
C. Electro slag welding
39
The distance between the junction of the metals and the midpoint on the line joining the
two toes is known as :
Answer
D. Throat thickness
40
Supplementary symbols on elementary symbols indicate the :
Answer
C. Type of weld surface
41
Which type of wire brush is used for cleaning nonferrous metals?
Answer
D. Stainless steel wire brush
42
In a welding rectifier cell which acts as a cathode :
Answer
A. Cadmium, bismuth and tin alloy film
43
A small weld deposited on the root side of butt or corner joint before welding :
Answer
B. Backing run
44
Identify one of the methods to balance the shrinkage force with another shrinkage force :
Answer
D. Divergence allowance
45
In this process the arc is formed between a tungsten electrode in an atmosphere of
hydrogen, nitrogen and argon gas :
Answer
A. Plasma arc welding
46
The surface formed by squaring off the root edge of the fusion face to avoid a sharp edge
at the root :
Answer
D. Root face
47
Standard length of an arc welding electrode is :
Answer
B. 350 mm or 450 mm
48
Which arc length is used for restarting the weld?
Answer
A. Long arc
49
As per IS : 814-1991, electrode coding, the letter ‘K’ indicates :
Answer
B. Effective electrode efficiency
50
In which polarity is cellulosic type electrodes are used?
Answer
C. DC Positive
51
What is the gun angle used in forehand or backhand welding technique in GMAW?
Answer
A. 10 - 15 degree
52
What is the colour code used to identify a CO2 Cylinder?
Answer
D. Black body with white neck
53
What is the main function of a gas diffuser in a MIG torch?
Answer
B. To make sure the shielding gas is delivered evenly and correctly to the nozzle
54
What is the voltage range for Globular Transfer in GMAW?
Answer
C. 23-27 V
55
In DIP transfer during MIG welding, what happens when the molten wire touches the
weld puddle?
Answer
B. The circuit is shorted, the arc is extinguished and the metal drop is
transferred
56
Which of the following could be a cause if it is difficult to start an arc and the arc is
unstable during GMAW?
Answer
D. Wrong polarity or poor working piece connection
57
Which gas can be used to minimize spatters loss in GMAW?
Answer
Question Cancelled
58
In GMAW process the CO2 is filled in the cylinder in the form of?
Answer
B. Liquid
59
Which type of drive roller is used for Flux core arc welding?
Answer
Question Cancelled
60
Which is the shielding gas mixture suitable for welding stainless steel using spray
transfer in GMAW?
Answer
A. Argon with 1-2% Oxygen
61
The distance between the end of the contact tube and the tip of the electrode in CO2
welding is known as :
Answer
A. Stick out
62
State the value of metal deposition efficiency achieved in the FCAW :
Answer
B. 80-86%
63
Which defects is likely to be caused if gas supply is independent in GMAW?
Answer
B. Porosity
64
In CO2 welding, when the welding current is 300-500 A what is the quantity of gas flow
that should be set in the shielding?
Answer
A. 15-18 L/min
65
In ER 70 S of GMAW, electrode specification as per AWS what does 70 represents :
Answer
B. Tensile strength
66
What is also referred as a GTAW?
Answer
A. Tig welding
67
What is the non-consumable electrode of high melting point used in Tig welding?
Answer
C. Tungsten electrode
68
What is the angle of electrode tip by setting DCEN for stainless steel welding by Tig
welding?
Answer
D. 60°
69
Which is the welding process that maintains electric arc between non consumable
tungsten electrode and the base metal?
Answer
D. TIG
70
What is the name of the defect in which the weld metal did not melt with base metal in
Tig process?
Answer
C. Lack of fusion
71
What is the purpose of inert gas used in Tig welding?
Answer
B. To protect the molten metal from the atmospheric contamination
72
What is the process of replacing the air in a pipe with argon gas that will not react with
the root of the weld?
Answer
B. Purging
73
What is the name of the part of Tig torch for holding tungsten electrode?
Answer
A. Collet
74
What is the purpose of high frequency unit in Tig welding?
Answer
D. To initiate the arc without touching the electrode on the base metal
75
What is the device used to show the volume of inert gas allowed to go to the welding
torch in Tig welding?
Answer
A. Flow meter
76
Which type tungsten electrode is suitable for welding of stainless steel by Tig process
with DC?
Answer
C. Thoriated tungsten electrode
77
Which electrode is used to produce the arc in GTAW process?
Answer
C. Tungsten electrode
78
Which will not be present on the weld bead due to use of shielding gas in Tig welding?
Answer
A. Slag
79
What is the defect caused by high current in tig welding?
Answer
C. Undercut
80
Why argon gas is used in welding of stainless steel welding in Tig welding process?
Answer
A. Inert gas protects the weld
81
Which welding machine is to be used for welding aluminium by Tig welding process?
Answer
A. AC welding machine
82
What is defect by tig welding if the current is too low?
Answer
D. Lack of fusion
83
What is the right about DCRP electrode Tig welding?
Answer
D. Weld circuit polarity is incorrect
84
Which process can easily weld thin metal?
Answer
B. Tig welding
85
How is the inert gas directed to flow over weld pool in Tig welding?
Answer
C. Through ceramic nozzle
86
Which of the welding process that uses the arc between a bare metal electrode and weld
pool?
Answer
B. Submerged arc welding
87
Which of the following statement/s are true related to submerged arc welding?
(i) In automatic submerged arc welding arc voltage, arc length only controlled in
automatically
(ii) In automatic submerged arc welding arc voltage, arc length, and speed of travel,
electrode feed controlled automatically
(iii) In semi automatic submerged arc welding arc voltage, arc length, and speed of
travel, electrode feed controlled manually
(iv) In semi automatic submerged arc welding arc length, flux feeding and electrode
feed are automatic but speed of travel is controlled by operator
Answer
D. Statement (ii), (iv) only correct
157/2025 12 A
88
In thermit welding thermit mixture consisting of :
Answer
C. About 5 parts of aluminium and 8 parts of iron oxide
89
Which of the following welding is commonly used to weld railway tracks?
Answer
A. Thermit welding
90
Which of the following statement is true related to thermit welding?
Answer
B. Thermit welding usually involves chemical reaction and it is exothermic
91
Electro slag welding is generally done in :
Answer
D. Flat position
92
Which of the following statements is/are correct related to Electro slag welding :
(i) Electro slag welding is generally done in vertical position and can be only weld very
thin plates
(ii) Electro slag welding is generally done in horizontal position and can be only weld
very thin plates
(iii) Electro slag welding is generally done in vertical position and can be only weld
heavy plates
(iv) Electro slag welding is generally done in overhead position and can be only weld
heavy plates
Answer
C. Statement (iii) only correct
93
LASER stands for :
Answer
C. Light Amplification by Stimulated Emission of Radiation
94
Which welding process requires vaccum for welding?
Answer
C. Electron beam welding
95
In Electron beam welding the following action takes place
Answer
A. Kinetic energy of the high speed electrons is converted into heat
96
In resistance welding heat (H) produced at the junction is calculated by
(where I = current, R = resistance, T = time) :
Answer
C. H = I² × R × T
97
The welding process that uses roller electrode is :
Answer
D. Seam welding
98
Which of the following welding process is not a resistance welding?
Answer
A. Electron beam welding
99
The welded part of the spot welding is known as :
Answer
A. Weld nugget
100
What kind of filler metal is used in friction welding?
Answer
D. No filler metal
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157/2025 14 A
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