| Post Name | REVISED -JUNIOR INSTRUCTOR (WELDER) - INDUSTRIAL TRAINING |
|---|---|
| Question Paper Code | 070/2021 |
| Category Code | 164/2018 |
| Date of Test | 30 July 2021 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The stub end of an electrode should normally be not more than
Answer
B. 10% of electrode
2
There are three pre-requisites for any fire or explosion to take place. Which one of
the following is not included in the three pre-requisites ?
Answer
B. Nitrogen
3
In welding procedure, the PQR is stands for
Answer
D. Procedure Qualification Record
4
Material difficult to be spot welded is
Answer
A. Copper
5
What is the name of fusion zone in spot welding ?
Answer
C. Nugget
6
In which process cutting is possible in all positions on location ?
Answer
C. Plasma arc cutting
7
The velocity of plasma arc cutting stream is
Answer
B. 600 m/sec.
8
In plasma arc welding, the working temperature is
Answer
B. 20000�C – 30000�C
9
Electron beam welding, the tungsten filament unit, electrons is heated in vacuum
chamber at
Answer
B. 2000�C
10
Each question is provided with four choices
Answer
A. ,
11
Which welding process is more suitable for joining dissimilar metals ?
Answer
C. Friction welding
12
Which gas is used for TIG welding of aluminium ?
Answer
B. Argon
13
Which welding is generally recommended for pipe to pipe or tube to tube joint ?
Answer
D. GTAW/TIG
14
Which gas have greater arc stability than with helium ?
Answer
B. Argon
15
In GTAW, the tungsten electrode fusion approximately at
Answer
C. 3380�C
16
In GTAW process, tungsten with 2% thorium electrode is marked with
Answer
A. Red colour
17
What is the purpose of high frequency unit in GTAW welding ?
Answer
D. To initiate the arc without touching the electrode on the base metal
18
In GTAW process, aluminium is welded by
Answer
B. AC power source
19
Nickel and titanium is only welded for
Answer
A. GTAW
20
What is the use of backing strips and backing bars while welding the product ?
Answer
D. To minimize the distortion and contraction
21
What is the thermit reaction time ?
Answer
D. 25 – 30 seconds
22
Thermit for welding electric connections consist of
Answer
D. Copper oxide and Aluminium
23
In which part of the electro slag, unit is used to deliver the electrode wire through the
guide tube to the molten flux ?
Answer
A. Wire feeder
24
The temperature of molten slag pool in electro slag welding is
Answer
B. 1650�C
25
In which welding process, the thicker steel sections can be welded in a single pass
in vertical position ?
Answer
D. Electro slag and electro gas welding
26
In SAW process, use of run on and run off pieces for starting and ending is to avoid
Answer
D. Formation of crater
27
What is the purpose of post-heating in certain welded jobs ?
Answer
C. To reduce hardness and brittleness
28
Pre-heating and post-heating is essential in welding of
Answer
A. Cast iron
29
Which kind of welding can be reduced the width of heat affected zone ?
Answer
A. SAW
30
If the weld metal melting completely through base metal, which resulting
Answer
C. Burn through
31
Which type of edge preparation is prepared to do for 25 mm plate in manual CO2
dip transfer ?
Answer
C. Double ‘v’
32
In FCAW, what is the percentage of metal deposition of efficiency ?
Answer
C. 80% – 86%
33
In GTAW process, the torch nozzle is made of
Answer
C. Ceramic
34
State the purpose of using a gas heater.
Answer
D. Prevent freezing of moisture present in the regulator
35
Which one of the following statement is correct in the selection of the wire electrode ?
Answer
D. Mechanical properties of weld metal
36
GMAW process 0.8 mm dia. electrode is mild steel welding spray arc transfer the
current and voltage range is
Answer
C. 150 – 265 Amps, 24 – 28 V
37
Which of the following is the only GMAW process parameter ?
Answer
B. Stick out
38
In GMAW process, the dip transfer voltage is
Answer
B. 16 – 22 V
39
In wire speed controls, the recommended range of wire speed is
Answer
A. 1 – 25 m/min
40
Which kind of process is more economical and less edge preparation ?
Answer
A. GMAW
41
In GMAW process, volts ampere curve and constant current type ampere drop
percentage is
Answer
C. 6.7%
42
At what percentage of oxygen can cause dizziness, unconsciousness or even death ?
Answer
C. Less than 18%
43
Mig welding of galvanized metal is extremely dangerous because it evaporate
Answer
B. Zinc oxide
44
In a nick break test, a saw cut depth is
Answer
B. 1.5 – 2 mm
45
Which one of the test is used to defect surface and sub-surface ?
Answer
D. Magnetic particle test
46
Which one is to check the contour of welds ?
Answer
B. Template
47
Name the tool which will avoid the damage and impression on the metal sheets.
Answer
D. Mallet
48
Which shade number of the filter glass is fitted in the helmet for MMAW ?
Answer
C. Shade number – 10
49
Which one of the following welding machine will supply alternating curved for welding ?
Answer
B. Transformer set
50
Open circuit voltage of welding machine is
Answer
C. 60 – 110 V
51
The unit of electric resistance is called as
Answer
B. Ohms
52
Weld metal deposited above the surface of the parent metal is called
Answer
D. Reinforcement
53
Which kind of angle used to prepare the single bevel in M.S. material for welding
purpose ?
Answer
C. 45�
54
Ratio of oxygen to acetylene for complete combustion is
Answer
D. 2.5 : 1
55
The pressure of acetylene gas for gas cutting a 10 mm M.S. plate is
Answer
B. 0.15 kgf/cm2
56
Identify the welding machine which is used to avoid arc blow.
Answer
C. Transformer
57
The angle formed between the line of the weld root and the horizontal reference plate is
Answer
A. Weld slope
58
The imaginary line passing through the weld centre lengthwise is known as
Answer
B. Axis of weld
59
Welding position is determined by
Answer
B. Axis and face of weld
60
Name the defect, the micro structure properties affected by welding heat.
Answer
D. Heat affected zone
61
Changing the direction of current flow in DC welding machine is
Answer
B. Polarity
62
The percentage of calcium and carbon in calcium carbide is
Answer
C. 62.5 : 37.5
63
What is the post-heating temperature for welding medium carbon steel plate ?
Answer
Question Cancelled
64
The percentage of carbon in acetylene gas is
Answer
D. 92.3%
65
Which type of valve is used in flashback arrestor ?
Answer
C. Non return valve
66
In which temperature liquid oxygen becomes solid ?
Answer
C. – 218.4�C
67
One kilogram of liquid oxygen produces
Answer
A. 750 litre of oxygen gas
68
What is capacity of acetylene cylinder ?
Answer
A. 3.5 m3 – 8.5 m3
69
Acetylene gas leakage is identified by
Answer
A. Soapy water
70
For what purpose of placing of wedge or an alignment clamp between plates ahead
of the weld ?
Answer
D. Divergence allowance
71
In rightward welding method of pipe ends bended in which angle can be done pipe
butt joint ?
Answer
Question Cancelled
72
Which cracks develop at the end of the weld joint ?
Answer
C. Crater crack
73
If more than one cylinder is connected in a system is called
Answer
C. Manifold system
74
Which types of pipe is used in DA manifold system ?
Answer
B. Steel pipe
75
The suitable flux for welding of stainless steel is
Answer
D. Zinc chloride and potassium dichromate
76
Which steps to be taken to avoid lack of fusion in gas welding ?
Answer
B. Weld with uniform speed
77
What is the coating factor for medium coated electrode ?
Answer
B. 1.4 to 1.5
78
Which electrode is used to root pass welding of high pressure pipes ?
Answer
D. Cellulosic
79
In which substance coated electrode can be used AC/DC reverse polarity ?
Answer
C. Titanium
80
Cast iron welded after performing the pre-heating range of temperature is
Answer
Question Cancelled
81
In which polarity, low hydrogen electrode is used ?
Answer
C. DC reverse
82
In 3 mm thickness of high carbon steel, which diameter of filler rod can be used ?
Answer
D. 3 mm diameter
83
Which alloying element increases hardness and toughness ?
Answer
Question Cancelled
84
The major problem in welding stainless steel is
Answer
C. Poor thermal conduction
85
Which type of filler rod is to be selected to avoid weld decay in stainless steel welding ?
Answer
A. Columbium based
86
Which flame is suitable for brass welding ?
Answer
D. Oxidizing flame
87
The divergence allowance for gas welding of 300 mm long copper butt joint is
Answer
B. 3 to 4 mm
88
Which kind of welding process can be joint by dissimilar metals ?
Answer
A. Bronze welding of copper
89
Melting point of aluminium oxide is
Answer
D. 1930�C
90
Which of the following nozzle size is selected for 3 mm thickness aluminium and its
alloy ?
Answer
B. 5
91
Comparing to welding electrode, gouging electrode needs
Answer
D. 20 – 50% higher current
92
Which type of cast iron is very hard and brittle and is not weldable, and also not easily
machinable ?
Answer
D. White cast iron
93
The cast iron material has often post-heating which kind of cooling to be done ?
Answer
C. Sand
94
Which is not true about calcium carbide ?
Answer
D. It is soluble in kerosene oil
95
In a gas cut plate, the cut shows grooves and has deep drag lines. This is due to
Answer
A. Tip too close to the cut surface
96
What percentage of chromium and nickel are usually present in stainless steel ?
Answer
D. 18% Chromium, 8% Nickel
97
Which type of welding source is preferred for welding of non-ferrous metals ?
Answer
Question Cancelled
98
In resistance welding, if the current is doubled, the heating effect becomes
Answer
B. Four times
99
The presence of oxygen can reduce
Answer
Question Cancelled
100
Which of the following elements is added to steel to increase its resistance to corrosion
in environments like seawater ?
Answer
B. Copper
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