Semi Skilled Jobs Selection for ITI Fitter, Machinist, Welder, Fitter Electronics, Electrician, Blacksmith, Examiner, Painter in Heavy Vehicles Factory, Avadi will be made Strictly Based on the Merit Position drawn from the Written Examination & Personal Interview of the candidates. Heavy Vehicles Factory, Avadi also warned candidates to avoid any unscrupulous elements who may assure appointment in HVF, Avadi by seeking bribe in cash or in kind or any other inducement, and are advised not to fall in their trap.
(2005 Model Theory Q & A for Welder)
QUESTION PAPER
Subject: Welding Code: 6.00 / 121
Sr. No.: .............................................. Roll No.: ..........................
Signature of the Invigilator ...............................................
--------------------------------------------------------------------------------------------------
Date: 12.04.2005 Duration: 2 Hours
Time: 09:00 Hrs. to 11:00 Hrs. Max. Marks: 120
--------------------------------------------------------------------------------------------------
Instructions: Please read the following instructions carefully before writing your answers:
1) All Questions are compulsory.
2) Each Questions carries 1 mark.
3) There are four alternatives - (A), (B), (C), (D) given against each question out of which only one is the most appropriate answer. If (A) is correct, round on the correct alternative like (A) .
4) If a question is answered wrongly or more than one answers are marked, 0.25 marks will be deducted for each such question.
4) No sheet from the Question Paper / Answer Book should be detached.
5) Please DO NOT repeat DO NOT write your name anywhere on the Question Paper.
--------------------------------------------------------------------------------------------------
1. Welding metallurgy is the study of metallurgy pertaining to?
A.Welding processes
B.Welding techniques
C.Both A & B
D.None of these
Ans: C
2.A projection weld is a type of?
A.Resistance weld
B.Arc weld
C.Gas weld
D.Fillet weld
Ans: A
3.Armoured tanks are made of?
A.Armoured steel
B.Mild steel
C.Tor steel
D.Carbon steel
Ans: A
4.Armour steel is having tensile strength around?
A.50 to 60 kg/mm square
B.60 to 70 kg/mm square
C.70 to 80 kg/mm square
D.80 to 90 kg/mm square
Ans: C
5.The procedure for welding steel castins are conformed to?
A.ISI 1030-1962
B.ISI 1030-1961
C.ISI 1762-1961
D.None of these
Ans: A
6.Which effect become more pronounced with increasing frequency?
A.Skin effect
B.Proximity effect
C.Current effect
D.Frequency effect
Ans: C
7. Welding metallurgy is concerned with?
A.Melting of electrode
B.Base metal
C.Slag metal
D.All above
Ans: D
8.These weld symbols have no arrow-side or other-side significance?
A.Projection or seam weld
B.Back or backing weld
C.Surface or groove weld
D.Flash and upset weld
Ans: D
9. Welding mellurgy is concerned with?
A.Gas metal reaction
B.Surface phenomena
C.Solid state reactions
D.All above
Ans: D
10.A back or backing weld is a type of?
A.Groove weld
B.Resistance weld
C.Arc and gas weld
D.Upset weld
Ans: C
11. The electrodes which have a coating of oxides of iron and manganese and silicates are called?
A.Basic electrodes
B.Acidic electrodes
C.Chemical electrodes
D.None of these
Ans: B
12.This symbol indicates a surface to be built up?
A.Groove weld
B.Surface weld
C.Corner joint
D.Lap joint
Ans: B
13.The recrystallised weld metal has?
A.Maximum ductility
B.Crack resistance
C.Both A & B
D. None of these
Ans: C
14.Welding drawings are a special type of this kind of drawing?
A.Symbol
B.Perspective
C.Assembly
D.Isometric
Ans: C
15.Weldability depends?
A.Upon the process intended
B.On the service conditions intended
C.Both A & B
D. None of these
Ans: C
16.Which of the following is one of the basic types of welded joints?
A.T-joint
B.Rear joint
C.Angle joint
D.Groove joint
Ans: A
17.The changes takes place in Heat affected zone due to?
A.Heat
B.Pressure
C.Weather
D.None of these
Ans: A
18.The corrosion resistance of welded joints influenced by?
A.Chemical coposition of weld metal
B.Chemical composition of parent metal
C.welding process employed
D.All above
Ans: D
19.Corrosion resistance of welded joints is effected due to?
A.Parent metal thickness
B.Number of passes
C.Arc current
D.Speed of weld
Ans: E
20.The strongest constituent of steel is?
A.Ferrite
B.Peralite
C.Cementite
D.Austenite
Ans: B
21.The tensile strength of Peralite is?
A.18 tons per square inch
B.56 tons per square inch
C.65 tons per square inch
D.None of these
Ans: B
22.Specification for 1.5% manganese steel castins has been explained in?
A.ISI 2708-1964
B.ISI 1030-1962
C.ISI 1762-1961
D.None of these
Ans: A
23.High frequency current in metal conductors tends to flow at the surface of the metal. This is called?
A.Skin effect
B.Proximity effect
C.Current effect
D.Frequency effect
Ans: A
24.Electric Arc was first developed in the year?
A.1801
B.1810
C.1081
D.1800
Ans: A
25.Minimum voltage of direct current for establishing an arc is:
A.400 volts
B.40 volts
C.14 volts
D.4 volts
Ans: B
26.The temperature of electric arc is about?
A.3000 deg Celsius
B.300 deg Celsius
C.3500 deg Celsius
D.350 deg Celsius
Ans: C
27.S.W.G. stands for?
A.Suitable wire gauge
B.Selected wire gauge
C.Special wire gauge
D.Standard wire gauge
Ans: D
28.In case of medium coated electrodes, the ratio of coating diameter to the core wire diameter is from?
A.1.2 to 1.3
B.1.3 to 1.4
C.1.4 to 1.5
D.1.5.to 1.6
Ans: C
29.Injector type blow pipe is of?
A.Low pressure type
B.High pressure type
C.Medium pressure type
D.None of these
Ans: A
30.Central white cone is found in?
A.Carborising flame
B.Oxidising flame
C.Natural flame
D.None of these
Ans: C
31.Which is destructive metal test?
A.Flame test
B.Magnet test
C.Colour test
D.Chisel test
Ans: A
32.Kindling temperature is about?
A.1250 deg Celsius
B.1500 deg Celsius
C.1350 deg Celsius
D.1400 deg Celsius
Ans: C
33.The required voltage for 100 to 120mm thick steel plate inspected by X-rays radiography is?
A.220 K.V.
B.400 K.V.
c.1000 K.V.
D.150 K.V.
Ans: B
34.The marking of a spot weld is affected by?
A.The surface condition of the material to be welded.
B.The electrode pressure.
C.The size of welding current.
D.The time of application of the current.
E.The shape and area of the electrode tip
F.All above
Ans: B
35.D.C. welding equipment used for under water welding has a capacity of?
A.50 Amps
B.100 Amps
C.200 Amps
D.300 Amps
Ans: D
36. Purified air becomes in liquid state at:
A. - 100 degree Celsius
B. - 180 degree Celsius
C. - 182 degree Celsius
D. - 82 degree Celsius
Ans: C
37.Calcium carbide is produced by fusing coke with?
A.Water
B.Acid
C.Lime
D.None of these
Ans: C
38.Generally, the electrodes are produced in the length of?
A.250mm
B.300mm
C.350mm
D.450mm
E.All above
Ans: E
39.The rough welds are due to?
A.Too low current
B.Too high current
C.Wrong arrangement of electrodes
D.All above
Ans: D
40.The metals can be identified by?
A.Colour test
B.Weight test
C.Flame test
D.Magnet test
E.All above
Ans: E
Mark following statements as True or False:
41.Polarity of anode is positive
Ans: True
42.Wave length of gamma rays is more than that of X-rays.
Ans: False
43.High pressure torches are always of non-injector type.
Ans: True
44.Melting point of pure aluminium is less than that of oxide of aluminium.
Ans: False
45.4mm = 8 S.W.G.
Ans: True
Fill in the blanks:
46.A low hydrogen electrodes is called ....................... electrode.
Ans: Basic
47.Carbon monoxide gas is very low in ......................... welding.
Ans: Arc
48.Laser stands for ............................................
Ans: LIght Amplification by Simulated emission of Radiation
49.The core wore is of mild steel or .......................
Ans: Low carbon steel
50.Temperature of oxy-acetylene flame is ......................... than that of oxy-hydrogen
Ans: Higher
51.According to ISI (815-1956), code number consists of M followed by six digit. In this what does second digit stand for?
A.Type of coveringB.Welding position
C.Welding curretn conditions
D.Minimum tensile strength of weld metal
Ans: B
52.DC electrode positive and on AC with open circuit voltage over 95 volts is indicated by?
A.D+ means
B.D+ A95 means
C.D- A95 means
D.D+ A70 means
Ans: B
53. 10 SWG is equial to?
A.10mm
B.1mm
C.3.2mm
D.32mm
Ans: C
54.Which one is best to increase the safety?
A.MOtor-generator
B.Rectifier
C.Transformer
D.None of above
Ans: A
55.In case of welding in flat position, weld slope does not exceed?
A.50 degree
B.40 degree
C.20 degree
D.10 degree
Ans: D
56.The position in which it is easiest to weld is?
A.Flat
B.Horizontal
C.Vertical
D.None of these
Ans: A
57.Zinc fumes are produced by welding of?
A.Galvanised iron
B.Cast iron
C.Wrought iron
D.None of these
Ans: D
58.Infra red rays have a wave length raning from?
A.700 to 2000 millimicrons
B.725 to 2500 millimicrons
C.725 to 3000 millimicrons
D.750 to 2000 millimicrons
Ans: D
59.Hight pressure blow pipes is of?
A.Non-injector mixer pattern
B.Injector mixer pattern
C.None of above
Ans: A
60.Under water welding is generally restricted to?
A.Mild steel
B.Tor steel
C.High carbon steel
D.None of these
Ans: A
61.Commutator is used?
A.To collect current from armature
B.To rectify the armature AC into DC
C.For both pruposes A & B
D.None of these
Ans: C
62.An excess quantity of oxygen is mixed with acetylene for burning and obtaining?
A.Natural flame
B.Oxidising flame
C.Carbruising flame
D.None of above
Ans: B
63.When an electric arc is struck, the electrical energy available for heat energy, is about?
A.30%
B.40%
C.50%
D.60%
Ans: C
64.Oxygen hoses are made to stand upto?
A.3 atmosphere
B.10 atmosphere
C.7 atmosphere
D.5 atmosphere
Ans: B
65.The current in the welding arc may vary from?
A.10 to 20 amperes
B.100 to 200 amperes
C.100 to 1000 amperes
D.100 to 2000 amperes
Ans: D
66.The normal changing pressure of dissolved acetylene is?
A.5 atmospheric pressure
B.10 atmospheric pressure
C.15 atmospheric pressure
D.20 atmospheric pressure
Ans: C
67.The recrystallised weld metal has?
A.Maximum ductility
B.Crack resistance
C.Both A & B
D.None of these
Ans: C
68.Explosion welding can be used for?
A.Beryllium
B.Tungsten
C.Boron
D.None of these
Ans: D
69.DC welding equipment used for under water welding has a capacity of?
A.50 Amps
B.100 Amps
C.200 Amps
D.300 Amps
Ans: D
70.Liquid oxygen is converted back to gas by using?
A.Gasificator
B.Generator
C.Regulator
D.Valves
Ans: A
Note: Heavy Vehicles Factory, Avadi reserves All the right to change/alter the examination model without showing any reason. Prepare yourself in strength of knowledge in your Trade for semi skilled interview.
Source: http://www.ofbindia.gov.in
19.Corrosion resistance of welded joints is effected due to?
ReplyDeleteA.Parent metal thickness
B.Number of passes
C.Arc current
D.Speed of weld
Ans:" E" what is this ans is "E" wr is "E" option ??????????