126/2015

Maximum: 100 marks
Time: 1 hour and 15 minutes

1. While soldering what action is applied on solder?


(A)Capillary action


Gravitational force


(C)Electromagnetic force


Magnetic action


2. Which one of these a pressure welding method?


(A)ARC welding


Gas welding


(C)Resistance welding


Thermit (fusion) welding


3. Which of the following is not an insulator?


(A)Gold


(B)Glass


(C)Mica


Wood


4. Which type of fire extinguisher is used in a welding shop?


(A)Form type extinguisher


CO2 extinguisher


(C)Dry powder extinguisher


Halon extinguisher


5. The term used to indicate amount of current flow in a circuit is called:

(A)Volt


(B)Farad


(C)Ohm


Ampere


6. The depression formed at the end of the weld is named as

(A)Pin hole


Crater


(C)Blowhole


Crack


7. The semicircular deposits on the weld head are called:


(A)Sealing run


Crater


(C)Reinforcement


Undercut


8. The angle formed between the line of the weld root and horizontal reference plane is called:


(A)Weld slop


(B)Weld rotation


(C)Axis of the weld


(D)Weld angle



9. Transferred arc process and non transferred arc process are the classification of process.

(A)Stud


(B)Submerged arc


(C)Plasma


(D)Friction



10. In the pipe in 45° Inclined and fixed and welding has been done in various positions.














11. 212°C Fahrenheit is centigrade.







(C)100°C





12. Name the simplest test which uses sound to know that there is a crack in a weld:

(A)Stethoscopic


(B)Ultra sonic


(C)Gamma ray test


X-ray test


13. Austenitic Stainless steel chromium.


to 12


(B)0.25 to 0.5


to 30


to 22


14. Which Instrument is used to mark straight line mark on base plate parallel to a plate edge?

(A)Divider


(B)Odd leg caliper


(C)Outside caliper


(D)Inside caliper


15. Arc blow is found with welding of:


(A)Bare electrode


Coated electrode


(C)Law hydrogen electrode


Heavy coated electrode


16. Lack of penetration is due to

(A)High current


Low current


(C)Short arc length


Too slow welding speed



17. Which one of the easiest welding position:


(A)Vertical


(B)Overhead


(C)Horizontal


Down hand


18. Two methods of flux coating on electrodes are:

(A)Sucking and blowing


Blowing and pasting


(C)Dipping and extrusion


Blasting and heating


19. The purity of Acetylene is checked the filter paper soaked in 10% silver nitrate solution against the stream of acetylene. The filter paper changes in to

(A)Black Colour


(B)Blue colour


(C)Red colour


(D)Brown colour


20. Which one of the following is a non destructive test?

(A)Impact test


(B)Tensile test


(C)Nick break test


(D)Magnetic particle test


21. The unit of measurement of heat is

(A)Centigrade


Calorie


(C)Fahrenheit


Temperature


22. Which metal is more root opening, wider grove angle and more number of tack welds are essential in arc welding?

(A)Copper


(B)Cast iron


(C)Mild steel


(D)Stainless steel


23. Light hammering of the weld metal immediately after weld deposition. It is a method to prevent distortion:

(A)Cracking


(B)Knocking


(C)Peening


Chipping


24. The third compartment contains in the purifier is

(A)Purifying chemicals


Water


(C)Pumice stone


Filter wool


25. Name the metal which does not allow X-rays to pass through it


(A)Tin


(B)Zinc


(C)Lead


(D)Copper


26. Which physical property of metals helps retaining the molten metal deposited on the joint in over head welding?

(A)Thermal contraction


Surface tension


(C)Magnetic attraction


Density


27. Friction welding is suitable to weld:

(A)Rectangle Job


Square Job


(C)Irregular Job


Circular Job


28. The welding blow pipe nozzle size for welding 3 mm sheet:

7


5


2


10

29. In arc welding eyes need to be protected against:


(A)Intense glare


Sparks


(C)Ultra violet rays


(D)Infra red rays


30. Which of the following welding process uses non consumable electrode?


(A)Laser welding


(B)TIG welding


(C)MIG welding


(D)Thermit welding


31. The main criterion for selection of electrode diameter in arc welding:


(A)Thickness of materials


The materials to be welded


(C)Voltage used


Current used


32. The cutting angle of a straight Snips is

deg


deg


deg


deg


33. Name the instrument/tool used for transfer and setting off distances:


(A)Steel rule


(B)Straight edge


(C)L-Square


(D)Wing compass


34. The correct electrode angle is used in Arc welding with the weld line is














35. What is the identification of tip colour for thorium added tungsten electrode?


(A)Green


(B)Yellow


(C)Red


Brown


36. What is the name of space left blank in the gas cutting?

(A)Drag


(B)Groove


(C)Kerf


Space


37. What type of heat treatment is used to get the original grain structure?

(A)Tempering


(B)Preheating


(C)Hardening


Normalizing


38. Seam welding is a

(A)Multi spot welding process


(B)Continuous welding process


(C)Used to form mess


(D)Used for welding cylindrical object


39. A non distinctive test requires a photographic film to be placed on one side of the joint to be tested. What is the test?


(A)Ultra sonic test


(B)Dye penetrate test


(C)Radiographic test


Magnetic particle test


40. Welding Transformers are equipped with condensers. So as to

(A)Current factor


(B)Energy factor


(C)Voltage factor


Power factor


41. In gas cut plate the cut shows grooves and has deep draglines. This is due to

(A)Tip too close to the cut surface


Too much Travel speed


(C)Less oxygen pressure


Smaller size cutting nozzle


42. Electrode holders are made out of

(A)Aluminum and their alloys


Zinc and their alloys


(C)Copper and their alloys


Steel and their alloys


43. An alloy used in Brazing process is

(A)Solder


Lead


(C)Thermit


Spelter


44. The tip angle of centre punch is













45. One type of inert gas welding is

(A)CO2 welding


(B)TIG welding


(C)Atomic hydrogen arc welding


Termite welding


46. The melting Temperature of Alumina (Al2O3) is


(A)659°C


(B)1200°C


(C)2030°C


(D)1650°C


47. Which position is tough to weld for beginners?


(A)Flat


(B)Vertical


(C)Horizontal


(D)Overhead


48. The deviation of arc is called arc blow. It is caused by


(A)Electrical disturbance


Magnetic disturbance


(C)Electronic disturbance


Radio disturbance


49. The two plates are lying in same plane and joint together. These types ofJoints are called:

(A)Lap joint


Edge joint


joint


Butt joint


50. The depth of fusion from the surface of the weld metal is

(A)Fusion zone


Heat affected zone


(C)Penetration


Leg length


51. The flux coating of electrode contains cellulosic material coating. These electrodes are:

Low hydrogen


Iron powder electrode


(C)Deep penetration electrode


Heavy coated electrode



52. The left handed threaded valves is used in which gas cylinder?

C2H2


O2


CO2


NH3


53. Granular flux and bare wire electrode is used in which type of welding?


(A)MIG


(B)SAW


(C)TIG


(D)MAG


54. Which one of the following is cause backfire in Oxy Acetylene blow pipe?


(A)Nozzle is over heated


(B)Nozzle orifice blocked


(C)Leakage near the nozzle


(D)Gas pressure setting is high


55. AWS code of electrodes starts with the letter followed by four digit number. What is the fourth digit number?


(A)Welding position


(B)Type of flux coating


(C)Current condition


Tensile Strength


56. Gray cast iron is a type of material which can weld. It contains of carbon.

to


to


to


to 12%


57. In submerged arc welding type of flux is used.

(A)Powder


Paste


(C)Granular


Form


58. Fahrenheit scale is a type of meter scale. It has equal division.

100


180


80


120


59. The diameter of electrode and the arc length are equal. That type of arc length is called?


(A)Long arc length


(B)Medium arc length


(C)Short arc length


(D)None of the above


60. Oxygen cylinders can store gas to a capacity of 7M3 with the pressure ranging between:


120-150 Kg/cm2


100-110 kg/cm2


150-180 Kg/cm2


50-60 Kg/cm2



61. The hottest temperature oxy acetylene flame is


Neutral flame


Carburizing flame


Oxidizing flame


Oxy LPG flame


62. The nozzle size of blow pipe for gas welding 4 mm thick plates:

10


2


25


5

63. In high pressure oxyacetylene plant the maximum pressure of acetylene gas is


Kg/cm2


Kg/cm2


Kg/cm2


25 Kg/cm2


64. For complete combustion one volume of acetylene requires______volume of oxygen.

3


5


1.5


2.5


65. Commutators are made out of:

(A)Mild segment


(B)Aluminum segments


(C)Copper segments


Cast iron segments


66. In straight polarity the heat distribution in electrode side is

1/3


2/3


3/3


1/2


67. 1/4 of 3/5 of 6/5 a Number is 54. What is the number?


(A)280


(B)250


(C)300


(D)150


68. The value of x and y for the equation X +3Y =15 and 5X-2Y are:














69. If the diagonal of a square is 6root3. Then the area of this square will be


66


50


60


54


70. This metal transfer method is not used in MIG/MAG welding process:


(A)Spray transfer


(B)Repelled transfer


(C)Dip transfer


Globular transfer


71. For all structural work ferrous metals are used. What is the advantage of ferrous metals over non ferrous metals?


(A)Can be easily welded


(B)Available in large quantity


(C)Cheaper in large quantities


(D)Better mechanical and physical properties


72. Which is the correct method to remove the chips from the file?


(A)Blow away the chip


(B)Brush the chip away


(C)Flush the chip with water


(D)Flush the chip with coolant


73. Intermittent welding method is used to


(A)Minimize the amount of weld metal


(B)Get uniform distribution of heat over welding joint


(C)Reduce the residual stress in joint


(D)Plates expanded to a lesser degree with head each


74. What is the correct procedure for reconditioning a bell mouthed tip of an oxyacetylene welding nozzle?


(A)Filing the tip end


(B)Replace the tip


(C)Ream the orifice to a large size


None


75. Argon gas cylinder is colour.


(A)Red


(B)Black


(C)Brown


(D)Blue


76. S.I. unit of force is


(A)Watt


(B)Joule


(C)Newton


Kg m



77. Mechanical efficiency of simple machine is?

(A)LoadlEffort


(B)Effort/load


(C)Mechanical advantage/velocity ratio


Velocity ratio/mechanical Advantages


78. The property of which metal can be drawn into wires without breaking is known as


(A)Brittleness


(B)Hardness


(C)Malleability


Ductility


79. The Size of the title block for all Size of drawing sheet is to mm.


(A)110 to 225


(B)185 to 65


(C)200 to 30


125 to 24


80. In first angle projection method the object comes between the and the

(A)none of the below


(B)observer and object


(C)plane and object


(D)observer and plane


81. In third angle projection method the plans comes between the and the


(A)Observer and plane


(B)Observer and object


(C)Plane and object


(D)None of the above


82. Centre lines locus lines and pitch circle are drawn as

(A)Thick continuous line


Thin continuous line


(C)Long and thin chain lines


Dashed line of medium thickness


83. The form of a welded joint is specified by means of a symbol. Its location is indicated by an


(A)Axis and size


Arrow and dashed line


(C)Axis and centre lines


Arrow and reference line


84. To prevent leakage through the Riveted Joint. The plates are firmly forced together by


(A)Caulking and fullering


Punching and squeezing


(C)Peening and pulling


Soldering and brazing



85. It is a temporary fastening:

(A)Riveting


Nut and bolt


(C)Soldering


Brazing


86. is not an inert gas used in MAG welding.

(A)Argon


(B)Helium


(C)CO2


(D)Neon


87. Brass is a alloy of:

(A)Copper and zinc


(B)Copper and tin


(C)Copper and lead


Copper and bronze


88. The operation consists of depositing a layer of hard metal on a softer base metal in order to provide surface having hardness and resistance to abrasion:

(A)Hardening


Hard facing


(C)Arc welding


Tempering


89. The melting point of tungsten is

(A)1232°C


(B)2200°C


(C)1426°C


(D)3410°C


90. Which defect can be found by visual examination of the weld joint?

(A)Misalignment of parts


Lack of fusion


(C)Root defect in a filler weld


Inter lead slag inclusion


91. Which type of test in hazardous to the testing operator?

Ultrasonic test


X-ray test


Magnetic particle test


Dye-penetrant test


92. In an examination 93% of the student passed and 259 failed. The total number of students must be:

(A)3950


(B)500


(C)3700


(D)None of the above


93. Volume of a sphere of radius is


4/3pieR3


1/3pieR3


2/3pieR3


4/3pieR2


94. What is the size of gas nozzle used for 6 mm diameter tungsten in TIG welding process?




(B)11.5








95. What does the letter indicate in the electrode coating EB5426H1kX?


(A)Iron powder electrode with 130 to 149% recovery


(B)Iron powder electrode with 110 to 129% recovery


(C)Radiography quality electrode


(D)Low hydrogen electrode


96. If a worker has suffered from electric shock, he should be


(A)Given an alcoholic drink


(B)Given a cold drink


(C)Made to walk


(D)Kept warm and covered


97. Which of the following resistance welding machine is used to join pipe sections end to end?

(A)Projection


(B)Butt


(C)Spot


(D)Seam


98. In MIG/MAG welding filler wire is used, when the filler wire is copper coated?


prevent base metal reaction


prevent atmosphere


prevent gas shield


prevent rust


99. In which solution the filter paper is soaked to test the purity of generated acetylene gas?

(A)Copper sulphate


(B)Silvernitrate


(C)Caustic soda


(D)Sodium nitrate


100. the distance between the end of the contact tube and the tip of the electrode in GMAW process.


(A)Stick out


(B)Arc length


(C)Tip to work distance


(D)Gangue length