MCQ type Objective Question Bank

Name of the Trade : Welding

Trade Code : WELD

Choose the correct answer :

1 Which one is the temporary joint

(a) Forged Welding

(b) Cotter Joint

(c) Brazing

(d) soldering

2 Which is the non pressure welding

(a) Spot Welding

(b) Seam Welding

(c) Arc Welding

(d) Forge Welding

3 Oxi Acetylene Gas flame used in

(a) Gas Welding

(b) Gas Cutting

(c) MIG Welding

(d) (A) & (B) both

4 The colour code of Combustible Gas is

(a) Red

(b) Blue

(c) Black

(d) Green

5 The chemical formula of Acetylene is

(a) C4H4

(b) C2H2

(c) CO2

(d) C2O2

6 The Flame Temperature of Oxy – Acetylene Gas

(a) 1750° - 2000°C

(b) 2400° - 2700°C

(c) 3000° - 3300°C

(d) 3600° - 4000°C

7 Which one of the flame develops lowest temperature

(a) Oxy-Coal

(b) Oxy-Hydrogen

(c) Oxy-Acetylene

(d) Oxy-Propane-Butane

8 The term D.A. means

(a) Dissolve – Acetylene

(b) Dissipitate – Acetylene

(c) Delevered – Acetylene

(d) None of these.

9 The ratio of the oxygen is to Acetylene in the neutral flame is

(a)

2:1

(b)

1:2

(c) 1:1

(d)

3:1

10 The best flame is used to join mild steel sheet is

(a)

Carburising flame

(b)

Oxidising flame

(c) High Pressure Flame

(d)

Neutral Flame

11 The dissolve acetylene is called

(a)

Acetone

(b)

Oxytone

(c) Oxyacetone

(d)

None of these.

12 Making Butt Weld on Light Gauge Sheet Metal in flat position the torch tip should be held at about

(a)

30°

(b)

45°

(c) 60°

(d)

75°

13 Nozzle No. 1 is used to weld plate thickness

(a)

Less than 1mm

(b)

Greater than 1mm

(c) Greater than 10mm

(d)

None of these

14 The flame used to weld cost iron is

(a)

Neutral Flame

(b)

Oxidising Flame

(c) Carburising Flame

(d)

Laxness oxidising flame

15 Preheating is required to weld cast iron because it prevents

(a)

Oxidation

(b)

Nitridation

(c) Cracking due to expansion an contraction

(d)

None of these

16 Pre heating upto ___________temperature is required during Oxy-Acetylene cutting process

(a 200°C

)

(b)

300°C

(c) 600°C

(d)

900°C

17 To weld aluminium the flame is used

(a)

Neutral Flame

(b)

Oxidising Flame

(c) To increase in small amount of oxygen in neutral flame

(d)

To increase in small amount of Acetylene in Neutral Flame

18 The supporting gas for combustion is

(a)

Carbon dioxide

(b)

Nitrogen

(c) Oxygen

(d)

Acetylene

19 It is required to combust unit volume of Acetylene Oxygen is

(a)

1.5 times

(b)

2.5 times

(c) 3.5 times

(d)

4.5 times

20 Oxy Acetylene Cutting Nozzle is normally held at

(a)

30°

(b)

45°

(c) 60°

(d 90°

)

21 Which one is the no-fusion welding

(a)

Forged Welding

(b)

MIG Welding

(c) TIG Welding

(d)

MMAW Welding

22 The distance between electrode tip and base metal is called

(a)

Arc Length

(b)

Arc Gap

(c) Arc Distance

(d)

Arc Width

23 Reduction in molten metal occurs due to

(a)

Increase of current

(b)

Decrease of current

(c) Decrease of Arc Length

(d)

Slow welding

24 Capacity of a welding machine is denoted by

(a)

Input Amps

(b)

Output Amps

(c) Open Circuit Voltage

(d)

Close Circuit Voltage

25 Arc blow is caused for

(a)

Magnetic field

(b)

Radiation field

(c) Radio Active field

(d)

None of these

26 Arc below mostly found during welding in a

(a)

D.C. Machine

(b)

Bare Electrode

(c) A.C. Machine

(d)

Both (a) & (b)

27 The length of the electrode is found in

(a)

250mm and 350mm

(b)

350mm and 450mm

(c) 150mm and 250mm

(d)

400mm and 500mm

28 Welding machine used to weld non ferrous materials is

(a)

Welding Transforma

(b)

Motor Generator Set

(c) Welding Rectifier

(d)

Capacitor set

29 If the arc length increases the voltage

(a)

Increases

(b)

Decreases

(c) Same

(d)

May increase or decrease

30 For welding the following one is necessary

(a)

Low current high voltage

(b High current low voltage

)

(c) Low current low voltage

(d)

High current high voltage

31 Weld screen has transparent glass

(a)

To save eye

(b)

To save mouth

(c) To save colour glass

(d)

To save head

32 Weld screen has transparent glass

(a)

To save eye

(b)

To save mouth

(c) To save colour glass

(d)

To save head

33 Weld is a _________ joint

(a)

Permanent

(b)

Semi permanent

(c) Temporary

(d)

Semi temporary

34 Current required for welding in 8.5 S.W.G. is __________ amps

(a)

50-70

(b)

100-120

(c) 130-150

(d)

180-200

35 Diameter of electrode depends upon

(a Length of welding

)

(b)

Position of welding

(c) Volume of welding

(d)

Thickness of base metal

36 During overhead welding, the welder must wear

(a)

Welding goggles

(b)

Helmet

(c) Hand screen

(d)

sunglass

37 During welding the voltage remains in the machine is called

(a)

Open circuit voltage

(b)

Supply voltage

(c) Output voltage

(d)

Close circuit voltage

38 Maintenance cost of motor generator set over rectifier set is

(a)

Low

(b)

High

(c) Same

(d)

Very low

39 Welding may be done where current supply is not available

(a)

Motor generator set

(b)

Rectifier set

(c) Diesel generator set

(d)

Transformer set

40 The coolant used in the transformer is

(a)

Air or oil

(b)

Air or water

(c) Oil or water

(d)

None of these

41 The wire which connects the machine and holder is called

(a)

Welding cable

(b)

Welding wire

(c) Holder wire

(d)

Holder cable

42 When output current in the welding machine is higher then the voltage (output) is

(a)

Same

(b)

Low

(c) High

(d)

Not depends upon current

43 Termite welding is a ___________ welding

(a)

Fusion

(b)

Resistance

(c) Chemical

(d)

Plastic

44 The layer deposited after welding is called

(a)

Sleg

(b)

Chip

(c) Slag

(d Coating

)

45 Which one is not the function of flux

(a)

Controlling current

(b)

Preventing oxidation

(c) Stabilising arc

(d)

Remove dirt, dust and oiliness

46 During lightening in a gas burner first we have to open

(a)

Acetylene regulator in burner

(b)

Oxygen regulator in burner

(c) Both oxygen and acetylene regulator or cylinder

(d)

Both oxygen and acetylene regulator of burner

47 Slag from welding portion is removed by

(a)

Chipping hammer

(b)

Claw hammer

(c) Straight peen hammer

(d)

Mallet

48 Transforma ARC welding machine may be connected with

(a)

110 volt supply

(b)

220 volt supply

(c) 440 volt supply

(d)

Both 220 and 440 volt supply

49 During welding job should be placed in material that must be a conductor due to maintaining

(a)

Continuity

(b)

Absorb of heat

(c) Prevent of absorbing moisture

(d)

None of these

50 The regulator in the welding machine regulates

(a)

Input current

(b)

Out put current

(c) Output voltage

(d)

Input voltage

51 Nozzle runner in gas welding is detained by

(a)

Plate thickness

(b)

Gas consumption

(c) Gas pressure

(d)

Size of filler material

52 Filler rod of gas welding

(a)

Bare

(b)

Flux coated

(c) Bare but enamelled

(d)

Flux coated and enamelled

53 The distance between electrode and base metal must be within

(a)

4-6mm

(b)

3-4mm

(c) 2-3mm

(d)

1-2mm

54 Long arc length is the cause of

(a)

Lack of fusion

(b Under cut

)

(c) Crack

(d)

Spatter

55 Welding transformer is a

(a)

Step down

(b)

Step up

(c) Self induced

(d)

Slipping transformer

56 Edge preparation must be done during welding because it requires

(a)

Groove

(b)

Cleaning

(c) Shape

(d)

Size

57 Tag welding is required to prevent

(a)

Spatter

(b)

Crack

(c) Distortion

(d)

Under cut

58 The most easiest welding can be done

(a)

When the job is in overhead position

(b)

Flat position

(c) Vertical position

(d)

Horizontal position

59 Code diameter of an electrode is

(a Diameter of cable including insulation

)

(b)

Diameter of electrode excluding flux

(c) Diameter of electrode including flux

(d)

Diameter of electrode including cable diameter

60 The angle between base metal and electrode should be _____________ during lap joint

(a)

60° - 75°

(b)

50° - 60°

(c) 40° - 50°

(d)

30° - 40°

61 In spot welding the voltage is recommended between the range

(a)

40 – 60

(b)

20 – 30

(c) 10 – 20

(d)

2 – 4 volt

62 In spot welding machine pressure is applied by

(a)

Hand lever

(b)

Foot lever

(c) Motor

(d)

Hydraulic and foot lever both

63 In spot welding machine a timer is required to

(a)

Show current timing

(b)

Show voltage timing

(c) Current cut off

(d)

Voltage cut off

64 Welding cable is made of _____________ wire

(a)

Copper

(b)

Aluminium

(c) Steel

(d)

Brass

65 The specification of a welding cable is denoted by

(a)

Diameter

(b)

Current carrying capacity

(c) Voltage carrying capacity

(d)

None of these.

66 When electrode cannot be withdrawn the welding will stop. This is known as

(a)

Arc peening

(b)

Arc freezing

(c) Arc shielding

(d)

None of these

67 The weight of the electrode holder should be not more than

(a)

200gms

(b)

300gms

(c) 400gms

(d)

600gms

68 Hand screens weigh should be limited with

(a)

200gms

(b)

300gms

(c) 400gms

(d)

600gms

69 Pre heating upto _________ °C is required for gas cutting

(a)

240

(b)

300

(c) 500

(d)

900

70 In MMAW Process the arc temperature is

(a)

1700-1800°C

(b)

3000-3600°C

(c) 3600-4000°C

(d)

2500-2700°C

71 Brazing is also known as

(a)

Hard Soldering

(b)

Hard Joining

(c) Medium Soldering

(d)

Brass joining

72 Solder materials is alloy of

(a)

Copper and zinc

(b)

Copper and tin

(c) Lead and tin

(d)

Copper and lead

73 Dry Chamber System is the type of welding system performs in

(a)

Furnace

(b)

Under water

(c) Boiler

(d)

Gas chamber

74 Oxygen in the oxygen cylinder is kept under pressure of

(a)

60 kgf/cm2

(b)

110 kgf/cm2

(c) 140.6 kgf/cm2

(d)

200 kgf/cm2

75 Oxygen cylinder are made of

(a)

Cast steel

(b)

Seamless drawn steel

(c) Mild steel

(d)

Manganese steel

76 The heat is produced by an arc between a continuously fed electrode is called

(a)

MMAW

(b)

SMAW

(c) Submerged

(d)

MAG

77 Carbon dioxide gas is

(a)

Inert gas

(b)

Active gas

(c) Non consumable gas

(d)

Non active gas

78 Gases of plasma arc is

(a)

Hydrogen

(b Argon

)

(c) Carbon dioxide

(d)

Argon with 5% - 15% hydrogen

79 Forged welding is done in

(a)

Machine shop

(b)

Fitting shop

(c) Smithy shop

(d)

Welding shop

80 Welding temperature for iron and steel in forged welding should reach

(a)

1500°C

(b)

1100°C

(c) 1000°C

(d)

900°C

81 Forged welding requires a striking tools that is

(a)

Ball peen hammer

(b)

Straight peen hammer

(c) Sledge hammer

(d)

Claw hammer

82 Resine used as a flux in

(a)

Soldering

(b)

Brazing

(c) Welding

(d)

None to these

83 Which one of the joint is not a permanent joint?

(a Riverting

)

(b)

Flange joint

(c) Brazing

(d)

Soldering

84 Which one of the joint is not a temperature joint?

(a)

Coupling

(b)

Stud joint

(c) Forged welding

(d)

Key joint

85 The unit of power is

(a)

Joule

(b)

Volt ampere

(c) Joule / See

(d)

Newton

86 The e.m.t. develops in a transforma

(a)

Primary circuit

(b)

Secondary circuit

(c) Rectitier circuit

(d)

None of these

87 The secondary circuit is linked with the primary circuit

(a)

Magnetically

(b)

Electrically

(c) No link

(d)

Scott connection

88 The e.m.t. depends upon

(a)

Rate of flux cutting

(b)

Number of turns in secondary circuit

(c) Number of turns in primary circuit

(d)

(a) & (b) both

89 The connection required in a transforma (440 volt) by

(a)

Single pole main switch

(b)

Double pole main switch

(c) Triple pole main switch

(d)

Any one of these.

90 The 440v transforma should be connected with a ____________ amps main switch

(a)

15

(b)

30

(c) 65

(d)

100

91 LASER beam weld has a limitation to weld upto plate thickness

(a)

15mm

(b)

10mm

(c) 5mm

(d)

3mm

92 Antogenous welding involves with

(a)

Similar metal

(b)

Dissimilar metal

(c) Alloys

(d All of these

)

93 When electrode touches in the job then current flows about _______% of heat develops in positive pole

(a)

40%

(b)

50%

(c) 60%

(d)

67%

94 Reverse polarity is used when

(a)

Job thickness is more

(b)

Job thickness is less

(c) Electrode thickness is more

(d)

Electrode thickness is less

95 Under cut develops due to

(a)

Poor penetration

(b)

Low current

(c) High current

(d)

High voltage

96 Peening is required to

(a)

Strain relieved

(b)

Stress relieved

(c) Nodular formation of molten metal

(d)

None of these

97 Peening is done by

(a) Hammer

(b) Clipping hammer

(c) Holder

(d) Electrode

98 Due to high temperature metal expends and the defect occurs is called

(a) Under cut

(b) Distortion

(c) Porosities

(d) Spatter

99 Hand screen protects

(a) Ultra violet rays

(b) Heat

(c) Spatter

(d) All of these

100 In TIG welding the electrode is

(a) Non consumable

(b) Consumable

(c) Both (a) & (b)

(d) It has no electrode

101 The gas used in TIG welding is

(a) Acetylene

(b) Oxygen

(c) Argon

(d) Carbon dioxide

102 The gas used in MAG welding is

(a) Acetylene

(b) Oxygen

(c) Argon

(d) Carbon dioxide

103 To weld 6mm thickness mild plate the required electrode size is

(a) 4 S.W.G. (b) 6 S.W.G. (c) 8 S.W.G. (d) 10 S.W.G.

104 To weld with 10 SWG electrode the current requires _______ amps.

(a) 30 – 60 (b) 50 – 70 (c) 100 – 120 (d) 130 – 150

105 To weld a metal in horizontal position the electrode should be held _______ inclined to the plate

(a) 15° (b) 30° (c) 45° (d) 60°

106 To weld a metal in vertical position the electrode should be held __________ inclined to the plate

(a) 30° (b) 45° (c) 60° (d) 75°

107 To weld a metal in overhead position with the plate

(a) 30° - 45° (b) 45° - 60° (c) 60° - 75° (d) 75° - 90°

108 Rectifiers are made of _____________ for converting alternating

current (AC) into direct current (DC)

(a) Conductor (b) Semi conductor (c) Non Conductor (d) None of these

109 No need of maintaining polarity when the welding machine is ________ type

(a) Motor generator set

(b) Rectifier set

(c) Transformer

(d) Diesel generator set

110 In welding machine the main objective is to produce __________ for generating an arc

(a) High current low voltage

(b) Medium current medium voltage

(c) Low current high voltage

(d) Low current low voltage

111 Weaving motion of electrode is required to

(a) Balance of welding

(b) Improves penetration and fusion

(c) Back step welding

(d) Skip welding

112 To weld of a cast iron job the electrode will be

(a) Cast iron

(b) Mild steel

(c) Manganese steel

(d) Ferro silicon steel

113 Projection welding is a _____________ welding

(a) Forged

(b) Fusion

(c) Resistance

(d) Brazed

114 Welding decay can be avoided by

(a) Post heating

(b) Pre heating

(c) Post cooling

(d) Pre cooling

115 Aluminium can be successfully welded by

(a) MMAW (b) SMAW (c) TIG (d) MAG

116 The flux uses in the submerged arc welding by

(a) Laid over the welding zone

(b) Fed with electrode

(c) Coated with electrode

(d) Tied by hand

117 In submerged arc welding which of the following cannot be found

(a) Spatter

(b) Smoke

(c) Slag

(d) Arc flash

118 To weld a light gauge sheet we should have to use jig and fixtures to prevent

(a) Hardening

(b) Distortion

(c) Spattering

(d) Welding decay

119 Thicker material say 25mm M.S. Plate should be weld in

(a) Single run

(b) Double run

(c) Multi run

(d) Triple run

120 Welding cables are made of a large number of tinned copper wires of diameter

(a) 0.18 – 0.20mm

(b) 0.25 - 0.30mm

(c) 0.30 - 0.35mm

(d) 0.35 - 0.40mm

121 Gamma rays are very _________ frequency electromagnetic radiation

(a) High

(b) Low

(c) Medium

(d) Radio

122 Gamma rays are similar to X rays but of ____________ wavelength

(a) Higher

(b) Shorter

(c) Medium

(d) Straight

123 The shear area of a welded portion depends upon

(a) Bead length x length of weld

(b) Bead length / length of weld

(c) Length of weld / bead length

(d) Bead length

124 In carbon arc welding of light gauge plates, the use

of _________ may not be necessary

(a) Cable

(b) Electrode

(c) Filler rod

(d) Flux

125 Acetylene may be produced with

(a) Calcium carbide and water

(b) Calcium nitrade and water

(c) Calcium sulphate and water

(d) Calcium hydrate and water

126 Wire brush is used to remove

(a) Dust from job

(b) Dust and slag dust from the job

(c) Oil and grease

(d) None of these

127 The flux is a substance capable of dissolving the __________

(a) Nitride

(b) Oxide

(c) Sulphide

(d) Bromide

128 Braze welding is the process in which the metal of filler

rod or wire has a _________ melting point than that of the parent metal

(a) Lower

(b) Higher

(c) Same

(d) None of these

129 In spot welding the heating effect occurs when a current flows

through a _________

(a) Inductance

(b) Reactance

(c) Resistance

(d) Capacitance

130 In spot welding, temperature can reach upto _______°C.

(a) 200

(b) 250

(c) 300

(d) 500

131 Shielding gaser for welding must be low dew point temperature

because any _______ in the gas will turn into hydrogen and oxygen

when it passes through a welding avc

(a) Acid

(b) Water

(c) Alkali

(d) Oil

132 One of non-ferrous electrodes widely used in the arc welding of

cast-iron is ______ metal

(a) Monel

(b) White

(c) Solder

(d) Brass

133 Draw arc process is used in _________ welding

(a) PIG

(b) MIG

(c) STUD

(d) ARC

134 Large bridges are mounted on rollers fitted on the supporting pillars to

allow the bridge to _________ due to heat

(a) Contraction

(b) Expand

(c) Swing

(d) None of these

135 The double vee but joint is generally employed for _______ plates.

(a) Thinner

(b) Heavier

(c) Medium

(d) Double

136 Which one of the following is not controlled distortion

(a) Back step welding

(b) Skip welding

(c) Intermittent welding

(d) Right hand welding

137 The gas nozzle of the torch used for gas tungsten arc welding is made of

(a) Plastic

(b) Copper

(c) Glass

(d) Ceramic

138 A device used to keep the parts to be welded in proper alignment is called

(a) Welding jig

(b) Welding fixture

(c) Welding positioned

(d) Welding manipulator

139 Small particles which are thrown out by the arc during welding along with

the weld metal is called

(a) Porosity

(b) Spatter

(c) Overlap

(d) Undercut

140 Which one of the following metal or allow has the highest melting point

(a) Aluminium

(b) Copper

(c) Brass

(d) Bronze

141 Spelter is a brazing alloy consisting normally of

(a) 50% cu 50% tn

(b) 50% cu 50% pb

(c) 50% pb 50% tn

(d) 50% cu 50% sn

142 The function of the central hole in the tip of the cutting blow pipe is

(a) Supply oxygen for preheating

(b) Supply acetylene for pre heating

(c) Supply oxygen for cutting

(d) Supply acetylene for cutting

143 Which of the following is not an insulator

(a) Graphite

(b) Glass

(c) Mica

(d) Wood

144 Lack of penetration in arc welding is found due to

(a) High current

(b) Low current

(c) Short arc

(d) Too low welding speed

145 The type of filler metal used in submerged arc welding is

(a) Bare wire

(b) Light coated wire

(c) Heavily coated wire

(d) Enamel coated wire

146 Aluminium is normally cut by

(a) Oxy-Acetylene Flame

(b) Plasma Arc

(c) Hydrogen Arc

(d) Electric Arc

147 ____________ is a brittle material

(a) Aluminium

(b) Cast iron

(c) Copper

(d) Mild steel

148 When two base metals lying in same horizontal plane to be weld is called

(a) Lap joint

(b) Butt joint

(c) Corner joint

(d) Fillet joint

149 When two base metals is perpendicular to each other then the joint is called

(a) Lap joint

(b) Butt joint

(c) Corner joint

(d) Fillet joint

150 When two base metals over laps to each other then the joint is called

(a) Lap joint

(b) Butt joint

(c) Corner joint

(d) Fillet joint

MCQ type Objective Question Bank

Name of the Trade : Welding

Trade Code : WELD

Answer

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40. a41. a42. b43. c44. c45. a46. c47. a48. d49. a50. b51. a52. c53. c54. b55. a56. a57. c58. b59. b60. c61. d62. d63. c64. a65. b66. b67. d68. d69. d70. c71. d72. c73. b74. c75. b76. c77. d78. d

79. c80. b81. c82. a83. b84. c85. c86. b87. a88. d89. c90. d91. a92. a93. d94. c95. c96. c97. b98. b99. d

100. a101. c102. d103. d104. c105. a106. a107. d108. b109. c110. a111. b112. a113. c114. a115. c116. a117. b

118. b119. c120. a121. a122. b123. a124. c125. a126. b127. b128. a129. c130. d131. b132. a133. c134. b135. b136. a137. d138. a139. b140. b141. d142. c143. a144. b145. a146. a147. b148. b149. d150. a