-
question_answer1)
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is:
A)
Less than 0.1 percent done
clear
B)
Less than 0.3 percent done
clear
C)
More than 0.3 percent done
clear
D)
Anywhere between 0.1 to 1.0 percent done
clear
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question_answer2)
Weld spatter occurs due to any of the following except:
A)
High welding current done
clear
B)
Too small an electrode done
clear
C)
Are done
clear
D)
Wrong polarity done
clear
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question_answer3)
Thick steel plate cut with oxygen normally shows signs of cracking. This tendency for cracking can be minimized by:
A)
Slow speed cutting, done
clear
B)
Cutting in two or more stages done
clear
C)
Preheating the plate done
clear
D)
Using oxy-acetylene flame done
clear
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question_answer4)
Electron beam welding can be carried out in:
A)
Open air done
clear
B)
A shielding gas environment done
clear
C)
A pressurized inert gas chamber done
clear
D)
Vacuum done
clear
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question_answer5)
Which one of the following welding processes uses non-consumable electrodes?
A)
TIG welding done
clear
B)
MIG welding done
clear
C)
Manual arc welding done
clear
D)
Submerged arc welding done
clear
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question_answer6)
Match List-1 with List-11 and Select the correct answer using the codes given below the Lists:
List-I (Filler) | List-II (Joining process) |
A. | Cu, Zn, Ag alloy | 1. | Braze welding |
B. | Cu, Sn alloy | 2. | Brazing |
C. | Pb, Sb alloy | 3. | Soldering |
D. | Iron oxide and aluminium powder | 4. | TIG welding of aluminium. |
Codes:
A)
A\[\to \]4, B\[\to \]1, C\[\to \]4, D\[\to \]2 done
clear
B)
A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 done
clear
C)
A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 done
clear
D)
A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 done
clear
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question_answer7)
Consider the following statements:
MIG welding process uses |
1. Consumable electrode |
2. Non-consumable electrode |
3. D. C power supply |
4. A. C power supply. |
Of these statements:
A)
2 and 4 are correct done
clear
B)
2 and 3 are correct done
clear
C)
1 and 4 are correct done
clear
D)
1 and 3 are correct done
clear
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question_answer8)
In oxy-acetylene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is:
A)
1 done
clear
B)
1.5 done
clear
C)
2 done
clear
D)
2.5 done
clear
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question_answer9)
Small amount of carbonaceous material sprinkled on the inner surface of mould cavity is called:
A)
Backing sand done
clear
B)
facing sand done
clear
C)
Green sand done
clear
D)
dry sand done
clear
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question_answer10)
The voltage-current characteristics of a DC generator for arc welding is a straight line between an open-circuit voltage of 80 V and short-circuit current of 300 A. The generator settings for maximum arc power will be:
A)
80 V and 150 A done
clear
B)
40 V and 300 A done
clear
C)
40 V and 150 V done
clear
D)
V and 300 A done
clear
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question_answer11)
Which of the following joining processes are best suited for manufacturing pipes to carry gas products?
1. Rivetting |
2. Welding |
3. Bolts and nuts |
Select the correct answer using the codes given below: |
Codes:
A)
1 and 2 done
clear
B)
1 and 3 done
clear
C)
2 alone done
clear
D)
1, 2 and 3 done
clear
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question_answer12)
The correct sequence of the given materials ascending order of their weldability is:
A)
MS, copper, cast iron, aluminium done
clear
B)
Cast iron, MS, aluminium copper done
clear
C)
Copper, cast iron, MS, aluminium done
clear
D)
Aluminium, copper, cast iron, MS done
clear
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question_answer13)
Which one of the following statements is correct?
A)
No flux is used in gas welding of mild steel done
clear
B)
Borax is the commonly used flux coating welding electrodes done
clear
C)
Laser beam welding employs a vacuum chamber and thus avoids use of a shielding method done
clear
D)
AC can be used for GTAW process done
clear
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question_answer14)
Consider the following processes
1. Gas welding |
2. Thermit welding |
3. Arc welding |
4. Resistance welding |
The correct sequence of these processes in increasing order of their welding temperatures is:
A)
1, 3, 4, 2 done
clear
B)
1, 2, 3, 4 done
clear
C)
4, 3, 1, 2 done
clear
D)
4, 1, 3, 2 done
clear
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question_answer15)
Which of the following statements is/arc correct in respect of welding of two pieces in upset welding?
1. The ends to be welded should touch each other before current is switched |
2. The ends to be welded should touch each other after current is switched on. |
3. The two pieces have to be pressed together after desired welding temperature is reached. |
Select the correct answer using the code given below:
A)
1 only done
clear
B)
1 and 3 done
clear
C)
2 only done
clear
D)
2 and 1 done
clear
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question_answer16)
Arc blow is more common in:
A)
a.c. welding done
clear
B)
d.c. welding with straight polarity done
clear
C)
d.c. welding with bare electrods done
clear
D)
a.c. welding with bare electrodes. done
clear
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question_answer17)
Pinch effect in welding is the result of:
A)
Expansion of gases in the arc done
clear
B)
Electromagnetic forces done
clear
C)
Electric force done
clear
D)
Surface tension of the molten metal done
clear
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question_answer18)
In manual arc welding, the equipment should have drooping characteristics in order to maintain the:
A)
Voltage constant when arc length changes done
clear
B)
Current constant when arc length changes done
clear
C)
Temperature in the arc constant done
clear
D)
Weld pool red-hot done
clear
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question_answer19)
In are welding D.C. reverse polarity is used to bear greater advantage in:
A)
Overhead welding done
clear
B)
Flat welding of lap joints done
clear
C)
Edge welding done
clear
D)
Flat welding of butt joints done
clear
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question_answer20)
Oxyacetylene reducing flame is used while carrying out the welding on:
A)
Mild Steel done
clear
B)
High carbon steel done
clear
C)
Grey cast iron done
clear
D)
Alloy steels done
clear
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question_answer21)
Which one of the following welding techniques in vacuum environment required?
A)
Ultrasonic welding done
clear
B)
Laser beam welding done
clear
C)
Plasma arc welding done
clear
D)
Electron beam welding done
clear
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question_answer22)
Consider the following statements:
1. in arc welding, 65% to 75% heat is generated the anode. |
2. Duty cycle in case of arc welding is the cycle of complete-welding of work piece from the beginning. |
3. Arc blow is more common with DC welding. |
Which of the statements given above are correct?
A)
1, 2 and 3 done
clear
B)
1 and 2 done
clear
C)
2 and 3 done
clear
D)
1 and 3 done
clear
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question_answer23)
Hot cracks occur in the weld and fusion zone as die metal solidifies. Which of the following are the causes for hot cracks?
1. Presence of sulphur and phosphorous for hot cracks. |
2. High carbon or alloy content of the base metal. |
3. Moisture in the joint or electrode. |
4. Joint restraint. |
Select the correct answer using the code given below:
A)
1, 2 and 4 done
clear
B)
1, 2 and 3 done
clear
C)
3 and 4 done
clear
D)
1, 2, 3 and 4 done
clear
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question_answer24)
In atomic hydrogen welding hydrogen acts as:
A)
A heating agent done
clear
B)
One of the gases to generate the flame done
clear
C)
An effective shielding gas protecting the weld done
clear
D)
A lubricant to increase the flow characteristics of weld metal. done
clear
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question_answer25)
Which of the following are the major characteristics of submerged arc welding?
1. High welding speeds |
2. High deposition rates |
3. Low penetration |
4. Low cleanliness |
Select the correct answer using the code given below:
A)
2 and 3 done
clear
B)
1, 2 and 3 done
clear
C)
3 and 4 done
clear
D)
1 and 2 done
clear
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question_answer26)
Consider the following statements:
1. In gas welding, the torch should be held at an angle of \[30{}^\circ \] to \[45{}^\circ \] from the horizontal plane |
2. In gas welding, the size of the torch depends upon the thickness of metal to be formed |
3. Drag in gas cutting is the time difference between heating of the plate and starting the oxygen gas for cutting. |
Which of the statements given above are correct?
A)
1, 2 and 3 done
clear
B)
1 and 2 done
clear
C)
2 and 3 done
clear
D)
1 and 3 done
clear
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question_answer27)
In which of the following welding processes, flux is used in the form or granules?
A)
AC arc welding done
clear
B)
Submerged arc welding done
clear
C)
Argon arc welding done
clear
D)
DC arc welding done
clear
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question_answer28)
Which one of the following is not a fusion welding process?
A)
Gas welding done
clear
B)
Arc welding done
clear
C)
Brazing done
clear
D)
Resistance welding done
clear
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question_answer29)
Fabrication weldability test is used to determine:
A)
Mechanical properties required for satisfactory performance of welded joint done
clear
B)
Susceptibility of welded joint for cracking done
clear
C)
Suitability for joint design done
clear
D)
Appropriate machining process. done
clear
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question_answer30)
Which one of the following welding processes consists of minimum heat effected zone (HAZ)?
A)
Shielded Metal Arc Welding (SWAW) done
clear
B)
Laser Beam Welding (L3BW) done
clear
C)
Ultrasonic Welding (USW) done
clear
D)
Metal Inert Gas Welding MIG) done
clear
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question_answer31)
Match List-I (Welding problems) with List-II (Causes) and select the correct answer using the codes given below the list:
List-I (Welding problems) | List-II (Causes) |
A. | Spatter | 1. | Damp electrodes |
B. | Distortion | 2. | Arc blow |
C. | Porosity | 3. | Improper cleaning in multipass welding |
D. | Poor joint selection | 4. | Poor joint selection |
Codes:
A)
A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 done
clear
B)
A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 done
clear
C)
A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 done
clear
D)
A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 done
clear
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question_answer32)
High speed electron beam of electron beam welding is focused on the weld spot using:
A)
Vacuum lens done
clear
B)
inert gas lens done
clear
C)
Optical lens done
clear
D)
magnetic lens done
clear
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question_answer33)
In resistance welding, heat is generated due to the resistance between:
A)
Electrode and work piece done
clear
B)
Asperities between touching plates done
clear
C)
Two dissimilar metals being in contact done
clear
D)
Interatomic forces. done
clear
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question_answer34)
Match List-I (Welding problems) with List-II (Causes) and select the correct answer using the codes given below the list:
List-I | List-II |
A. | Cracking of weld | 1. | Excessive metal stresses |
B. | Cracking of base | 2. | High joint metal rigidity |
C. | Porosity | 3. | Oxidation |
D. | Inclusions | 4. | Excessive \[{{H}_{2}},{{O}_{2}},{{N}_{2}}\] in the welding atmosphere |
Codes:
A)
A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 done
clear
B)
A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 done
clear
C)
A\[\to \]2, B\[\to \]4, C\[\to \]2, D\[\to \]1 done
clear
D)
A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 done
clear
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question_answer35)
Consider the following statement:
The magnitude of residual stresses in welding depends upon |
1. Design of welding |
2. Support and clamping of components |
3. Welding process used. |
Which of the statements given above are correct?
A)
1 and 2 done
clear
B)
1, 2 and 3 done
clear
C)
1 and 3 done
clear
D)
2 and 3 done
clear
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question_answer36)
Consider the following statements in respect of oxydiacetylene welding:
1. The joint is not heated to a state of fusion. |
2. No pressure is used. |
3. Oxygen is stored in steel cylinder at a pressure of 14 MPa |
4. When there is an excess of acetylene used, there is decided change in the appearance of flame. |
Which of the statements given above are correct?
A)
1, 2 and 3 done
clear
B)
2, 3 and 4 done
clear
C)
1, 3 and 4 done
clear
D)
1, 2 and 4 done
clear
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question_answer37)
The coating material of an arc welding electrode contains which of the following?
1. Deoxidising agent, |
2. Arc stabilizing agent. |
3. Slag forming agent |
Select the correct answer using the code given below
A)
1, 2 and 3 done
clear
B)
1 and 2 only done
clear
C)
2 and 3 only done
clear
D)
1 and 3 only done
clear
View Solution play_arrow
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question_answer38)
In MIG welding, the metal is transferred into the form of which one of the following?
A)
A fine spray of metal done
clear
B)
Molten drops done
clear
C)
Weld pool done
clear
D)
Molecules done
clear
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question_answer39)
Consider the following statements in respect of the laser beam welding:
1. It can be used for welding any metal or their combinations because of very high temperature of the focal points. |
2. Heat affected zone is very large because of quick heating. |
3. High vacuum is required to carry the process. |
Which of the statements given above is/are correct?
A)
1 and 2 only done
clear
B)
2 and 3 only done
clear
C)
1 only done
clear
D)
1, 2 and 3 done
clear
View Solution play_arrow
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question_answer40)
Which of the following effects are possible due to residual stresses in welding?
1. Reduce dimensional stability |
2. Weld cracking |
3. Effect on fatigue strength |
4. Reduction in the creep strength |
Select the correct answer using the code given below:
A)
1 and 2 only done
clear
B)
2 and 3 only done
clear
C)
1 and 3 only done
clear
D)
1, 2, 3 and 4 done
clear
View Solution play_arrow
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question_answer41)
Assuming a straight line V\[-\]I characteristics for a DC welding generator, short-circuit current as 400 A and open circuit voltage as 100 V, which one of the following is the correct voltage and current setting for maximum arc power?
A)
400 A and 100 V done
clear
B)
200 A and 100 V done
clear
C)
400 A and 50 V done
clear
D)
200 A and 50 V done
clear
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question_answer42)
Open-circuit voltage of 60V and current of 160 A were the welding conditions for arc welding of a certain class of steel strip of thickness 10 mm. For arc welding of 5 mm thick strip of the same steel, the welding voltage and current would be:
A)
60 V and 80 A done
clear
B)
120 V and 160 A done
clear
C)
60V and 40 A done
clear
D)
120V and 40 A done
clear
View Solution play_arrow
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question_answer43)
Match List-I (Shielding method) with List-II (Welding process) and select the correct answer using the codes given below the lists:
List-I | List-II |
A. | Flux coating | 1. | Gas metal arc welding |
B. | Flux granules | 2. | submerged arc welding |
C. | \[C{{O}_{2}}\] | 3. | Shielded metal arc welding |
D. | Vacuum | 4. | Laser beam welding |
| 5. | Electron beam welding |
Codes:
A)
A\[\to \]1, B\[\to \]2, C\[\to \]5, D\[\to \]3 done
clear
B)
A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]5 done
clear
C)
A\[\to \]3, B\[\to \]5, C\[\to \]1, D\[\to \]4 done
clear
D)
A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]5 done
clear
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question_answer44)
Consider the following welding processes:
1. TIG welding |
2. Submerged arc welding |
3. Electro-slag welding |
4. Thermit welding. |
Which of these welding processes are used for welding thick pieces of metals?
A)
1, 2 and 3 done
clear
B)
1, 2 and 4 done
clear
C)
1, 3 and 4 done
clear
D)
2, 3 and 4 done
clear
View Solution play_arrow
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question_answer45)
Match List-I (Welding processes) with List-II (Features) and select the correct answer using the codes given below the Lists:
List-I | List-II |
A. | Ultrasonic welding | 1. | Gas heated to ionized condition for conduction of electric current |
B. | Plasma arc welding | 2. | High frequency and high intensity vibrations |
C. | Plasma arc welding | 3. | Concentrated steam of high-energy Electrons |
| 4. | Exothermal chemical reaction |
Codes:
A)
A\[\to \]1, B\[\to \]2, C\[\to \]4 done
clear
B)
A\[\to \]4, B\[\to \]3, C\[\to \]1 done
clear
C)
A\[\to \]2, B\[\to \]1, C\[\to \]4 done
clear
D)
A\[\to \]2, B\[\to \]3, C\[\to \]1 done
clear
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question_answer46)
Two plain carbon steel specimens having 0.8% carbon content are weld. If we observe the weldment under Metallurgical Microscope from centre towards either side, the following structures are observed at different zones:
1. Fine Pearlite |
2. Coarse Pearlite |
3. Martensite |
Select the correct sequence using the codes given below: |
Codes:
A)
1, 2, 3 done
clear
B)
1, 3, 2 done
clear
C)
2, 1, 3 done
clear
D)
3, 1, 2 done
clear
View Solution play_arrow
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question_answer47)
Match List-I (Welding) with List-II (Application) and select the correct answer using the codes given below the Lists:
List-I (Welding) | List-II (Application) |
A. | Explosive | 1. | Joining thick sheets |
B. | Ultrasonic | 2. | Manufacture of heat exchanges |
C. | Thermite | 3. | Joining thin sheets or wires of similar/dissimilar metals |
D. | Projection | 4. | Joining hydraulic piston rods heat for agricultural Machinery |
| | 5. | Joining rails, pipes and thick steel sections |
Codes:
A)
A\[\to \]2, B\[\to \]5, C\[\to \]1, D\[\to \]3 done
clear
B)
A\[\to \]4, B\[\to \]5, C\[\to \]1, D\[\to \]3 done
clear
C)
A\[\to \]2, B\[\to \]3, C\[\to \]5, D\[\to \]1 done
clear
D)
A\[\to \]4, B\[\to \]3, C\[\to \]5, D\[\to \]1 done
clear
View Solution play_arrow
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question_answer48)
Preheating before welding is done to:
A)
Make the steel softer done
clear
B)
Bum away oil, grease, etc. from the plate surface done
clear
C)
Prevent cold cracks done
clear
D)
Prevent plate distortion done
clear
View Solution play_arrow
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question_answer49)
Which one of the following is not an electric resistant method of welding?
A)
Electro slag welding done
clear
B)
Percussion welding done
clear
C)
Seam welding done
clear
D)
Flash welding done
clear
View Solution play_arrow
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question_answer50)
Which one of the following welding processes consists of similar Heat Affected Zone (HAZ)?
A)
Arc welding done
clear
B)
Electron beam welding done
clear
C)
MIG welding done
clear
D)
Thermite welding done
clear
View Solution play_arrow
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question_answer51)
Which of the following gases can be used for GMAW as a shielding gas?
1. Argon |
2. Oxygen |
3. Carbon dioxide |
Select the correct answer using the code given below:
A)
1, 2 and 3 done
clear
B)
1 and 2 done
clear
C)
2 and 3 done
clear
D)
1 and 3 done
clear
View Solution play_arrow
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question_answer52)
In which one of the following welding techniques is vacuum environment required?
A)
Plasma arc welding done
clear
B)
Laser beam welding done
clear
C)
Electron beam welding done
clear
D)
Ultrasonic welding done
clear
View Solution play_arrow
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question_answer53)
Consider the following welding processes
1. Arc welding |
2. MIG welding |
3. Laser beam welding |
4. Submerged arc welding |
Select the correct sequence in increasing order of Heat Affected Zone (HAZ) using the code given below:
A)
\[1-2-3-4\] done
clear
B)
\[1-4-2-3\] done
clear
C)
\[3-2-4-1\] done
clear
D)
\[4-3-2-1\] done
clear
View Solution play_arrow
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question_answer54)
Consider the following statements in respect of double sampling plan:
1. Average number of pieces inspected is double that of single sampling. |
2. Average number of pieces inspected is less than that for single sampling |
3. Decision to accept or reject the lot is taken only after the inspection of both samples |
4. Decision to accept or reject the lot is reached sometime after one sample and sometimes after two samples. |
Which of the statements are correct?
A)
1, 2 and 3 done
clear
B)
2 and 4 done
clear
C)
1 and 4 done
clear
D)
2 and 3 done
clear
View Solution play_arrow
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question_answer55)
Consider the following fits:
1. I.C engine cylinder and piston |
2. Ball bearing outer race and housing |
3. Ball bearing inner race and shaft |
Which of the above fits are based on the shaft basis system?
A)
1 and 2 done
clear
B)
2 and 3 done
clear
C)
1 and 3 done
clear
D)
1, 2 and 3 done
clear
View Solution play_arrow
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question_answer56)
Match List I (Quality control concepts) with List II (Quality control techniques) and select the correct answer using the codes given below the lists:
List-I (Quality control concepts) | List-II (Quality control techniques) |
A. | Tightened and reduced inspection | 1. | Dodge roming tables |
B. | Lot tolerance percent defective | 2. | Control chart for variables |
C. | Poisson distribution | 3. | MIL standards |
D. | Normal distribution | 4. | Control chart for number of non-conformities |
Codes:
A)
A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 done
clear
B)
A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 done
clear
C)
A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]3 done
clear
D)
A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]2 done
clear
View Solution play_arrow
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question_answer57)
Quality control chart for averages was maintained for a dimension of the product. After the control was established, it was found that the standard deviation of the process was 1.00 mm. The dimension of the part is \[70\text{ }\pm \text{ }2.5\] mm. Parts above 725 mm can be reworked but parts below 67.5 mm have to be scrapped. What should be the setting of the process to ensure production of no scrap and to minimize the rework?
A)
68.5 mm done
clear
B)
70 mm done
clear
C)
70.5 mm done
clear
D)
725 mm done
clear
View Solution play_arrow
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question_answer58)
Consider the following statements with respect to control charts for attributes:
1. The lower control limit is non-negative |
2. Normal distribution is the order for this data |
3. The lower control limit is not significant |
4. These charts give the average quality characteristics |
Which of the statements given above are correct:
A)
1, 2 and 3 done
clear
B)
2, 3 and 4 done
clear
C)
1, 3 and 4 done
clear
D)
1, 2 and 4 done
clear
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question_answer59)
Which one of the following statements is not correct?
A)
The operating characteristic curve of acceptance sampling plan shows the ability of the plan to distinguish between good and bad lots done
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B)
No sampling plan can give complete protection against the acceptance of defective products done
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C)
C chart has straight line limits and U chart has zig-zag limits done
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D)
Double sampling result in more inspection than single sampling if the incoming quality is very bad done
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question_answer60)
Consider the following statements:
A nomenclature \[\phi \,50\,H8/p8\] denoted that |
1. Hole diameter is 50 mm |
2. It is a shaft base system |
3. 8 indicates fundamental deviation. |
Which of the statements given above is/are correct
A)
1, 2 and 3 done
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B)
1 and 2 only done
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C)
1 and 3 only done
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D)
3 only done
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question_answer61)
Consider an activity having a duration time \[{{T}_{\text{ij}}}\] E it the earliest occurrence time and L latest occurrence time (see figure given)
|
Consider the following statements in this regard: |
1. Total float \[V\text{ }=\text{ }60\text{ }V,\] |
2. Free float \[={{E}_{j}}-{{E}_{i}}{{t}_{ij}}\] |
3. Slack of the tail event \[={{L}_{j}}-{{E}_{i}}\] |
Of these statements:
A)
1, 2 and 3 are correct done
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B)
1 and 2 are correct done
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C)
1 and 3 are correct done
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D)
2 and 3 are correct done
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question_answer62)
For the network shown in the given Fig. earliest expected completion time of the project is?
A)
26 days done
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B)
27 days done
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C)
30 days done
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D)
indeterminable done
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question_answer63)
In the network shown below in figure, the critical path is along
A)
\[1-2-3-4-8-9\] done
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B)
\[1-2-3-5-6-7-8-9\] done
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C)
\[1-2-3-4-7-8-9\] done
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D)
\[1-2-5-6-7-8-9\] done
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