McqMate
Chapters
1. |
Inwhichwelding the surfacesoftwo components are subjected to static normalforce and oscillating shear stress? |
A. | Diffusion welding |
B. | Thermit welding |
C. | Laser beam welding |
D. | Ultrasonic welding |
Answer» D. Ultrasonic welding |
2. |
Electron beam welding is carried out in? |
A. | Inert atmosphere |
B. | Partially filled chamber |
C. | Vacuum |
D. | Partially vacuum |
Answer» C. Vacuum |
3. |
Laser beam weldingis a joining process. |
A. | fission |
B. | fusion |
C. | coherent |
D. | plastic |
Answer» B. fusion |
4. |
Which of the following is used to direct laser beam? |
A. | glass apertures |
B. | perforated glass sheets |
C. | flat optical elements |
D. | electro-magnetic coils |
Answer» C. flat optical elements |
5. |
Inert gas shielding is generally employed to protect _____ |
A. | laser beam |
B. | molten puddle of metal |
C. | filler electrode |
D. | lenses |
Answer» B. molten puddle of metal |
6. |
The lasing material or crystal is excited by _____ |
A. | neon lamps |
B. | krypton lamps |
C. | tungsten wire laps |
D. | CFLs |
Answer» B. krypton lamps |
7. |
Which ofthe following does not holdtrue aboutlaserbeamwelding? |
A. | Laser welding cannot be used in case ofjoints atintricate locations |
B. | It can produce tiny welds |
C. | Laser welding can be used for avariety of metal combinations |
D. | In case of LBW, thin welds on small diameter wires are less susceptible to burn back |
Answer» A. Laser welding cannot be used in case ofjoints atintricate locations |
8. |
Laser welds are not influenced by _____ |
A. | electric field |
B. | magnetic field |
C. | radio waves |
D. | ultraviolet rays |
Answer» B. magnetic field |
9. |
Which of the following material properties has no effect on laser beam machining? |
A. | Reflectivity |
B. | Thermal conductivity |
C. | Weldability |
D. | Electrical conductivity |
Answer» D. Electrical conductivity |
10. |
In oxy-acetylene welding colour of oxygen cylinder is |
A. | Red |
B. | Maroon |
C. | Black |
D. | Brown |
Answer» C. Black |
11. |
In oxy-acetylene welding colour of oxygen cylinder is |
A. | Red |
B. | Maroon |
C. | Black |
D. | Brown |
Answer» B. Maroon |
12. |
In arc welding, arc initiation voltage is of the order |
A. | 20-60V |
B. | 60-100V |
C. | 100-140V |
D. | 140-180V |
Answer» B. 60-100V |
13. |
In arc welding, the three elements to be controlled to obtain satisfactory welding operation are |
A. | Current, voltage and speed of travel |
B. | Current, voltage and arc length |
C. | Current, arc length and speedoftravel |
D. | Voltage, arc length and speed oftravel |
Answer» A. Current, voltage and speed of travel |
14. |
Which welding process is used to join two thick plates in one single pass? |
A. | Oxy-acetylene welding |
B. | Gas tungsten arc welding (TIG) |
C. | Gas metal arc welding (MIG) |
D. | Electroslag welding |
Answer» D. Electroslag welding |
15. |
The followingwelding process is usedtoweldfastener to plateswithout drillingorpunching holes? |
A. | Electroslag welding |
B. | Oxy-acetylene welding |
C. | Butt welding |
D. | Stud welding |
Answer» D. Stud welding |
16. |
The process which employ an exothermal chemical reaction to develop high temperature |
A. | Electroslag welding |
B. | Plasmaarcwelding |
C. | Thermit welding |
D. | Stud welding |
Answer» C. Thermit welding |
17. |
Which process allows fusion welds of great depth with minimum width? |
A. | Electron beam welding |
B. | Ultrasonic welding |
C. | Plasma arc welding |
D. | Friction welding |
Answer» A. Electron beam welding |
18. |
The process of carbon arc welding is not used for which of the following material? |
A. | Copper |
B. | Bronze |
C. | Aluminium |
D. | Iron |
Answer» D. Iron |
19. |
The distance from the center of arc to the tip of electrode is called what? |
A. | Arc distance |
B. | Arc length |
C. | Arccrater |
D. | Arcdepth |
Answer» B. Arc length |
20. |
What is the length of the arc generally? |
A. | 1mm –2mm |
B. | 2mm –3mm |
C. | 3mm – 4mm |
D. | 4mm – 5mm |
Answer» C. 3mm – 4mm |
21. |
With an increase in the heatinput of arcwelding method, how does it affectthewelding speed? |
A. | Increases |
B. | Decreases |
C. | Remains same |
D. | No relation |
Answer» B. Decreases |
22. |
With an increase in the heatinput of arc welding method, how does it affectthe required current? |
A. | Increases |
B. | Decreases |
C. | Remains same |
D. | No relation |
Answer» A. Increases |
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