Chapter: Fabrication Processes and Safety
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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