SPOT Welding Most Important MCQ
 |
| SPOT Welding Most Important MCQ |
What is Spot welding good for the Most Important MCQ ITI and CTI, nimi book
SPOT Welding MCQ 1 to 50
1. Which of the following
units are used to express heat input?
a) Joules
b) N/mm2
c) J/mm2
d) KJ/mm
2. Which of the following
units are used to express current flow?
a) Joules
b) Amperes
c) Ohms
d) Seconds
3. Which of the following
units are used to express electric resistance?
a) Joules
b) Amperes
c) Ohms
d) Seconds
4. Which of the following welding processes is used for welding sheet metals in
automobile and aircraft
industries?
a) Shield metal arc welding
b) Gas tungsten arc welding
c) Thermit welding
d) Resistance welding
5. Which of the following the welding process is used for welding sheet metals in
automobile and aircraft
industries?
a) Shield metal arc welding
b) Resistance welding
c) Gas tungsten arc welding
d) Gas metal arc welding
6. In what basic way does
resistance welding differ from arc welding?
a) No arc is produced
b) No extra is added
c) Heat is produced by the resistance offered by the workpiece
d) All of the above
7. The heat generated (H) in
resistance welding is expressed by
a) I 2Rt
b) IR2t
c) IRt2
d) 2IRT
8. Which of the following is
not a resistance welding?
a) Spot welding
b) Flash Butt welding
c) Projection welding
d) Thermit welding
9. The voltage needed in
resistance welding does not depend upon
a) Composition
b) Area
c) Thickness of weld
d) Length of weld
10. In electric resistance
welding…
a) Voltage is high &
current is low
b) Voltage is low &
current is high
c) Both voltage &
current is high
d) Both voltage &
current is low
10. In electric resistance
welding, two copper electrodes used are cooled by…
a) Water
b) Air
c) Both A & B
d) None of the above
11. Electrodes used for spot
welding are of many shapes & sizes, the most common is…
a) Beveled tip
b) Flat tip
c) Centre tip
d) None of the above
11. All spot welding
machines have three basic components, which are these components?
a) Mechanism to apply
pressure
b) Electrical transformer
circuit
c) Timing system to control
the duration of the flow of current
d) All of the above
12. The main disadvantage of
spot welding is…
a) It leaves slight
depression on the weld metal
b) It is not highly
economical
c) Welding rate is low
d) Produces large heat
affected zone
13. What type of resistance the welding process is used for attaching fasteners to structural
members?
a) Spot welding
b) Seam welding
c) Butt welding
d) Projection welding
14. When two pieces of
different metals are to be welded by projection welding, then the
projection should be made on
a) Thinner metal piece
b) Thicker metal piece
c) On both the plates
d) None of these
15. When two pieces of
different metals are to be welded by projection welding, then the
projection should be made on
the metal piece with
a) Higher conductivity
b) Lower conductivity
c) Higher ductility
d) None of the above
15. Projection welding is a
a) Continuous spot welding
process
b) Multi-spot welding
process
c) Arc welding process
d) Process used for joining
round bars
16. Seam welding is a
a) Continuous spot welding
process
b) Multi-spot welding
process
c) Arc welding process
d) Process used for joining
round bars
17. In which of the
following the resistance welding process, electrodes of two copper wheels
are used
a) Projection welding
b) Seam welding
c) Flash welding
d) Spot welding
18. What is a “Nugget “in
resistance welding?
a) Fusion zone
b) Base metal
c) Pressure load
d) Current
19. Which metals are not
possible to weld by projection welding?
a) Aluminium
b) Nickel alloys
c) Carbon see l alloys
d) Copper & brass
20. In resistance welding,
if the current is doubled, the heating effect becomes:
a) Double
B) Four times
c) Eight times
d) Sixteen times
21. The important factors,
which affects the quality of spot weld is…
a) Welding current
b) Electrode pressure
c) Duration of current flow
d) All of the above
23. Name the two resistance
welding processes are shown in fig…
a) Spot welding &
Seaming Welding
b) Projection Welding &
Butt welding
c) Projection welding &
seam welding
d) Seaming welding &
flash butt welding
24. The main qualities a good spot welding electrode is
a) Highly strong
b) Wear-resistant
c) High electrical
conductivity
d) All of the above
25. In spot welding, the
size of the nugget is controlled by…
a) Time
b) Current
c) Pressure
d) Electrode contact area
26. Which is the following statement is true regarding spot welding?
a) It is also known as multi
spot welding process
b) It can be produced by
either a continuous or intermittent method of operation
c) It is not possible to
obtain airtight welding
d) All of the above
27. In intermittent seam
welding method, the electrode…
a) rotate at a constant
speed
b) rotate for fixed angle
c) rotate at a high speed
d) rotate at a low speed
28. Which type of welding is
suitable for square butt joint in thin section?
a) Spot welding
b) Butt seam welding
c) Projection welding
d) Upset welding
29. Welding of copper in
spot welding is difficult because of it...
a) High ductility
b) High toughness
c) High electrical
conductivity
d) High thermal conductivity
30. Hollow electrodes are
used in spot welding because…
a) To reduce cost
b) To circulate water
c) To reduce weight
d) To reduce material
resistance
31. Which type of resistance the welding machine is used for the continuous welding process?
a) Butt welding machine
b) Spot welding machine
c) Projection welding
machine
d) Seam welding machine
32. Depends on what, current the setting is set in resistance spot welding?
a) Size of overlapping
b) Duration of current flow
c) Number of spots to be
made
d) Thickness of sheet to be
welded
33. The welding pressure in
resistance welding increases than current and time must
a) Decreases
b) Increases
c) Remains same
d) None of the above
34. What is the maximum the temperature of weld zone in spot welding?
a) 750°C - 900°C
b) 900°C - 1200°C
c) 1500°C - 1700°C
d) 1800°C - 2100°C
35. Welding time in
resistance welding depends upon
a) Rate of pressure
b) Rate of heat
generation/dissipation
c) Rate of temperature
d) All of the above
36. In projection welding,
the depth of projection is about:
a) 20% of sheet thickness
b) 40% of sheet thickness
c) 60% of sheet thickness
d) 80% of sheet thickness
37. In spot welding, the tip diameter of the electrode is about…
a) √t
b) √2t
c) 2√t
d) √3t
38. In spot welding, the
spacing between two spot welds is…
a)4t
b) 8t
c) 12t
d) 16t
39. In spot welding, two
electrodes are made of
a) Aluminum
b) Copper
c) Iron
d) Bronze
40. A seam weld can be
produced by…
a) Continuous method of
operation
b) Intermittent method of
operation
c) either continuous or
intermittent method of operation
d) none of the above
41. Show the welding symbol
used for indicating spot welding?
42. What is the name of the weld
shown in the resistance welding process?
a) Butt/upset welding
b) Flash butt welding
c) Projection welding
d) Seam welding
43. What is the name of the weld
shown in the resistance welding process?
a) Butt/upset welding
b) Flash butt welding
c) Projection welding
d) Seam welding
44. The letterbox body shown
is going to be made from galvanized steel sheets and will be
mass-produced. What is the
best method of joining seam A?
a) EBW
b) Spot welding
c) MIG welding
d) SAW
45. Butt upset welding
differs from flash welding, in that there is no arcing between
the surfaces being joined.
This statement is true or false.
a) True
b) False
c) Either true or false
d) None of the above
46. Welding of copper in the resistance welding process is difficult because of its…
a) High thermal conductivity
b) High electrical
conductivity
c) High toughness
d) High ductility
47. Which of the following the resistance welding machine is used to join pipe sections end to
end?
a) Projection welding
b) Spot welding
c) Seam welding
d) Butt welding
48. Which welding process is
similar to projection welding?
a) Submerged arc welding
b) Flash butt welding
c) Spot welding
d) Seam welding
49. Brass & copper
cannot be projection welded because…
a) It is hazardous to welder
b) Projection collapse under
pressure
c) Making projection is
difficult on it
d) Both a & c
