MCQ type practice paper question set-1 ( welder trade theory)

 

1. Activity to join two similar metals with same filler metal is called_____.

A) Autogeneous welding
B) Heterogeneous welding
C) Fusion welding
D) Pressure welding

ANSWER= (C) Fusion welding

 

2. Process of melting of base metal & filler metal togther is called____.

A) Fusion        
B) Forge
C) Solid
D) Arc

ANSWER=

 

3. IZOD and CHARPY machine are related to ___ test.

A) Impact
B) Bending
C) Fatigue
D) Tensile

ANSWER= (A) Impact

 

4. Which of the following defect is due to high current?.

A) Over-lap
B) Under-cut
C) Blow hole
D) Slag deposition

ANSWER= (B) Under-cut

 

5. Which type of electrode is used in TIG welding?

A) Tungsten
B) Iron
C) Bronze
D) Aluminium

ANSWER= (A) Tungsten

 

6. By which methode ferrous and non-ferrous metals are welded easily?

A) Metal inert gas welding
B) Resistance welding
C) Tungsten inert gas welding
D) Hydrogen Arc welding

ANSWER= (C)

 

7. Which metal electrode is used in spot welding?

A) Steel
B) Copper
C) Alloy
D) None of these

ANSWER= (B) Copper

 

8. Type of but welding are____?

A) up-set
B) Flush-butt
C) Both (A) & (B)
D) None of these

ANSWER= (C) Both (A) & (B)

 

9. What happen to melting point of steel when carbon % increases in steel?

A) Reduces
B) Increase
C) Unchanged
D) None of these

ANSWER= (A) Reduces

 

10. What type of thread oxygen cylinder has?

A) Right handed
B) Left handed
C) Rectangular
D) Twisted

ANSWER= (A) Right handed

 

11.How far torch is kept from job during welding in MIG welding?

A) 5-10 mm
B) 10-12 mm
C) 10-15 mm
D) 15-20 mm

ANSWER=

 

12. What is the type of weld bead?

A) Plane
B) Convex
C) Concave
D) All of these

ANSWER= (D) All of these.

 

13. What is the type of joit? 

                                          

A) Single V
B) Single U
C) Double V
D) Double U

ANSWER= (A) Single V

 

14. Which of the following is a type of destructive test?

A) Ultrasonic
B) Radiography
C) Tensile
D) Micrography

ANSWER= (C) Tensile

 

15. What is carbon percentage in dead mild steel?

A) 0.10 to 1.5 %
B) 0.10 to 0.15 %
C) 0.15 to 0.30 %
D) None of these

ANSWER= (B) 0.10 to 0.15 %

 

16. What is joined by stud welding?

A) Pin
B) Bolt
C) Rod
D) All of these

ANSWER= (D) All of these

 

17. In Electron beam welding Filament used is made of ____ metal.

A) Tungsten
B) Alloy steel
C) Both (A) & (B)
D) None of these

ANSWER= (A) Tungsten

 

18. Which welding is done in robotic welding?

A) TIG
B) MIG
C) Both (A) & (B)
D) None of these

ANSWER= (C)

 

19. GATW is____.

A) Gas tungsten arc welding
B) Gas tungsten argon welding
C) Gas titanium welding
D) None of these

ANSWER= (A) Gas tungsten arc welding

 

20. Which method of welding is used in manufacturing of Tank etc?

A) Electro-slag welding
B) Laser beam welding
C) Ultrasonic welding
D) Plasma arc welding

ANSWER=

 

21. In MIG welding, used inert gas name is____.

A) CO₂
B) NH₃
C) C₂H₂
D) H₂

 ANSWER= (A) CO2

 

22. As per IS: 815-1956 first digit indicates_____.

A) Type of flux
B) Position of welding
C) Amount of current
D) % increase

ANSWER=

 

23. Scattered small particle due to arc is called___.

A) Slag
B) Weld metal
C) Stub
D) Spatter

ANSWER= (D) Spatter

 

24. In electron beam welding, to eleminate the defect "porosity" which has to be adjusted?

A) Spot size
B) Deflection
C) Weld penetration
D) Focal position/focus current

ANSWER= (D) Focal position/focus current

 

25. Which one among the following processes has the highest joining efficiency?

A) Oxy-acetylene welding
B) Manual metal arc welding
C) Submerged arc welding
D) Electron beam welding

ANSWER=

 

26. Which one of the following tests makes use of sound waves?

A) Radiographic test
B) Ulrasonic test
C) Dye penetrant test
D) Magnetic particle test

ANSWER= (B) Ultrasonic test

 

27. Gamma rays are produced by_____.

A) Iridium
B) Cobalt 60
C) Titanium
D) Tungsten

ANSWER= (B) Cobalt 60

 

28. Which welding process is similar to projection welding?

A) Submerged arc welding
B) Flash butt welding
C) Spot welding
D) Seam welding

ANSWER= (C) Spot welding

 

29. Which one of the following DC power sources is to be selected for electro slag welding process?

A) Constant current power source
B) Variable voltage power source
C) Constant voltage power source
D) Variable current power source

ANSWER= (C)

 

30. Friction welding is suitable to weld____.

A) Rectangular jobs
B) Square jobs
C) Circular jobs
D) Irregular jobs

ANSWER= (C) Circular jobs

 

31. What is the size of gas nozzle for 1.5 mm diameter tungsten electrode in TIG welding process?

A) 10 mm dia
B) 12 mm dia
C) 14 mm dia
D) 16 mm dia

ANSWER= (A) 10 mm dia

 

32. Which one of the low heat input electrode used to cast iron for repair work?

A) monel electrode
B) Tungsten electrode
C) Low hydrogen electrode
D) Silicon bronze electrode

ANSWER= (D) Silicon bronze electrode

 

33. What is the melting point of the filler metals used in soldering?

A) above 816 degree 
B) below 427 degree 
C) above 427 degree 
D) below 102 degree 

ANSWER= (B) below 427 degree

 

34. The impured acetylene gas enters the purifier at the bottom and passes through three compartments. What is the first compartment contains in the purifier?

A) purifying material
B) pumice stone
C) filter wool
D) water

ANSWER= (B) pumice stone

 

35. The weld symbol 'O' is used to denote_____.

A) Seam weld
B) Spot weld
C) Projection weld
D) Flash butt weld

ANSWER= (B) Spot weld

 

36. In which non-destructive test Electricity is not required,_____

A) X- ray test
B) Ultrasonic test
C) Dye penetrant test
D) Hydraulic pressure test

ANSWER= (C) Dye penetrant test

 

37. What is thermit reaction time?

A) 4-6 seconds
B) 7-10 seconds
C) 11-13 seconds
D) 14-17 seconds

ANSWER= (B) 7-10 seconds

 

38. The melting point of tungsten is about____.

A) 2600°
B) 3000°
C) 3400°
D) 3800°

ANSWER= (C) 3400°

 

39. The slag formed in thermit welding is_____.

A) FeO
B) Fe2O3
C) Al
D) Al2O2

ANSWER= (B) Fe2O3

 

40. In friction welding the stationary part is to____.

A) Rotate
B) Be idle
C) Move to and fro
D) Move up and down

ANSWER= (C) Move to and fro