ONLINE MCQ EE-ELECTRIC WELDING 4

ONLINE MCQ EE-ELECTRIC WELDING 4

Q31. In which of the following methods of welding the molten metal is poured for joining the metals ?

A.  Thermit welding
B.  Gas welding.
C.  TIG welding
D.  Arc welding

Ans. A

Q32. The welding of aluminium alloy entails which of the following problems ?

A.  High tlermal conductivity quick dissipating heat
B.  On melting becomes thin liquid- tendency to run off
C.  Low specific resistance requiring heavy current
D.  All of the above

Ans. D

ONLINE MCQ EE-ELECTRIC WELDING 4

Q33. TIG welding is

A.  thorium iodine gas welding
B.  thermally induced gas welding
C.  temperature insulated gas welding
D.  tungsten inert gas welding

Ans. D

Q34. In ultrasonic welding the frequency range is generally

A.  2000 to 3000 Hz
B.  4000 to 20000 Hz
C.  30000 to 40000 Hz
D.  50000 to 80000 Hz

Ans. B

Q35. Which of the following equipment is used for arc welding generally used for arc welding ?

A.  Single phase alternator
B.  Two phase alternator
C.  Three phase alternator
D.  Transformer

Ans. D

ONLINE MCQ EE-ELECTRIC WELDING 4

Q36. In spot welding composition and thickness of the base metal decides

A.  the amount of squeeze pressure
B.  hold time
C.  the amount of weld current
D.  all above

Ans. D

Q37. Motor-generator set for D.C. arc welding has generator of

A.  series type
B.  shunt type
C.  differentially compound type
D.  level compound type

Ans. D

Q38. In atomic hydrogen welding the electrode is made of

A.  carbon
B.  graphite
C.  tungsten
D.  mild steel

Ans. C

Q39. During carbon arc welding

A.  electrode is connected to neutral if A.C. is used
B.  electrode is not connected to any voltage source when A.C. is used
C.  electrode is negative with respect to the work if D.C. is used
D.  electrode is positive with respect to the work if D.C. is used

Ans. C

ONLINE MCQ EE-ELECTRIC WELDING 4

Q40. Flux used in TIG welding is

A.  borax
B.  ammonium chloride
C.  ash
D.  none

Ans. D