Manufacturing Technology (3151912) MCQs

MCQs of Metal Joining Processes

Showing 61 to 70 out of 137 Questions
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61.

Which of the following materials is best weldable with itself

(a)

Stainless steel
(b)

Copper
(c)

Aluminium
(d)

Mild steel
Answer:

Option (d)

62.

Arc welding uses following electric supply

(a)

A.C.
(b)

D.C.
(c)

Both AC and DC
(d)

Spiral waveform
Answer:

Option (c)

63.

Weaving in arc welding refers to

(a)

Side to side motion of electrode at right angles to the direction of the welding
(b)

Side to side motion of electrode along the direction of the welding
(c)

Spiral motion given to electrode
(d)

A technique of striking the arc
Answer:

Option (b)

64.

Fluxes are used in welding in order to protect the molten metal and the surfaces to be jointed from

(a)

Oxidation
(b)

Carburising
(c)

Dirt
(d)

Distortion and warping
Answer:

Option (a)

65.

In arc welding operations the current value is decided by

(a)

Thickness of plate
(b)

Size of the electrode.
(c)

Voltage across the arc
(d)

Speed of travel
Answer:

Option (b)

66.

For arc welding

(a)

alternating current with high frequency is used
(b)

alternating current with low frequency is used
(c)

direct current is used
(d)

any one of these
Answer:

Option (c)

67.

Arc stability is better with

(a)

AC welding
(b)

DC welding
(c)

Both AC and DC welding
(d)

Specially designed wave forms
Answer:

Option (a)

68.

Arc blow occurs in

(a)

Gas welding
(b)

Gas cutting
(c)

Arc welding when straight polarity is used
(d)

Arc welding when reverse polarity is used
Answer:

Option (c)

69.

In coated electrode in arc welding

(a)

Both rod and coating melt simultaneously
(b)

Coating melts first and then rod melts
(c)

Which melts first depends on polarity used
(d)

Rod melts first and then coating melts
Answer:

Option (d)

70.

In arc welding, arc is created between the electrode and work by

(a)

Flow of current
(b)

Voltage
(c)

Material characteristics
(d)

Contact resistance
Answer:

Option (d)

Showing 61 to 70 out of 137 Questions
4 5 6 7 8 9