Manufacturing Technology (3151912) MCQs

MCQs of Metal Joining Processes

Showing 71 to 80 out of 137 Questions
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71.

In arc welding, if arc is too short, it will result in

(a)

Formation of large globules in an irregular pattern because Of wandering of arc, leading to poor fusion with base metal
(b)

Electrode sticking to the base metal and base metal not melting and bead resting on top of the work, leading to poor fusion and gas and slag holes
(c)

Arc extinction
(d)

Operator hazard
Answer:

Option (b)

72.

Too low welding current in arc welding would result in

(a)

Excessive piling up of weld metal,poor penetration, wasted electrodes
(b)

Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes
(c)

Too small bead, weak weld and wasted electrodes
(d)

Excessive piling up of weld metal,edges, wasted electrodes, overlapping without penetration of
Answer:

Option (a)

73.

Too high welding current in arc welding would result in

(a)

Excessive piling up of weld metal, poor penetration, wasted electrodes
(b)

Excessive spatter, under tatting along edges, irregular deposits, wasted electrodes
(c)

Too small bead, weak weld and wasted electrodes
(d)

Excessive piling up of weld metal, overlapping without penetration of edges, wasted electrodes
Answer:

Option (b)

74.

The arc length in electric arc welding is the distance between the tip of the electrode and the

(a)

Work piece
(b)

Centre of crater
(c)

Bottom of crater
(d)

Workpiece top surface minus electrode diameter
Answer:

Option (b)

75.

Arc length in arc welding should be equal to

(a)

Diameter of electrode rod (d)
(b)

1.5d
(c)

2d
(d)

3d
Answer:

Option (a)

76.

Open circuit voltage for arc welding is of the order of

(a)

18-40 volts
(b)

40-95 volts
(c)

100-125 volts
(d)

130-170 volts
Answer:

Option (b)

77.

In metallic arc welding, the transfer of metal from the electrode is due to

(a)

Molecular attraction
(b)

Surface tension and attraction
(c)

Gravitational force
(d)

Both (A) and (B) above
Answer:

Option (d)

78.

In arc welding, the temperature of heat produced by the electric arc is of the order of

(a)

3000° C to 4000° C
(b)

4000° C to 5000° C
(c)

5000° C to 6000° C
(d)

6000° C to 7000° C
Answer:

Option (d)

79.

In arc welding, eyes need to be protected against

(a)

Intense glare
(b)

Sparks
(c)

Electroslag
(d)

Infra-red and ultraviolet rays
Answer:

Option (d)

80.

Carbon arc welding is

(a)

A process which uses a mixture of iron oxide and granular aluminium
(b)

A process in which arc is maintained under a blanket of flux
(c)

Used to weld carbon rods
(d)

None of the above
Answer:

Option (d)

Showing 71 to 80 out of 137 Questions
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