In the consumable electrode shielded metal arc welding process, which of the following observations are correct?<br>P. The, weld composition does not depend upon the basicity of the slag.<br>Q. Basic flux is used to achieve low hydrogen content-and low inclusion content in the weld metal.<br>R. Reverse polarity of the direct current power source is used to weld thin sheets.<br>S. Coated electrodes are classified by tensile strength of the weld metal deposit.

Consider the following statements: In metal arc welding 1. Utilizes a consumable electrode 2. A welding torch used is connected to acetylene gas supply 3. The electrode and work-piece are connected to the welding power supply. Which of these statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Consider the following statements: MIG welding process uses: 1. Consumable electrode 2. Non-consumable electrode 3. D.C. power supply 4. A.C. power supply Which of the following option is correct?

A

2 and 4 are correct

B

2 and 3 are correct

C

1 and 4 are correct

D

1 and 3 are correct

Why is electrode coated with a flux in shielded metal arc welding?

A

for shiny appearance of electrode

B

to make welding faster

C

to increase the melting of electrode

D

to protect the electrode

Which of the following statement(s) is/are true regarding butt welding? 1. Flash butt welding is a combination of resistance, arc and pressure welding 2. Upset butt welding is used for welding rods 3. Percussion Welding is a self timing spot welding method 4. Aluminium alloys are flash welded

A

1, 2, and 3

B

Only 2 and 3

C

2, 3, and 4

D

Only 1 and 4

What is the effective throat thickness dimension of 10mm fillet weld made by shielded metal arc welding and submerged arc welding?

A

4.6mm, 5mm

B

5mm, 4.6mm

C

8.6mm, 7mm

D

7mm, 8.6mm

What is the differentiating factor between flux core arc welding and gas-shielded metal arc welding processes?

A

structure and chemical composition of electrode

B

structure and chemical composition of metal plate

C

time of welding

D

process of welding

Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion (a): During welding of aluminium alloys by the gas tungsten arc welding process, direct current reverse polarity (DCRP) mode is used.
Reason (r): DCRP facilitate breaking up of the oxide film on the workpiece surface.

A

a is true but r is false

B

a is false but r is true

C

both a and r are true, and r is the reason for a

D

both a and r are true, and r is not the reason for a

The median for an odd number of observations is _________ where n is the number of observations. rank on the ascending order of observations b) rank on the ascending order of observations c) Average of and (n/2) rank on the ascending order of observations d) (n/2) rank on the ascending order of observations

A

rank on the ascending order of observations

B

(n-1)/2 + 1

C

(n-1)/2 + 1

D

(n-1)/2 + 1

In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as

A

Fusion

B

Reverse polarity

C

Forward welding

D

Direct polarity

If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as

A

ARC

B

Short ARC

C

ARC length

D

ARC blow

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