In order to prevent oxidation and retain molten metal in stud welding which of the following is used?

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

Projection welding & stud welding is categorised as the __________ welding.

A

Pressure

B

Thermit

C

Resistance

D

Arc

Projection welding & stud welding is categorised as the __________ welding.

A

Pressure

B

Thermit

C

Resistance

D

Arc

Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.

A

I only

B

II only

C

I and III only

D

I, II, and III

In stud partitions, a stud of short length is known as ______

A

Sill

B

Head

C

Puncheon

D

Nogging

Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding

A

i and iv

B

ii and iii

C

ii and iv

D

i and iii

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 in respect of the oxidizing flame due to excess oxygen in welding: 1) AT high temperature, it combines with many metals to form hard and brittle oxides. 2) It causes the weld bead and the surrounding area to have a scummy appearance 3) It has good welding effect in welding of copper-base metal. Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

If the total efficiency is 0.35 in arc welding. Then what is the welding speed in mm/sec if the cross-sectional area is 5mm2, welding power is 2 kW and the heat required in melting the metal is 100 J/mm3.

A

1.4

B

14

C

1400

D

140

Match the following (a) a non-metal that exists in two forms (i) Chlorine (b) a non-metal which is liquid at room temperature (ii) Zinc (c) a metal which is constituent of brass and bronze (iii) Carbon (d) a non-metal used for disinfecting water (iv) Bromine (e) a metal used in electroplating (v) Copper

A

(a) - (iii), (b) - (i), (c) - (ii), (d) - (iv), (e) - (v)

B

(a) - (iv), (b) - (iii), (c) - (v), (d) - (i), (e) - (ii)

C

(a) - (i), (b) - (iv, (c) - (ii), (d) - (iii), (e) - (v)

D

(a) - (iii), (b) - (iv), (c) - (v), (d) - (i), (e) - (ii)

In order to prevent oxidation and retain molten metal in stud welding which of the following is used?

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