Test: Joining Processes - 3 - Mechanical Engineering MCQ

# Test: Joining Processes - 3 - Mechanical Engineering MCQ

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## 30 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Joining Processes - 3

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Test: Joining Processes - 3 - Question 1

### A shielded metal arc welding operation takes place on a steel workpiece (with a steel electrode) with a 20 V power supply. If a weld with a triangular cross-section with a 10 mm leg length is to be produced, estimate the current needed for a welding speed of 10 mm/s. Use an efficiency of 80% and specific energy as 10.3 J/mm2

Detailed Solution for Test: Joining Processes - 3 - Question 1

Heat input in arc welding

H = u(volume) = uAl
where u is specified energy
∴ welding speed,

Test: Joining Processes - 3 - Question 2

### Match the List-I (Welding processes) with List-II (Description): List-I A. Plasma arc welding B. MIG welding C. TIG welding D. Electroslag welding List-II 1. Arc is produced between a non-consumable electrode and the workpiece. 2. Is very much useful for joining thick materials? 3. Gives high heat concentration resulting in higher welding speeds. 4. Uses consumable electrodes. Codes:      A  B  C  D (a) 4  3  1  2 (b) 3  2  1  4 (c) 3  4  1  2 (d) 2  4  1 3

Test: Joining Processes - 3 - Question 3

### Match the List-I (Filler rod materials) with List-ll (Joining processes): List-I    A. Mild steel     B. Bronze     C. Brass     D. Lead and tin alloy List-ll 1. MIG welding 2. Soldering 3. Brazing 4. Thermit welding 5. Braze welding Codes:       A  B  C   D (a)  1  5   3   2 (b)  4  3   2   5 (c)  4  3   5   2 (d)  1  3   5   4

Test: Joining Processes - 3 - Question 4

Electron beam welding can be carried out in

Test: Joining Processes - 3 - Question 5

Match the List-I (Welding processes) with List-II (Features):
List-I
A. Ultrasonic welding
B. Electron beam welding
C. Plasma arc welding
D. Stud welding
List-II
1. Gas heated to ionized condition for conduction of electric current
2. High frequency and high intensity vibrations
3. Requires vacuum
4. Exothermic chemical reaction
5. Ceramic ferrule Codes:
A B C D
(a) 1 2 4  5
(b) 4 3 1  2
(c) 2 1 4  3
(d) 2 3 1  5

Test: Joining Processes - 3 - Question 6

The major difficulty during welding of aluminium is due to its

Test: Joining Processes - 3 - Question 7

Consider the following statements:
1. The electrode is non consumable.
2. Both DC and AC power supplies can be used.
3. Fluxes are required for thinner sections.
Q. Which of the above statements is/are correct for TIG welding?

Test: Joining Processes - 3 - Question 8

Which one of the following is not a fusion welding process?

Detailed Solution for Test: Joining Processes - 3 - Question 8

Gas welding, arc welding and resistance welding are the fusion welding process while brazing is allied process in which parent metal is not heated up to molten state.

Test: Joining Processes - 3 - Question 9

Which of the following welding techniques uses a non-consumable electrode?​

Detailed Solution for Test: Joining Processes - 3 - Question 9

TIG welding uses tungsten electrode which is non-consumable.

Test: Joining Processes - 3 - Question 10

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

Test: Joining Processes - 3 - Question 11

Preheating of work piece is essential in welding

Detailed Solution for Test: Joining Processes - 3 - Question 11

Preheating is often employed when welding cast iron, high carbon steel or alloy steel since preheating slows down the cooling rate of that area of parent metal close to the weld itself and the weld itself and thereby prevents the formation of martensite which accounts for hardness across the weld. The chance of cracking in the heat- affected zone due to unequal contraction during cooling is also minimized by preheating.

Test: Joining Processes - 3 - Question 12

Consider the following statements:
MIG welding process uses
1. Consumable electrode
2. Nonconsumable electrode
3. D.C. power supply
4. A.C. power supply
Q. Which of these statement are correct?

Detailed Solution for Test: Joining Processes - 3 - Question 12

Metal inert gas arc welding or more appropriately called as gas metal arc welding utilizes a consumable electrode. Normally DC arc welding machines are used for MIG with electrode positive.

Test: Joining Processes - 3 - Question 13

Grey cast iron is usually welded by

Test: Joining Processes - 3 - Question 14

Arc blow is more common in

Test: Joining Processes - 3 - Question 15

The phenomenon of weld decay occurs in

Test: Joining Processes - 3 - Question 16

High speed electron beam of electron beam welding is focused on the weld spot using

Detailed Solution for Test: Joining Processes - 3 - Question 16

Electromagnetic focusing lens are used to creat magnetic field and due to this electron converge into beam.

Test: Joining Processes - 3 - Question 17

Which one of the following welding processes consists of minimum heat affected zone

Detailed Solution for Test: Joining Processes - 3 - Question 17

Minimum heat affected zone is obtained by laser beam walding and then electron beam welding.

Test: Joining Processes - 3 - Question 18

Following gases are used in TIG welding

Detailed Solution for Test: Joining Processes - 3 - Question 18

The shielding gases most commonly used are argon, helium, carbon dioxide and mixture of them.

Test: Joining Processes - 3 - Question 19

In arc welding process the intense heat is developed between the work and the electrode largely due to

Test: Joining Processes - 3 - Question 20

Lap joints are employed on plates having thickness

Test: Joining Processes - 3 - Question 21

Seam welding is a

Detailed Solution for Test: Joining Processes - 3 - Question 21

In seam welding electrodes used in the form ol rollers or wheels, and leak proof joint is obtained bv this.

Test: Joining Processes - 3 - Question 22

Which one of the following is not an electric resistance method of welding

Detailed Solution for Test: Joining Processes - 3 - Question 22

Electroslag welding is a type of arc welding.

Test: Joining Processes - 3 - Question 23

The maximum heat in resistance welding is at the

Detailed Solution for Test: Joining Processes - 3 - Question 23

Since the resistance is maximum at the interference of the two sheets being joined hence maximum heat will generate at the same place.

Test: Joining Processes - 3 - Question 24

Preheating before welding is done to

Test: Joining Processes - 3 - Question 25

In shielded arc welding

Detailed Solution for Test: Joining Processes - 3 - Question 25

Shielded metal arc welding is most extensively used manual welding process which is done with coated electrode. The coating is known as flux.

Test: Joining Processes - 3 - Question 26

In which of the following welding techniques in vacuum environment required

Detailed Solution for Test: Joining Processes - 3 - Question 26

In electron beam welding, vacuum is required in order to conserve the kinetic energy of electron beam before hitting the workpiece.

Test: Joining Processes - 3 - Question 27

Pinch effect in welding is the result of

Detailed Solution for Test: Joining Processes - 3 - Question 27

Since electrode can be considered as large number of parallel conductors and when current flows in the same direction an attractive force will develope this is known as pinch force. Since this is a electromagnetic force hence it is also called electromagnetic pinch force.

Test: Joining Processes - 3 - Question 28

Projection welding is

Test: Joining Processes - 3 - Question 29

The temperature of plasma torch is of the order is

Detailed Solution for Test: Joining Processes - 3 - Question 29

The temperature of plasma torch is around 33000°C.

Test: Joining Processes - 3 - Question 30

Oxyacetylene flame cuts metal by its

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