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Test: Fabrication Processes (Welding) - 2


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30 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Fabrication Processes (Welding) - 2

Test: Fabrication Processes (Welding) - 2 for Mechanical Engineering 2023 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Test: Fabrication Processes (Welding) - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Fabrication Processes (Welding) - 2 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Fabrication Processes (Welding) - 2 below.
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Test: Fabrication Processes (Welding) - 2 - Question 1

 Fabrication weldability test is used to determine     

Test: Fabrication Processes (Welding) - 2 - Question 2

Match List I (Welding problems) with List II (Causes) and select the correct answer using the codes given below the Lists: 

[IES - 2004]

Test: Fabrication Processes (Welding) - 2 - Question 3

 By which one of the following methods gray iron is usually welded? 

Test: Fabrication Processes (Welding) - 2 - Question 4

Preheating before welding is done to         

Test: Fabrication Processes (Welding) - 2 - Question 5

In a gas welding of mild steel using an oxy-acetylene flame, the total amount of acetylene consumed is 10 litre. The oxygen consumption from the cylinder is

Test: Fabrication Processes (Welding) - 2 - Question 6

In arc welding, d.c. reverse polarity is used to hear greater advantage in 

Test: Fabrication Processes (Welding) - 2 - Question 7

In an arc welding process, the voltage and current are 25 V and 300 A respectively. The arc heat transfer efficiency is 0.85 and welding speed is 8 mm/see. The net heat input (in J/mm) is 

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 7

Effective heat transfer per second (P) = η VI =0.85x25x300 J/s

Speed (c) = 8 mm/s

Net heat input 

Test: Fabrication Processes (Welding) - 2 - Question 8

Arc blow is more common in       

Test: Fabrication Processes (Welding) - 2 - Question 9

An arc welded joint is shown in the above figure. The part labelled 'B' in the figure is known as

 

Test: Fabrication Processes (Welding) - 2 - Question 10

In which of the following welding processes, flux is used in the form of granules? 

Test: Fabrication Processes (Welding) - 2 - Question 11

In resistance welding, heat is generated due to the resistance between 

Test: Fabrication Processes (Welding) - 2 - Question 12

Assertion (A): Spot welding is adopted to weld two overlapped metal pieces between two electrode points. Reason (R): In this process when current is switched on, the lapped pieces of metal are heated in a restricted area.  

Test: Fabrication Processes (Welding) - 2 - Question 13

Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 micro-ohms and current flow time of 0.2 second, heat generated during the process will be   

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 13

Q = I2Rt = 50002 × (200 ×10−6 ) × 0.2J = 1000J

Test: Fabrication Processes (Welding) - 2 - Question 14

Assertion (A): In electron beam welding process, vacuum is an essential process parameter

Reason (R): Vacuum provides a highly efficient shield on weld zone  

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 14

Correct Answer :- B

Explanation : EBW is carried out in vacuum to avoid dispersion or deviation from the focus.

Test: Fabrication Processes (Welding) - 2 - Question 15

Match List I (Welding processes) with List II (Features) and select the correct answer using the codes given below the Lists: 

Codes:

Test: Fabrication Processes (Welding) - 2 - Question 16

Which one of the following is a solid state joining process?                 

Test: Fabrication Processes (Welding) - 2 - Question 17

The strength of a brazed joint     

Test: Fabrication Processes (Welding) - 2 - Question 18

Consider the following statements: The magnitude of residual stresses in welding depends upon                                  

1. design of weldment  

2. support and clamping of components

3. welding process used  

4. amount of metal melted / deposited

Which of the statements given above are correct?  

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 18

Correct Answer :- b

Explanation : Residual stress depends on welding parameters such as current, voltage, speed, current.

Test: Fabrication Processes (Welding) - 2 - Question 19

The ratio of acetylene to oxygen is approximately………. for a neutral flames used in gas welding.     


Test: Fabrication Processes (Welding) - 2 - Question 20

In Oxyacetylene gas welding, temperature at the inner cone of the flame is around 

Test: Fabrication Processes (Welding) - 2 - Question 21

In oxy-acetylene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is        

Test: Fabrication Processes (Welding) - 2 - Question 22

Oxyacetylene reducing flame is used while carrying out the welding on 

Test: Fabrication Processes (Welding) - 2 - Question 23

Assertion (A): The electrodes of ac arc welding are coated with sodium silicate, whereas electrodes used for dc arc welding are coated with potassium silicate binders.

Reason (R): Potassium has a lower ionization potential than sodium.  

Test: Fabrication Processes (Welding) - 2 - Question 24

In d.c. welding, the straight polarity (electrode negative) results in    

*Multiple options can be correct
Test: Fabrication Processes (Welding) - 2 - Question 25

Which one of the following statements is correct?        

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 25

Correct Answer :- a,b

Explanation : Although the classic flux for steel was borax, and the filler rod is dipped in a can of borax, while the rod is still very hot. The shielding gas is supplied by the torch itself as the work is done inside the area covered by the flame.

So the flux took care of minor oxide contamination, and the torch flame kept the weld puddle from seeing atmospheric oxygen.

Generally DCSP is used in GTAW with the exception of AC being used in aluminium and Magnesium.

Test: Fabrication Processes (Welding) - 2 - Question 26

In MIG welding, the metal is transferred into the form of which one of the following?   

Test: Fabrication Processes (Welding) - 2 - Question 27

For butt -welding 40 mm thick steel plates, when the expected quantity of such jobs is 5000 per month over a period of 10 year, choose the best suitable welding process out of the following available alternatives. 

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 27

We need maximum metal deposition rate so choice SAW.
Note: You know maximum metal deposition rate of all welding is SAW and it may joint 40 mm thick plates easily.

Test: Fabrication Processes (Welding) - 2 - Question 28

Resistance spot welding is performed on two plates of 1.5 mm thickness with 6 mm diameter electrode, using 15000 A current for a time duration of 0.25 seconds. Assuming the interface resistance to be 0.0001 Ω , the heat generated to form the weld is       

Detailed Solution for Test: Fabrication Processes (Welding) - 2 - Question 28

H = I2Rt = 150002 × 0.0001× 0.25J = 5625 W − s

Test: Fabrication Processes (Welding) - 2 - Question 29

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

Test: Fabrication Processes (Welding) - 2 - Question 30

In which one of the following welding techniques is vacuum environment required? 

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