Fabrication Processes (Welding) - MCQ Test 1


20 Questions MCQ Test Mock Test Series - Mechanical Engineering (ME) for GATE 2020 | Fabrication Processes (Welding) - MCQ Test 1


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This mock test of Fabrication Processes (Welding) - MCQ Test 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 20 Multiple Choice Questions for Mechanical Engineering Fabrication Processes (Welding) - MCQ Test 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Fabrication Processes (Welding) - MCQ Test 1 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Fabrication Processes (Welding) - MCQ Test 1 exercise for a better result in the exam. You can find other Fabrication Processes (Welding) - MCQ Test 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

Assertion (A): Aluminium has poor weldability.              

Reason (R): Aluminium has high thermal conductivity and high affinity to oxygen.  

Solution:
QUESTION: 2

Which of the following effects are possible due to residual stresses in welding?    

1.  Reduce dimensional stability.  

2.  Weld cracking.

3.  Effect on fatigue strength   

4.  Reduction in the creep strength.

Select the correct answer using the code given below:  

Solution:
QUESTION: 3

Assertion (A): A sound welded joint should not only be strong enough but should also exhibits a good amount of ductility                    

Reason (R): Welding process is used for fabricating mild steel components only  

Solution:
QUESTION: 4

The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is  

Solution:
QUESTION: 5

Consider the following statements in respect of oxy-acetylene welding:    

1. The joint is not heated to a state of fusion.       

2. No pressure is used.    

3. Oxygen is stored in steel cylinder at a pressure of 14 MPa.    

4. When there is an excess of acetylene used, there is a decided change in the appearance of flame.    

Which of the statements given above are correct?  

Solution:

the joint is heated to a state of fusion.

QUESTION: 6

Assertion (A): If neutral flame is used in oxy-acetylene welding, both oxygen and acetylene cylinders of same capacity will be emptied at the same time.  

Reason (R): Neutral flame uses equal amounts of oxygen and acetylene.  

Solution:

Both A and R are true and R is the correct explanation of A

QUESTION: 7

In manual arc welding, the equipment should have drooping characteristics in order to maintain 

Solution:
QUESTION: 8

Open-circuit voltage of 60 V and current of 160A were the welding conditions for arc welding of a certain class of steel strip of thickness 10 mm. For arc welding of 5mm thick strip of the same steel, the welding voltage and current would be  

Solution:

Speed of the welding remains constant so metal deposition rate will be halved.

QUESTION: 9

The electrodes used in arc welding are coated. This coating is not expected to 

Solution:
QUESTION: 10

Pinch effect in welding is the result of             

Solution:

A pinch welding gives narrow and long flame which is concentrated on desired part, it is achieving by an induction coil, which results in electromagnetic forces.

QUESTION: 11

The coating material of an arc welding electrode contains which of the following?  

1. Deoxidising agent  

2. Arc stabilizing agent  

3. Slag forming agent

Select the correct answer using the code given below:  

Solution:
QUESTION: 12

 Which one of the following welding processes uses non- consumable electrodes?   

Solution:

TlG welding uses non consumable electrodes.

QUESTION: 13

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. 

Solution:

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.

QUESTION: 14

Tool material not suited to resistance welding is          

Solution:
QUESTION: 15

Spot welding of two 1 mm thick sheets of steel (density = 8000 kg/m3) is carried out successfully by passing a certain amount of current for 0.1 second through the electrodes. The resultant weld nugget formed is 5 mm in diameter and 1.5 mm thick. If the latent heat of fusion of steel is 1400 kJ/kg and the effective resistance in the welding operation in 200 Ω , the current passing through the electrodes is approximately    

Solution:

Heat required for melting = (mL) =

QUESTION: 16

Consider the following processes:                                                          

1. Gas welding    

2. Thermit welding  

3. Arc welding    

4. Resistance welding

The correct sequence of these processes in increasing order of their welding temperatures is  

Solution:
QUESTION: 17

Consider the following welding processes:

1. TIG welding    

2. Submerged arc welding

3. Electro-slag welding  

4. Thermit welding              

Which of these welding processes are used for welding thick pieces of metals?  

Solution:

Correct Answer :- d

Explanation : The three main welding techniques that are used in a shipyard are as follows:

Arc Welding

Gas Welding

Resistance Welding

 

Electro-slag welding is used for joining thick materials in the vertical plane. It is not an arc process, depending on the electrical resistivity of molten flux to produce the heat necessary to melt both filler and base metal. As the flux melts, a slag blanket (2.5–3.8 mm thick) is formed.

QUESTION: 18

Electron beam welding can be carried out in                  

Solution:

Electron beam welding is carried out in vacuum.

QUESTION: 19

Which one of the following welding processes consists of minimum heat affected zone (HAZ)?   

Solution:
QUESTION: 20

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

Solution:

In Brazing base metal is not melted. And filler metal is not same or similar to that of base metal.

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