Steels with high carbon equivalent have poor weldability, because in these steels during welding

Steels with high carbon equivalent have poor weldability because in these steels during welding

A

carbon and other alloying elements get oxidised from the weld pool

B

excessive ferrite forms in the heat affected zone leading to the poor toughness of the weld

C

martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

D

segregation of carbon and other elements occurs in the weld pool leading to poor properties of the weld

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

In the following question, two statements are numbered as A and B. On solving these statements we get quantities A and B respectively. Solve for the both quantities and chose the correct option. Quantity A: In the mixture of carbon and metal flux of 1 kg volume, 14% is carbon. How much amount of metal flux needs to add, so that proportion of carbon becomes 4%? Quantity B: The sugar sold by a shopkeeper contained 28% of poor quality sugar. What quantity of good quality of sugar should be added to 250 kg of sugar so that the proportion of poor quality sugar becomes 5%?

A

Quantity A > Quantity B

B

Quantity A < Quantity B

C

Quantity A ≥ Quantity B

D

Quantity A ≤ Quantity B

E

Quantity A = Quantity B

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

Which one of the following carbon equivalent in steel is considered good for weldability?

A

1.0

B

0.8

C

0.6

D

0.4

Friction welding cannot be used for welding stainless steel to carbon steels.

A

True

B

False

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

In this question, a statement is given followed by four conclusions. Choose the conclusion(s) which best fit(s)logically. Statement: Ability is poor man's wealth. Conclusions: I. A poor man can earn wealth if he has ability. II. A wealthy man is always able. III. A poor man is always able. IV. A poor man has the ability to earn wealth.

A

Only conclusion III follows

B

Only conclusion II follows

C

Only conclusion IV follows

D

Only conclusion I follows

Read the given passage and answer the question that question that follow. On paper the Indian Government spends a lot on the poor but in reality the poor barely get anything. The major reason for this misallocation of funds is corruption. As the money has to pass through several stages before reaching the poor, most of it is taken by the corrupt officials and the small amount that reaches the poor, is used inadequately. This is one of the problems that slows down the progress of the country. Which of the following argument could be made from the above passage?

A

Funds meant for the poor are spent on the farmers and that restricts their development.

B

Poor people cannot develop until the money meant for them reaches them.

C

Corrupt officials spend their money on poor.

D

Corruption is an inevitable consequence of democracy.

In the carbonation of a soft drink, the total quantity of carbon dioxide required is the equivalent of 3 volumes of gas to one volume of water at 0⁰C and atmospheric pressure. Calculate (i) the mass fraction and (ii) the mole fraction of the CO2 in the drink, ignoring all components other than CO2 and water. Basis 1 m3 of water = 1000 kg Volume of carbon dioxide added = 3 m3 From the gas equation, pV = nRT 1 x 3 = n x 0.08206 x 273 n = 0.134 mole. Molecular weight of carbon dioxide = 44 And so weight of carbon dioxide added = 0.134 x 44 = 5.9 kg

A

6.9 × 10-3, 3.41 × 10-3

B

8.9 × 10-3, 2.41 × 10-3

C

5.9 × 10-3, 2.41 × 10-3

D

9.9 × 10-3, 3.41 × 10-3

Steels with high carbon equivalent have poor weldability, because in these steels during welding

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