Bissoy.com
Doctors Medicines MCQs Q&A

Consider the following statements regarding defects in forgings 1. Flakes are internal breaks or ruptures occurring in some grades of alloy steel. 2. Die shift is caused by misalignment between the top and bottom forging dies. 3. Fins and rags are small projections or loose metal driven into the surface of the forging. Which of the above statements are correct ? 

Consider the following statements regarding defects in forgings 1. Flakes are internal breaks or ruptures occurring in some grades of alloy steel. 2. Die shift is caused by misalignment between the top and bottom forging dies. 3. Fins and rags are small projections or loose metal driven into the surface of the forging. Which of the above statements are correct ?  Correct Answer 1, 2 and 3

Explanation:

Defects in forging:

  • A mismatch occurs in drop forging when the dies are incorrectly aligned, and results in a lateral displacement between portions of the forging.
  • Scale pits are shallow depressions caused by hot removing scale from the dies. The scale is subsequently worked into the surface of the forging.
  • An unfilled section is similar to misrun in casting and occurs when metal does not completely fill the die cavity. It is usually caused by using insufficient metal or insufficient heating of metal.
  • Defects resulting from improper heating and cooling of the forging such as burnt metal, decarburized steel, and flakes.
  • These defects are found in all metals which are heated to the plastic stage and then shaped.
  • Defects resulting from the melting practice, such as dirt, slag and blowholes.
  • Defects resulting from improper forging such as seams, cracks, laps etc.
  • Ingot defects such as pipes, cracks, scabs and segregation.
  • Fins and rags are small projections or loose metal driven into the surface of the forging happens due to poor die-design.

 

Related Questions

Consider the following statements about forging: 1. Forgings have high strength and ductility. 2. Forgings offer great resistance to impact and fatigue loads. 3. Forging assures uniformity in density as well as dimensions of the forged parts. Which of the above statements are correct?
In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: All napkins are towels Statement II: All rags are napkins Conclusion I: Some towels are rags Conclusion II: All rags are towels
In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to beat variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.
Statement I: All napkins are towels
Statement II: All rags are napkins
Conclusion I: Some towels are rags
Conclusion II: All rags are towels
The recrystallization behaviour of a particular metal alloy is specified in terms of recrystallization temperature, which is typically 1/3rd of the absolute melting temperature of a metal or an alloy and depends on several factors including the amount of 1. cold working and purity of the metal and alloy 2. hot working and purity of the metal and alloy Which of the above is/are correct?
The accompanying image shows a large cube made of dark and white small sugar cubes. Small cubes of the diagonally arranged row of the bottom surface of the large cube, small cubes of the row with one face on the right-hand surface of the large cube, small cubes of the row with one face on the front surface of the large cube, and small cubes of the column with one face on the top of large cube surface are all dark. Select the number of small white cubes of the large cube.
In one alloy, there is 50% steel in its total mass, while it is 75% in another alloy. 15 kg of the first alloy was melted together with 10 kg of the second one to form a third alloy. Find the percentage of steel in the new alloy when it is known that 20% of the total steel is getting diminished during the melting process?
In the following question below some statements are given followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusions logically follows the given statements. Statements: Each bottom is top. All top are high. No high is low. Conclusions: I. No bottom is low. II. Some high are bottom. III. Some top are low. 
Some small cubes of same height 7 cm but variable length and width are put inside a large cuboid of height 21 cm. Length and width of cuboid is 32 cm and 24 cm, respectively. Small cubes are put such that cubes at the bottom most layer is of similar base area; second layer contains all the cubes of similar base area and third layer have all the cubes of similar base area. Which of the following statement(s) given below is / are TRUE? A: If side of each small cubes at bottom most layer is 8 cm, then maximum number of small cubes that can be put at bottom most layer is 12. B: If maximum of 48 cubes can be put at second layer, then side of each cube at second layer is 6 cm. C: If side of each small cubes at third layer is 1.6 cm, then maximum number of small cubes that can be put at third layer is 300.
Directions: Seven different boxes A, B, C, D, E, F and G of different colours viz., Orange, Pink, Purple, Yellow, Blue, Red and Green are arranged one above the other. The box at the bottom of arrangement is numbered 1, the above box is numbered 2 and so on. B is immediately above E. More than two boxes are above the Orange box. The Yellow box is immediately below A. Only one box is between the Orange box and F. G is immediately above the Red box. Only one box is between B and the Pink box. Only two boxes are between the Pink and the Green box. Only two boxes are between the Yellow box and the Orange box. The Purple box is neither at the top nor at the bottom of the arrangement.B is above Pink box. C is immediately above F. Neither C nor G is a Yellow box. G is not a Orange box. Question: Which combination represents the position of C and its colour?
An alloy A contains two elements, copper and tin in the ratio of 2 : 3, whereas an alloy B contains the same elements in the ratio of 3 : 4. If 20 kg of alloy A, 28 kg of alloy B and some more pure copper are mixed to form a third alloy C which now contains copper and tin in the ratio of 6 : 7, then what is the quantity of the pure copper mixed in the alloy C?