Manufacturing Engineering mcq.

1. Which of the following have a non-crystalline structure?

a) Iron
b) Quartz
c) Silica glass
d) Tungsten

Answer: c

Explanation: Silica glass and quartz both are the form of silica non-metal, out of which only quartz have the crystalline structure. Generally, Metals have a crystalline structure.

2. Which of the following have a non-crystalline structure?

a) Steel
b) Nickel
c) High density polythene
d) Low density polythene

Answer: d

Explanation: Remember High density polythene or HDP is a non-metal but has a crystalline structure, whereas steel and nickel are metal and have crystalline structure.

3. Which of the following is a characteristic of crystalline structure?

a) High density
b) Low density
c) Range of melting point
d) Varying structure

Answer: a

Explanation: Crystalline structures are closely packed and hence have the high density.

4. Which of the following is characteristic of non-crystalline structures?

a) Long range of periodicity
b) Well defined structure and geometry
c) Low density
d) Sharp diffraction pattern

Answer: c

Explanation: Non-crystalline structures are loosely packed. They have low density. Non-crystalline structures are formed by a weak secondary bond.

5. Which of the following factor is not responsible for the formation of a non-crystalline structure?

a) Atomic packing has open structure
b) Primary bonds are absent
c) Formation of 1-dimensional chain molecule
d) Strong secondary bond

Answer: d

Explanation: Non-crystalline structures are formed by a weak secondary bond. Non-crystalline structures are loosely packed.

06. Which one of the following is most symmetrical?

a) Simple cubic cell
b) Hexagonal
c) Triclinic
d) Tetragonal

Answer: a

Explanation: The Simple cubic have all angles and sides equal, hence that is most symmetric.

07. Which one of the following is least symmetrical?

a) Tetragonal
b) Simple cubic
c) Triclinic
d) Monoclinic

Answer: c

Explanation: Triclinic have all sides unequal and all angles is unequal.

08. Powder crystal method is used to determine crystal structures

a) True
b) False

Answer: a

Explanation: This is an experimental technique, used to determine crystal structure for the high symmetrical crystals.

09. Vacancy defects in solids is a sub type of :

a) Point Imperfections
b) Line Imperfections
c) Volume Imperfection
d) Surface Imperfection

Answer: a

Explanation: One or more atomic sites are vacant in vacancy defect. Vacancy defects in solids is a sub type of point imperfections.

10. Edge dislocation Imperfection is a sub type of:

a) Point Imperfections
b) Line Imperfections
c) Volume Imperfection
d) Surface Imperfection

Answer: b

11. Which one of the following is not zero dimensional defects?

a) Vacancy defect
b) Substitution Imperfection
c) Schottky’s defect
d) Screw dislocation

Answer: d

Explanation: Zero dimensional defects are the other name of Point Imperfection. Vacancy defects in solids is a sub type of point imperfections.

12. Twin or Twinning is a category of:

a) Point Imperfections
b) Line Imperfections
c) Volume Imperfection
d) Surface Imperfection

Answer: d

Explanation: In Twinning Arrangement of atoms is such that one side of twin boundary is the mirror replica of other side.

13. As grain size of metal increases, Strength of metal:

a) Decreases
b) Increases
c) Remains constant
d) None of the mentioned

Answer: a

Explanation: Strength of metal is inversely proportional to the size of a grain. Coarse are softer in nature while material having fine grain structure are hard in the nature.

14. As grain size of metal increases, Ductility of metal:

a) Decreases
b) Increases
c) remains constant
d) None of the mentioned

Answer: b

Explanation: The Ductility of metal is directly proportional to the size of a grain. As the grain size of metal increases, Ductility of metal increases.

15. The property of material to resist any elastic deformation is known as :

a) Stiffness
b) Hardness
c) Malleability
d) Strength

Answer: a

Explanation: Stiffness is the property of a material to resist any elastic deformation. Larger the stiffness, larger is the ability to resist deformation.

16. Resistance developed by surface of any material is known as :

a) Strength
b) Hardness
c) Stiffness
d) Creep

Answer: b

Explanation: Hardness is a surface property. Resistance developed by surface of any material is known as hardness.

17. Permanent deformation of material with respect to time due to constant load and variable temperature is known as:

a) Elasticity
b) Isotropy
c) Hardness
d) Creep

Answer: d

Explanation: Creep is time and temperature dependent phenomenon. With the passage of time and other environmental condition, material may lead to fracture point.

18. Steel ball is used as indentor in which of the following test?

a) Brinell hardness test
b) Rockwell harness test
c) Vickers hardness test
d) All of the mentioned

Answer: a

Explanation: Steel ball is used as indentor in Brinell hardness test. It is used to test the hardness of substance.

19. In which of the following test specimen is in the form of the simply supported beam?

a) Izod test
b) Rockwell harness test
c) Charpy test
d) All of the mentioned

Answer: c

Explanation: Test specimen is in the form of simply supported beam in Charpy impact test. It is used to test the hardness of substance.

20.In which of the following test specimen is in the form of cantilever beam?

a) Izod test
b) Rockwell harness test
c) Charpy test
d) All of the mentioned

Answer: a

Explanation: Test specimen is in the form of cantilever beam in Charpy impact test.

21.Number of scales used Rockwell hardness test is :

a) 12
b) 14
c) 13
d) 17

Answer: c

Explanation: Total 13 scales named A, B, C, D etc are used in Rockwell hardness test.

22. Mohs hardness test has a scale range of

a) 0 to 10
b) 100 to 200
c) 0 to 1000
d) 0 to 3000

Answer: a

Explanation: Mohs hardness test has a scale range of 0 to 10.

23. Brinell’s hardness test has a scale range of

a) 0 to 10
b) 100 to 200
c) 0 to 1000
d) 0 to 3000

Answer: d

Explanation: Brinell’s hardness test has a scale range of 0 to 3000. Brinell hardness number of soft iron is ranges from 67 to500.

24. Rockwell’s hardness test has a scale range of

a) 0 to 10
b) 100 to 200
c) 0 to 1000
d) 0 to 3000

Answer: c

Explanation: Rockwell’s hardness test has a scale range of 0 to 1000. It is used to measure the hardness of a specimen.

25. Vicker’s hardness test has a scale range of

a) 0 to 10
b) 100 to 200
c) 0 to 1000
d) 0 to 3000

Answer: d

Explanation: Vicker’s hardness test has a scale range of 0 to 3000. It is used to measure the hardness of a specimen.

26. Brinell Hardness Number for soft iron is between

a) 1000-2000
b) 227-857
c) 67-500
d) 0-10

Answer: c

Explanation: Brinell hardness number of soft iron ranges from 67 to 500. It is used to measure the hardness of a specimen.

27. Which of the following compound is used for fine polishing?

a) Aluminum oxide
b) Nitric oxide
c) Silicon carbide
d) Iron oxide

Answer: a

Explanation: Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.

28. Etching of specimen is done to achieve

a) Visible grain boundary
b) Invisible grain boundary
c) Toughness
d) Hardness

Answer: a

Explanation: Etching is done to obtain visible grain boundary. It is a surface treatment process.

29. Equipment used for inspection of inside portion of hollow chamber or narrow tube is known as

a) Endoscope
b) Telescope
c) Borescope
d) Flexiscope

Answer: c

Explanation: Borescope is used for visual of inside portion of the hollow chamber.

30. Which of the following property will be more in fine grained structure?

a) Ductility
b) Corrosion resistance
c) Creep resistance
d) Hardness

Answer: a

Explanation: Fine grain structure can be easily made into wire and hence have more ductility.

31. Iron carbon phase diagram is

a) Unary phase
b) Binary phase
c) Tertiary phase
d) None of the mentioned

Answer: b

Explanation: Iron carbon diagram is a binary phase diagram. Diagram which contains only two phases are known as binary phase diagram.

32. Which of the following material have carbon percentage between 2.1 to 4.3?

a) Dead steel
b) Mild steel
c) Medium carbon steel
d) Cast iron

Answer: d

Explanation: The percentage of carbon in cast iron lies between 2.1 to 2.3. Cast iron is brittle in nature.

33. Which of the following material have carbon percentage in the range from 4.3 to 6.67?

a) Pig iron
b) Mild steel
c) Medium carbon steel
d) Cast iron

Answer: a

Explanation: The percentage of carbon in Pig iron lies from 4.3 to 6.67. This form has less application in industries and usually converted to other forms for use.

34. Which of the following is soft in nature?

a) Coarse perliite
b) Fine perlite
c) Bainite
d) Martensite

Answer: a

Explanation: Coarse structure of coarse perlite makes them softer. Coarse structure has bigger grain size and are not arranged properly.

35.Which of the following is hardest in nature?

a) Coarse perliite
b) Fine perlite
c) Bainite
d) Martensite

Answer: d

Explanation: Fine structure of coarse martensite makes them hardest. Fine grains are very small in size and are orderly arranged.

36. Degree of freedom at a triple point is equal to :

a) 1
b) 10
c) 0
d) -1

Answer: c

Explanation: At triple point degree of freedom becomes zero. There is no possible movement in any plane at the triple point of any substance.

37. Wrought iron can be easily obtained by processing iron ore in:

a) Cupola
b) Bessemer converter
c) Pudding furnace
d) Blast furnace

Answer: c

Explanation: Iron from its pig iron form is converted to wrought iron in pudding furnace. As pig iron is very weak in strength hence it can not be used for practical purpose.

38. Steel can be easily obtained in:

a) Cupola
b) Blast furnace
c) Pudding furnace
d) Bessemer converter

Answer: d

Explanation: Iron from its pig iron form is converted to steel in Bessemer converter.As pig iron is very weak in strength hence it can not be used for practical purpose.

39. Abrasion resistance of an alloy steel can be improved using

a) Tungsten
b) Vanadium
c) Manganese
d) Titanium

Answer: d

Explanation: Titanium has very high abrasive resistance property. Titanium is used to improve abrasive resistance of base metal in an alloy.

40. Wear resistance of an alloy steel can be improved using

a) Tungsten
b) Vanadium
c) Manganese
d) Titanium

Answer: c

Explanation: Manganese has very high wear resistance property. Magnesium is alloyed with base metal to increase its wear resistance property.

41. Corrosion resistance of an alloy steel can be improved using

a) Tungsten
b) Vanadium
c) Chromium
d) Titanium

Answer: c

Explanation: Chromium has very high corrosion and oxidation resistance property. Chromium is alloyed with base metal to increase its corrosion resistance.

42. Tensile strength of an alloy steel can be improved using

a) Nickel
b) Vanadium
c) Manganese
d) Titanium

Answer: a

Explanation: Nickel can improve tensile strength as well as toughness of alloy steel. It is alloyed with base metal in small quantity.

43. Which of the following induces fine grain distribution in alloy steel?

a) Nickel
b) Vanadium
c) Manganese
d) Titanium

Answer: b

Explanation: Vanadium induces fine grain distribution in alloy steel. It helps in improving uniformity in the base metal.