Engineering Materials problems
- 1. Thermosetting plastics are those materials which
Options- A. are formed into shape under heat and pressure and results in a permanently hard product
- B. do not become hard with the application of heat and pressure and no chemical change occurs
- C. are flexible and can withstand considerable wear under suitable conditions
- D. are used as a friction lining for clutches and brakes Discuss
Correct Answer: are formed into shape under heat and pressure and results in a permanently hard product
- 2. The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is
Options- A. normalising
- B. full annealing
- C. process annealing
- D. spheroidising Discuss
Correct Answer: process annealing
- 3. The malleability is the property of a material due to which it can be rolled or hammered into thin sheets.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 4. The process which improves the machinability of steels, but lowers the hardness and tensile strength, is
Options- A. normalising
- B. full annealing
- C. process annealing
- D. spheroidising Discuss
Correct Answer: spheroidising
- 5. Silicon in cast iron
Options- A. makes the iron soft and easily machinable
- B. increases hardness and brittleness
- C. makes the iron white and hard
- D. aids fusibility and fluidity Discuss
Correct Answer: makes the iron soft and easily machinable
- 6. The delta-iron possesses a body centred cubic space lattice.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 7. Which of the following solids are malleable and ductile?
Options- A. Ionic solids
- B. Covalent solids
- C. Metallic solids
- D. none of these Discuss
Correct Answer: Metallic solids
- 8. A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
Options- A. 100 N/mm2
- B. 200 N/mm2
- C. 350 N/mm2
- D. 1000 N/mm2 Discuss
Correct Answer: 350 N/mm2
- 9. The nuts and bolts are made from silicon steel.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Incorrect
- 10. The essential constituent of a hardened steel is
Options- A. pearlite
- B. austenite
- C. martensite
- D. troostite Discuss
Correct Answer: martensite
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