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- Question
A material is said to be allotropic, if it has
Options- A. fixed structure at all temperatures
- B. atoms distributed in random pattern
- C. different crystal structures at different temperatures
- D. any one of the above
- Correct Answer
- different crystal structures at different temperatures
- 1. The unit cells
Options- A. contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
- B. have the same orientation and their similar faces are parallel
- C. may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
- D. all of the above Discuss
- 2. The hardness and tensile strength in austenitic stainless steel can be increased by
Options- A. hardening and cold working
- B. normalising
- C. martempering
- D. full annealing Discuss
- 3. Which of the following has a fine gold colour and is used for imitation jewellery?
Options- A. Silicon bronze
- B. Aluminium bronze
- C. Gun metal
- D. Babbit metal Discuss
- 4. Thermoplastic materials 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
- 5. Free carbon in iron makes the metal
Options- A. soft and gives a coarse grained crystalline structure
- B. soft and gives a fine grained crystalline structure
- C. hard and gives a coarse grained crystalline structure
- D. hard and gives a fine grained crystalline structure Discuss
- 6. The hardness is the property of a material due to which it
Options- A. can be drawn into wires
- B. breaks with little permanent distortion
- C. can cut another metal
- D. can be rolled or hammered into thin sheets Discuss
- 7. Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?
Options- A. Bessemer process
- B. Open hearth process
- C. Duplex process
- D. Electric process Discuss
- 8. The charge is fed into the blast furnace through the
Options- A. stack
- B. throat
- C. bosh
- D. tuyers Discuss
- 9. The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.
Options- A. superior
- B. inferior Discuss
- 10. Nodular cast iron is produced by adding __________ to the molten cast iron.
Options- A. nickel
- B. chromium
- C. copper
- D. magnesium Discuss
Engineering Materials problems
Search Results
Correct Answer: all of the above
Correct Answer: hardening and cold working
Correct Answer: Aluminium bronze
Correct Answer: do not become hard with the application of heat and pressure and no chemical change occurs
Correct Answer: soft and gives a coarse grained crystalline structure
Correct Answer: can cut another metal
Correct Answer: Duplex process
Correct Answer: throat
Correct Answer: inferior
Correct Answer: magnesium
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