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- Question
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
- Correct Answer
- soft and gives a coarse grained crystalline structure
- 1. The property of a material due to which it breaks with little permanent distortion, is called
Options- A. brittleness
- B. ductility
- C. malleability
- D. plasticity Discuss
- 2. Tungsten when added to steel __________ the critical temperature.
Options- A. does not effect
- B. lowers
- C. raises Discuss
- 3. Closed packed hexagonal space lattice is found in
Options- A. zinc, magnesium, cobalt, cadmium, antimony and bismuth
- B. gamma-iron, aluminium, copper, lead, silver and nickel
- C. alpha-iron, tungsten, chromium and molybdenum
- D. none of the above Discuss
- 4. The quenching of steel from the upper critical point results in a fine grained structure.
Options- A. Agree
- B. Disagree Discuss
- 5. The coke in the charge of blast furnace
Options- A. controls the grade of pig iron
- B. acts as an iron-bearing mineral
- C. supplies heat to reduce ore and melt the iron
- D. forms a slag by combining with impurities Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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 Discuss
Engineering Materials problems
Search Results
Correct Answer: brittleness
Correct Answer: raises
Correct Answer: zinc, magnesium, cobalt, cadmium, antimony and bismuth
Correct Answer: Agree
Correct Answer: supplies heat to reduce ore and melt the iron
Correct Answer: do not become hard with the application of heat and pressure and no chemical change occurs
Correct Answer: Aluminium bronze
Correct Answer: hardening and cold working
Correct Answer: all of the above
Correct Answer: different crystal structures at different temperatures
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