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- Question
The machinability of aluminium increases when __________ is added to aluminium.
Options- A. copper
- B. magnesium
- C. silicon
- D. lead and bismuth
- Correct Answer
- lead and bismuth
- 1. Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.
Options- A. Correct
- B. Incorrect Discuss
- 2. In spheroidising process, the steel is
Options- A. heated below the lower critical temperature and then cooled slowly
- B. heated upto the lower critical temperature and then cooled in still air
- C. heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
- D. none of the above Discuss
- 3. Pearlite is a combination of 87% ferrite and 13% cementite.
Options- A. Yes
- B. No Discuss
- 4. The portion of the blast furnace below its widest cross-section is called
Options- A. hearth
- B. stack
- C. bosh
- D. throat Discuss
- 5. The property of a material which enables it to retain the deformation permanently, is called
Options- A. brittleness
- B. ductility
- C. malleability
- D. plasticity Discuss
- 6. Which of the following statement is wrong?
Options- A. A steel with 0.8% carbon is wholly pearlite
- B. The amount of cementite increases with the increase in percentage of carbon in iron
- C. A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
- D. The cementite is identified as round particles in the structure Discuss
- 7. Which of the following inpurity in cast iron makes it hard and brittle?
Options- A. Silicon
- B. Sulphur
- C. Manganese
- D. Phosphorus Discuss
- 8. German silver contains
Options- A. 1% silver
- B. 2% silver
- C. 5% silver
- D. no silver Discuss
- 9. In high speed steels, manganese is used to tougher the metal and to increase its
Options- A. yield point
- B. critical temperature
- C. melting point
- D. hardness Discuss
- 10. Body centred cubic space lattice is found in
Options- A. zinc, magnesinm, 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
Engineering Materials problems
Search Results
Correct Answer: Correct
Correct Answer: heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Correct Answer: Yes
Correct Answer: bosh
Correct Answer: plasticity
Correct Answer: A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
Correct Answer: Sulphur
Correct Answer: no silver
Correct Answer: critical temperature
Correct Answer: alpha-iron, tungsten, chromium and molybdenum
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