Engineering Materials problems
- 1. 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
Correct Answer: heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
- 2. Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 3. The machinability of aluminium increases when __________ is added to aluminium.
Options- A. copper
- B. magnesium
- C. silicon
- D. lead and bismuth Discuss
Correct Answer: lead and bismuth
- 4. 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
Correct Answer: A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
- 5. Which of the following inpurity in cast iron makes it hard and brittle?
Options- A. Silicon
- B. Sulphur
- C. Manganese
- D. Phosphorus Discuss
Correct Answer: Sulphur
- 6. German silver contains
Options- A. 1% silver
- B. 2% silver
- C. 5% silver
- D. no silver Discuss
Correct Answer: no silver
- 7. 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
Correct Answer: critical temperature
- 8. 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
Correct Answer: alpha-iron, tungsten, chromium and molybdenum
- 9. Manganese is added in low carbon steel to
Options- A. make the steel tougher and harder
- B. raise the yield point
- C. make the steel ductile and of good bending qualities
- D. all of the above Discuss
Correct Answer: make the steel ductile and of good bending qualities
- 10. Which of the following property is desirable for materials used in tools and machines?
Options- A. Elasticity
- B. Plasticity
- C. Ductility
- D. Malleability Discuss
Correct Answer: Elasticity
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