Discussion
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- Question
The addition of which of the following improves machining of copper?
Options- A. Sulphur
- B. Vanadium
- C. Tin
- D. Zinc
- Correct Answer
- Sulphur
- 1. The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
Options- A. duralumin
- B. Y-alloy
- C. magnalium
- D. hindalium Discuss
- 2. Which of the following metal shrinks most from molten state to solid state?
Options- A. Cast iron
- B. Cast steel
- C. Brass
- D. Admirality metal Discuss
- 3. Free cutting steels
Options- A. contain carbon in free from
- B. require minimum cutting force
- C. is used where rapid machining is the prime requirement
- D. can be cut freely Discuss
- 4. The material in which the atoms are arranged chaotically, is called
Options- A. amorphous material
- B. mesomorphous material
- C. crystalline material
- D. none of these Discuss
- 5. The defect which takes place due to imperfect packing of atoms during crystallisation is known as
Options- A. line defect
- B. surface defect
- C. point defect
- D. none of these Discuss
- 6. When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
Options- A. equal to
- B. less than
- C. more than Discuss
- 7. The alloy, mainly used for corrosion resistance in stainless steels is
Options- A. silicon
- B. manganese
- C. carbon
- D. chromium Discuss
- 8. According to Indian standard specifications, SG 400/15 means
Options- A. spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
- B. spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
- C. spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
- D. none of the above Discuss
- 9. Age hardening is related to
Options- A. duralumin
- B. brass
- C. copper
- D. silver Discuss
- 10. When a medium carbon steel is heated to coarsening temperature,
Options- A. there is no change in grain size
- B. the average grain size is a minimum
- C. the grain size increases very rapidly
- D. the grain size first increases and then decreases very rapidly Discuss
Engineering Materials problems
Search Results
Correct Answer: magnalium
Correct Answer: Admirality metal
Correct Answer: is used where rapid machining is the prime requirement
Correct Answer: amorphous material
Correct Answer: point defect
Correct Answer: less than
Correct Answer: chromium
Correct Answer: spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
Correct Answer: duralumin
Correct Answer: the grain size increases very rapidly
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