Engineering Materials problems
- 1. 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
Correct Answer: spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
- 2. Age hardening is related to
Options- A. duralumin
- B. brass
- C. copper
- D. silver Discuss
Correct Answer: duralumin
- 3. 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
Correct Answer: the grain size increases very rapidly
- 4. Cast iron is used in those parts which are subjected to shocks.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Incorrect
- 5. Delta-iron occurs between the temperature range of
Options- A. 400°C to 600°C
- B. 600°C to 900°C
- C. 900°C to 1400°C
- D. 1400°C to 1530°C Discuss
Correct Answer: 1400°C to 1530°C
- 6. A steel containing 16 to 18% chromium and about 0.12% carbon is called
Options- A. ferritic stainless steel
- B. austenitic stainless steel
- C. martensitic stainless steel
- D. nickel steel Discuss
Correct Answer: ferritic stainless steel
- 7. Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
Options- A. Babbit metal
- B. Monel metal
- C. Nichrome
- D. Phosphor bronze Discuss
Correct Answer: Nichrome
- 8. A coarse grained steel
Options- A. is less tough and has a greater tendency to distort during heat treatment
- B. is more ductile and has a less tendency to distort during heat treatment
- C. is less tough and has a less tendency to distort during heat treatment
- D. is more ductile and has a greater tendency to distort during heat treatment Discuss
Correct Answer: is less tough and has a greater tendency to distort during heat treatment
- 9. In a unit cell of close packed hexagonal space lattice, there are twenty four atoms.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Incorrect
- 10. The main alloying elements high speed steel in order of increasing proportion are
Options- A. vanadium, chromium, tungsten
- B. tungsten, titanium, vanadium
- C. chromium, titanium, vanadium
- D. tungsten, chromium, titanium Discuss
Correct Answer: vanadium, chromium, tungsten
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