Engineering Materials problems
- 1. Normalising of steel is done to
Options- A. refine the grain structure
- B. remove strains caused by cold working
- C. remove dislocations caused in the internal structuure due to hot working
- D. all of the above Discuss
Correct Answer: all of the above
- 2. Duralumin has better strength than Y-alloy at high temperature.
Options- A. True
- B. False Discuss
Correct Answer: False
- 3. Duralumin contains
Options- A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
- B. 3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
- C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
- D. 5 to 6% tin, 2 to 3% copper and rest aluminium Discuss
Correct Answer: 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
- 4. The steel scrap added in the charge of cupola controls the grade of cast iron produced.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 5. A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. White cast iron has
Options- A. carbon in the form of carbide
- B. low tensile strength
- C. high compressive strength
- D. all of these Discuss
Correct Answer: all of these
- 7. Polyvinylchloride (PVC) is a __________ material.
Options- A. thermoplastic
- B. thermosetting Discuss
Correct Answer: thermoplastic
- 8. Tin base white metals are used where the bearings are subjected to
Options- A. large surface wear
- B. elevated temperatures
- C. light load and pressure
- D. high pressure and load Discuss
Correct Answer: large surface wear
- 9. Chromium when added to steel __________ the tensile strength.
Options- A. does not effect
- B. decreases
- C. increases Discuss
Correct Answer: increases
- 10. The steel produced by cementation process is known as __________ steel.
Options- A. blister
- B. crucible Discuss
Correct Answer: blister
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