Discussion
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- Question
Polyvinylchloride (PVC) is a __________ material.
Options- A. thermoplastic
- B. thermosetting
- Correct Answer
- thermoplastic
- 1. 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
- 2. 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
- 3. The steel scrap added in the charge of cupola controls the grade of cast iron produced.
Options- A. Correct
- B. Incorrect Discuss
- 4. 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
- 5. Duralumin has better strength than Y-alloy at high temperature.
Options- A. True
- B. False Discuss
- 6. 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
- 7. Chromium when added to steel __________ the tensile strength.
Options- A. does not effect
- B. decreases
- C. increases Discuss
- 8. The steel produced by cementation process is known as __________ steel.
Options- A. blister
- B. crucible Discuss
- 9. The acidic bessemer process is suitable for producing steel from pig iron containing large quantities of phosphorus.
Options- A. Correct
- B. Incorrect Discuss
- 10. In process annealing, the hypo-eutectoid steel is
Options- A. heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
- B. heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
- C. heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
- D. heated below or close to the lower critical temperature and then cooled slowly Discuss
Engineering Materials problems
Search Results
Correct Answer: all of these
Correct Answer: True
Correct Answer: Correct
Correct Answer: 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
Correct Answer: False
Correct Answer: large surface wear
Correct Answer: increases
Correct Answer: blister
Correct Answer: Incorrect
Correct Answer: heated below or close to the lower critical temperature and then cooled slowly
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