- A. Are formed into shape under heat and pressure and results in a permanently hard product
- B. Do not become hard with the application of heat and pressure and no chemical change occurs
- C. Are flexible and can withstand considerable wear under suitable conditions
- D. Are used as a friction lining for clutches and brakes
Engineering Materials
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Thermoplastic materials are those materials which_____.
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The composition of silver solder is_____.
- A. Silver, copper, zinc
- B. Silver, tin, nickel
- C. Silver, lead, zinc
- D. Silver, copper, aluminium
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Smelting is the process of_____.
- A. Removing the impurities like clay, sand etc. from the iron ore by washing with water
- B. Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
- C. Reducing the ore with carbon in the presence of a flux
- D. All of the above
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Phosphor bronze contains_____.
- A. 0.5% of phosphorous
- B. 1% phosphorous
- C. 2.5% phosphorous
- D. None of the above
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In process annealing, the hypo eutectoid steel is_____.
- 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 closes to the lower critical temperature and then cooled slowly
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Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_____.
- A. 50 : 50
- B. 30 : 70
- C. 70 : 30
- D. 40 : 60
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The coordination number of a face centered cubic space lattice is_____.
- A. Six
- B. Twelve
- C. Eighteen
- D. Twenty
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Induction hardening is the process of_____.
- A. Hardening surface of work-piece to obtain hard and wear resistant surface
- B. Heating and cooling rapidly
- C. Increasing hardness throughout
- D. Inducing hardness by continuous process
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A material is known as allotropic or polymorphic if it_____.
- A. Has a fixed structure under all conditions
- B. Exists in several crystal forms at different temperatures
- C. Responds to heat treatment
- D. Has its atoms distributed in a random pattern
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In a hardening process, the hypo-eutectoid steel is_____.
- 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 closes to the lower critical temperature and then cooled slowly