A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

A. Lack of free

B. Excess of

C. Decrease in

D. None of these

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. Oxygen cylinders used for autogenous (cutting/welding) purposes are
  2. Thermit welding is categorised as the __________ welding.
  3. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C…
  4. A material being tested for endurance strength is subjected to the __________ load.
  5. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb…
  6. Joining of thin foils is preferred to be done by
  7. Specific __________ is a dimensionless quantity.
  8. Sub zero treatment of steel is done to
  9. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
  10. Gantt charts are used for streamlining the
  11. With increase in annealing temperature, the following defect density decreases.
  12. Electrometallurgy is not involved in the extraction of __________ from its ore.
  13. Which of the following materials has the poorest electrical conductivity?
  14. Increase in temperature, in general results in the
  15. Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.
  16. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
  17. Heat required to raise the temperature of a body by 1 °C is called its
  18. Between 230 and 370°C, blue brittleness is caused in mild steel because of the
  19. at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of…
  20. Which one can be directly solidified from gaseous state without entering into liquid state?
  21. Routing in production, planning & control is concerned with the
  22. Vernier calipers cannot be used to measure the
  23. Which of the following commonly used condenser tube materials has the lowest thermal conductivity?
  24. Encyclopaedia of Chemical Technology has been
  25. Drills are usually made of
  26. Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying…
  27. Which of the following is an acidic constituent of B.F. slag?
  28. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________…
  29. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative…
  30. Calorific value of __________ are almost same.