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Drills are usually made of

A. Cermets

B. High speed steel

C. Alloy steel

D. Tungsten carbide

Correct Answer : B.


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  1. The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
  2. 'Ice point' is designated on Fahrenheit temperature scale by
  3. The 'laughing gas' is
  4. Which of the following is the most wear resistant grade of carbide used for the cutting tools?
  5. Which of the following is not an explosive?
  6. A reduction in thermal resistance during heat transfer does not occur in the
  7. Out of the following, the best material capable of withstanding shock & vibration without the danger…
  8. Runge-Kutta method is used to solve a/an
  9. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and…
  10. Air-petrol ratio for maximum power generation in spark ignition engine is about
  11. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
  12. Faraday's law of electrolysis is related to the
  13. Surface tension of a liquid
  14. Holes for riveting purposes should be preferably made by
  15. Which of the following pairs is not correctly matched?
  16. With increase in annealing temperature, the following defect density decreases.
  17. The co-ordination number in simple cubic structure is
  18. The value of for air & most common gases can be safely assumed to be
  19. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.
  20. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________…
  21. Steel produced from phosphatic iron is __________ in nature.
  22. Primary designation of steel is based on its
  23. Propulsion of rocket follows from the
  24. 'Amortization' in respect of financial obligation of a company means the
  25. Ultimate strength in tension as compared to that in shear for steel is
  26. The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
  27. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________…
  28. Change in volume of metals from absolute zero temperature to their melting points is
  29. A dense structure of grinding wheel is not used for the
  30. A material being tested for endurance strength is subjected to the __________ load.