In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

A. Stainless steel

B. Mild steel

C. High speed steel

D. High carbon steel

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

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  1. __________ is the most important element, which controls the physical properties of steel.
  2. Heating of ferromagnetic materials to a temperature above Curie temperature makes it
  3. Alloying elements present in Haynes stellite, which has superior performance than high speed steel,…
  4. Spheroidising of a material is a/an __________ process.
  5. The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
  6. The dew point of moist air becomes __________ with decrease in its relative humidity.
  7. A material subjected __________ must have high resilience.
  8. Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
  9. The most abundant metal present in the earth's crust is;
  10. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
  11. An atom bomb works on the principle of
  12. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the…
  13. Oxyacetylene reducing flame is used while carrying out welding on
  14. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.
  15. Dislocations are __________ defects.
  16. Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
  17. Air-petrol ratio in an automotive petrol engine is around
  18. Silicon percentage in acid resistant cast iron is about
  19. Which of the following fastening devices has a head at one end and a nut fitted to the other?
  20. Case hardening of a material is
  21. Which of the following is the most suitable material of construction for the condenser tubes, where…
  22. Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of
  23. Pick out the wrong statement
  24. With increase in steam pressure, its specific volume decreases
  25. Air-petrol ratio for maximum power generation in spark ignition engine is about
  26. Capacity & power requirement for an air compressor working at high altitude compared to sealevel will…
  27. Dowtherm is a
  28. Which of the following is not a principal alloying element for the structural steel?
  29. Suitability of steel for its use in cable is judged by its strength in
  30. Tip of the match stick contains a mixture of