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The best lubricants for a machine working at high temperature & load is

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

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

You can do it
  1. Maximum consumption of limestone is in the __________ industry.
  2. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
  3. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.
  4. Pick out the wrong statement.
  5. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other…
  6. For the Stoke's law to be valid in the case of a falling sphere in a fluid, the
  7. An abrupt and sudden fall in the reading of barometer is an indication of the
  8. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________…
  9. Fibre reinforced plastic (FRP) are
  10. Titanium is added to molten aluminium alloys before casting for the purpose of
  11. The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
  12. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold…
  13. The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
  14. The specific gravity of coal depends mainly on its __________ content.
  15. As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint…
  16. Which of the following processes follows the hardening process for reducing the hardening strains &…
  17. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates,…
  18. Plants produce carbohydrates from the CO2 present in the atmosphere by
  19. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through…
  20. Factor of safety is the ratio of the __________ stress to the working stress.
  21. X-rays are
  22. The main constituent of bones is
  23. Percentage of argon (by volume) in dry atmospheric air is about
  24. Dew point temperature always gives an indication of the __________ of the moist air.
  25. __________ is the process used for setting up compressive stresses in the surface of a metal to improve…
  26. Hot extrusion of aluminium is done in the temperature range of __________ °C.
  27. The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic…
  28. Steels with high carbon equivalent have poor Weldability, because in these steels during welding
  29. Dephosphorization of molten pig iron is favoured by
  30. Tesla metre per ampere (T. m/A) is the unit for the measurement of