As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

A. 110

B. 85

C. 60

D. 45

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

You can do it
  1. The only suitable method for hardening the low carbon steel is case hardening. Which of the following…
  2. Which of the following has the least value of ultimate tensile strength (UTS)?
  3. Blow off cock is provided in steam boiler to
  4. The type of pump used for lifting large quantity of sewage is a __________ pump.
  5. During sensible heating of humid air
  6. Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
  7. A high pressure boiler generates steam at a pressure greater than __________ kg/cm2.
  8. Faraday's law of electrolysis is related to the
  9. Which of the following forces does not act on a fluid at rest?
  10. In electrical resistance welding, distortion results from the use of improper
  11. Carbon supply in pack carburising process is in the form of
  12. Which of the following is preferred for riveting?
  13. Pick out the wrong statement.
  14. Cast iron contains __________ percent carbon.
  15. Wavelength of radiation emitted by a body depends on the __________ of its surface.
  16. Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
  17. __________ has a negative co-efficient of linear expansion.
  18. __________ joint is mostly used for joining pipes carrying water at low pressure.
  19. Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.A.…
  20. Dislocation cross-slip is difficult in those materials, which have
  21. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates,…
  22. The activity co-efficient of the solute in a dilute solution
  23. Triple point of water is
  24. The refrigerant freon-12 is chemically
  25. Which of the following is the most suitable material of construction for the condenser tubes, where…
  26. Which of the following materials has the maximum shrinkage allowance?
  27. Consideration of the creep is the most important in case of the
  28. As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint…
  29. Eutectoid composition of carbon steel at room temperature is
  30. Rain drops falling through atmospheric air attain limited terminal velocity, because of