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  • Question
  • Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to


  • Options
  • A. Reynold stresses
  • B. shear forces
  • C. both (a) & (b)
  • D. neither (a) nor (b)

  • Correct Answer
  • both (a) & (b) 


  • Environmental Engineering problems


    Search Results


    • 1. TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.

    • Options
    • A. 0.1
    • B. 25
    • C. 100
    • D. 1000
    • Discuss
    • 2. Turbidity of water is an indication of the presence of

    • Options
    • A. suspended inorganic matter
    • B. dissolved solids
    • C. floating solids
    • D. dissolved gases
    • Discuss
    • 3. Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called

    • Options
    • A. fumes
    • B. mists
    • C. smoke
    • D. aerosols
    • Discuss
    • 4. Large tonnage of refractory bricks are dried in a

    • Options
    • A. shaft furnace
    • B. rotary hearth furnace
    • C. tunnel kiln
    • D. muffle furnace
    • Discuss
    • 5. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

    • Options
    • A. low emissivity
    • B. high thermal conductivity
    • C. both (a) and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 6. Ionisation potential employed in the industrial electrostatic precipitator is of the order of

    • Options
    • A. 30 to 70 kV DC
    • B. 30 to 70 kV AC
    • C. 230 V AC
    • D. 230 V DC
    • Discuss
    • 7. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by

    • Options
    • A. biological oxygen pond.
    • B. aerated lagoons.
    • C. trickling filters.
    • D. gravity separator having oil skimming devices.
    • Discuss
    • 8. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

    • Options
    • A. hydrocarbons
    • B. hydrogen flouride
    • C. hydrogen sulphides
    • D. nitrogen dioxide
    • Discuss
    • 9. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.

    • Options
    • A. 5
    • B. 500
    • C. 1000
    • D. 2000
    • Discuss
    • 10. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).

    • Options
    • A. 50
    • B. 1000
    • C. 2000
    • D. 5000
    • Discuss


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