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  • Question

  • As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ ?g/m3.(?g-microgram)


  • Options
  • A. 10
  • B. 90
  • C. 800
  • D. 750

  • Correct Answer
  • 90 

    • More questions

    • 1. Extractor temperature is maintained at -20°C in Edeleanu process to reduce the __________ of kerosene.

    • Options
    • A. smoke point
    • B. paraffins
    • C. aromatics
    • D. naphthenes
      • Discuss
    • 2. Maximum viscosity of tar/PCM/fuel oil for easy and efficient atomisation in conventional burner is __________ centistokes (or 100 Redwood I seconds).

    • Options
    • A. 5
    • B. 25
    • C. 50
    • D. 100
      • Discuss
    • 3. Cracking is

    • Options
    • A. an exothermic reaction.
    • B. an endothermic reaction.
    • C. favoured at very low temperature.
    • D. none of these.
      • Discuss
    • 4. A control system has the following transfer function

      The initial value of the corresponding time function is

    • Options
    • A. 1
    • B. 1/8
    • C. 7/8
    • D. -1
      • Discuss
    • 5. Ethyl mercaptan is a/an __________ compound.

    • Options
    • A. sulphur
    • B. nitrogen
    • C. oxygen
    • D. none of these
      • Discuss
    • 6. Higher pressure in the reforming reactor

    • Options
    • A. increases coke formation.
    • B. increases the rate of reaction.
    • C. produces high octane number gasoline.
    • D. none of these.
      • Discuss
    • 7. BET apparatus

    • Options
    • A. measures the catalyst surface area directly.
    • B. operates at very high pressure.
    • C. is made entirely of stainless steel.
    • D. none of these.
      • Discuss
    • 8. The unit of heat transfer co-efficient in SI unit is

    • Options
    • A. J/M2°K
    • B. W/m2°K
    • C. W/m°K
    • D. J/m°K
      • Discuss
    • 9. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.

    • Options
    • A. load
    • B. manipulated
    • C. controlled
    • D. none of these
      • Discuss
    • 10. Response of a linear control system for a change in set point is called

    • Options
    • A. frequency response
    • B. transient response
    • C. servo problem
    • D. regulator problem
      • Discuss

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