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  • Question

  • A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is


  • Options
  • A. 45°
  • B. -90°
  • C. -180°
  • D. -45°

  • Correct Answer
  • -45° 

    • More questions

    • 1. Unit of mass velocity is

    • Options
    • A. kg/m . hr
    • B. kg/m2.hr
    • C. kg/hr
    • D. kg/m2
      • Discuss
    • 2. As per Kirchoff s equation, the heat of reaction is affected by the

    • Options
    • A. pressure
    • B. volume
    • C. temperature
    • D. molecularity
      • Discuss
    • 3. Which of the following is not a component of the fixed capital for a chemical plant facility?

    • Options
    • A. Raw materials inventory.
    • B. Utilities plants.
    • C. Process equipment.
    • D. Emergency facilities.
      • Discuss
    • 4. Dust laden air can be purified using a

    • Options
    • A. cyclone separator
    • B. bag filter
    • C. gravity settler
    • D. tubular centrifuge
      • Discuss
    • 5. Nylon-66 compared to nylon-6 has

    • Options
    • A. lower melting point.
    • B. more abrasion resistant properties.
    • C. higher hardness.
    • D. all (a), (b) and (c).
      • Discuss
    • 6. The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the derivative time.)

    • Options
    • A. Kc(1 + ?is + ?D ). s
    • B.
    • C.
    • D.
      • Discuss
    • 7. Shock resisting steels should possess high

    • Options
    • A. hardness
    • B. toughness
    • C. tensile strength
    • D. wear resistance
      • Discuss
    • 8. The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

    • Options
    • A. 3 to 4
    • B. 8 to 10
    • C. 10 to 15
    • D. 15 to 20
      • Discuss
    • 9. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.

    • Options
    • A. increase by 1.8
    • B. decrease by 22
    • C. increase by 21.6
    • D. none of these
      • Discuss
    • 10. For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become

    • Options
    • A. P/3
    • B. 3P
    • C. 9P2
    • D. 9P
      • Discuss

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