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Process Control and Instrumentation problems

  • 1. In an exothermic chemical reactor, the manipulated variable is the flow rate of

  • Options
  • A. coolant
  • B. reactants
  • C. product
  • D. none of these
    • Discuss
  • 2. The offset introduced by proportional controller with gain Kcin response of first order system can be reduced by

  • Options
  • A. reducing value of Kc.
  • B. introducing integral control.
  • C. introducing derivative control.
  • D. none of the above.
    • Discuss
  • 3. Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.

  • Options
  • A. < 100
  • B. < 0
  • C. > 0
  • D. > 800
    • Discuss
  • 4. The inverse Laplace transform of the function Chemical Engineering Process Control and Instrumentation: The inverse Laplace transform of the function is

  • Options
  • A. 1 + et
  • B. 1 - et
  • C. 1 + e-t
  • D. 1 - e-t
    • Discuss
  • 5. Dilatometer is used to measure

  • Options
  • A. stress
  • B. strain
  • C. deflection
  • D. contraction/expansion due to changes in temperature
    • Discuss
  • 6. The transfer function of a first order system is

  • Options
  • A.
  • B.
  • C.
  • D. none of these
    • Discuss
  • 7. Optical activity of a solution can be determined using a

  • Options
  • A. polarimeter
  • B. polarograph
  • C. dilatometer
  • D. refractrometer
    • Discuss
  • 8. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as :
    Chemical Engineering Process Control and Instrumentation: Water is entering a storage tank at a temperature T0 and flow rate Q0<

  • Options
  • A. Q0(T0 - T) = Ac .
  • B. Q0T0 - QT = Ac .
  • C. Q(T0 - T) = Ac .
  • D. Q(T0 - T) = Ac .
    • Discuss
  • 9. __________ stability method uses open loop transfer function.

  • Options
  • A. Nyquist
  • B. Mikhalov
  • C. Ruth
  • D. none of these
    • Discuss
  • 10. Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

  • Options
  • A. CO2
  • B. N2
  • C. O2
  • D. CO
    • Discuss

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