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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.


  • Options
  • A. < 100
  • B. < 0
  • C. > 0
  • D. > 800

  • Correct Answer
  • < 0 


  • Process Control and Instrumentation problems


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    • 1. 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
    • 2. 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
    • 3. In a second order under damped system, the

    • Options
    • A. time required for the response of first reach its ultimate value is called the response time.
    • B. overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
    • C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
    • D. characteristics of a step response is represented by
    • Discuss
    • 4. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

    • Options
    • A. 5?/12
    • B. ?/6
    • C. ?/12
    • D. ?/3
    • Discuss
    • 5. All the thermocouples used for temperature measurement use dissimilar metal

    • Options
    • A. strips
    • B. bars
    • C. wires
    • D. beads
    • Discuss
    • 6. The inverse Laplace transform of the function is

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

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

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

    • Options
    • A. polarimeter
    • B. polarograph
    • C. dilatometer
    • D. refractrometer
    • Discuss
    • 10. 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 :

    • Options
    • A. Q0(T0 - T) = Ac .
    • B. Q0T0 - QT = Ac .
    • C. Q(T0 - T) = Ac .
    • D. Q(T0 - T) = Ac .
    • Discuss


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