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  • Question
  • 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
    In a second order under damped system, the time required for the response of first reach its ultimat

  • Correct Answer
  • overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e. 


  • Process Control and Instrumentation problems


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    • 1. 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
    • 2. All the thermocouples used for temperature measurement use dissimilar metal

    • Options
    • A. strips
    • B. bars
    • C. wires
    • D. beads
    • Discuss
    • 3. Bourdon gauges are used for measuring pressure (kg/cm2 )

    • Options
    • A. < atmospheric
    • B. > 2 (gauge)
    • C. < 2 (gauge)
    • D. > 10 (absolute)
    • Discuss
    • 4. Mercury thermometer can be used to measure the temperature upto __________ °C.

    • Options
    • A. 100
    • B. 250
    • C. 350
    • D. 750
    • Discuss
    • 5. Very low pressure is expressed in microns(?), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

    • Options
    • A. 0.0001
    • B. 0.001
    • C. 0.01
    • D. 0.1
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. The inverse Laplace transform of the function is

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

    • Options
    • A. stress
    • B. strain
    • C. deflection
    • D. contraction/expansion due to changes in temperature
    • Discuss


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