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Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
  • Question

  • Pick out the wrong statement.


  • Options
  • A. There is no transfer lag for a single first order system.
  • B. Stirred tank with a water jacket exemplifies an interacting system.
  • C. Transfer lag is a characteristics of all higher order systems (other than first order systems).
  • D. Transfer lag decreases as the number of stages decreases.

  • Correct Answer
  • Transfer lag decreases as the number of stages decreases. 

    • Process Control and Instrumentation problems

    Search Results

    • 1. In Bode plot, ? vs ? is plotted on a/an __________ graph paper.

    • Options
    • A. log-log
    • B. ordinary
    • C. semi-log
    • D. triangular
      • Discuss
    • 2. For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

    • Options
    • A. product
    • B. ratio
    • C. sum
    • D. difference
      • Discuss
    • 3. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function will have a definite num-ber of loci for variation of K from 0 to ?. The number of loci is

    • Options
    • A. 1
    • B. 3
    • C. 4
    • D. 2
      • Discuss
    • 4. Which of the following can measure temperatures in the range of - 20 to 300°C?

    • Options
    • A. Mercury in glass thermometer
    • B. Vapor pressure thermometer
    • C. Resistance thermometer
    • D. None of these.
      • Discuss
    • 5. Phase lag of the sinusoidal response of a first order system is

    • Options
    • A. 120°
    • B. 30°
    • C. 180°
    • D. 90°
      • Discuss
    • 6. For measuring the temperature of a red hot furnace, which is the most suitable instrument?

    • Options
    • A. Platinum resistance thermometer
    • B. Thermocouple
    • C. Optical pyrometer
    • D. Bimetallic thermometer
      • Discuss
    • 7. 0n-off control which is a special case of proportional control, has a band width of about __________ percent.

    • Options
    • A. 100
    • B. 75
    • C. 25
    • D. 0
      • Discuss
    • 8. The amount of compounded interest during 'n' interest periods is

    • Options
    • A. p[(1+i)n-1)]
    • B. p(1 + i)n
    • C. p(1 - i)n
    • D. p(1 + in)
      • Discuss
    • 9. Fixed capital investment of a chemical plant is the total amount of money needed to supply the necessary plant and manufacturing facilities plus the working capital for operation of the facilities. Which of the following components of fixed capital investment requires minimum percentage of it?

    • Options
    • A. Electrical installation cost.
    • B. Equipment installation cost.
    • C. Cost for piping.
    • D. Equipment insulation cost.
      • Discuss
    • 10. Optimum economic pipe diameter for fluid is determined by the

    • Options
    • A. viscosity of the fluid.
    • B. density of the fluid.
    • C. total cost considerations (pumping cost plus fixed cost of the pipe).
    • D. none of these.
      • Discuss

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