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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • For an input forcing function, X(t) = 2t2, the Laplace transform of this function is


  • Options
  • A. 2/s2
  • B. 4/s2
  • C. 2/s3
  • D. 4/s3

  • Correct Answer
  • 4/s3 


  • Process Control and Instrumentation problems


    Search Results


    • 1. The __________ of a vapor pressure thermometer is a functioning element.

    • Options
    • A. pointer
    • B. bourdon tube
    • C. bulb
    • D. none of these
    • Discuss
    • 2. The symbol for "capillary line" in instrumentation diagram is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 3. Load cells are used for the measurement of

    • Options
    • A. stress
    • B. weight
    • C. strain
    • D. velocity
    • Discuss
    • 4. Select the correct statement from the following.

    • Options
    • A. The frequency response of a pure capacity process is unbounded.
    • B. The phase lag of a pure time delay system decreases with increasing frequency.
    • C. The amplitude ratio of a pure capacity process is inversely proportional to frequency.
    • D. The amplitude ratio of a pure time delay system increases with frequency.
    • Discuss
    • 5. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

    • Options
    • A. Radiation/infrared pyrometer
    • B. Filled system thermometer
    • C. Mercury in glass thermometer
    • D. Thermo electric pyrometer
    • Discuss
    • 6. Temperature measuring instruments are standardised mostly with __________ points of pure substances.

    • Options
    • A. melting
    • B. boiling
    • C. both (a) & (b)
    • D. neither (a) nor (b)
    • Discuss
    • 7. Pick out the one which is a first order instrument.

    • Options
    • A. Mercury in glass thermometer (without any covering or air gap).
    • B. Bare metallic thermometer.
    • C. Bare vapor pressure thermometer.
    • D. All (a), (b) and (c).
    • Discuss
    • 8. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.

    • Options
    • A. load
    • B. controlled
    • C. manipulated
    • D. none of these
    • Discuss
    • 9. Typical specifications for design stipulates the gain margin and phase margin to be respectively

    • Options
    • A. > 1.7 and > 30°
    • B. < 1.7 and > 30°
    • C. < 1.7 and < 30°
    • D. > 1.7 and < 30°
    • Discuss
    • 10. __________ is undesirable in thermocouples used in industries,

    • Options
    • A. Linear relation of emf to temperature
    • B. Corrosion resistance
    • C. Oxidation resistance
    • D. Non-linear relation of emf to temperature
    • Discuss


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