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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is


  • Options
  • A. 0
  • B. 1/2
  • C. 1
  • D. 2

  • Correct Answer
  • 1/2 


  • Process Control and Instrumentation problems


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    • 1. Which of the following thermocouple materials does not contain nickel?

    • Options
    • A. Alumel
    • B. Chromel
    • C. Constantan
    • D. None of these.
    • Discuss
    • 2. Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the

    • Options
    • A. enhancement or attentuation of redia-tion occurs in the sighting path.
    • B. object and surrounding are at almost the same temperature.
    • C. object has varying emissivity.
    • D. object is transparent.
    • Discuss
    • 3. A non-linear chemical system is exemplified by a/an

    • Options
    • A. isothermal CSTR
    • B. mixer
    • C. non-isothermal CSTR
    • D. none of these
    • Discuss
    • 4. The time constant of a first order process with resistance R and capacitance C is

    • Options
    • A. R + C
    • B. R - C
    • C. RC
    • D. 1/RC
    • Discuss
    • 5. Bode diagram is a plot of

    • Options
    • A. log (AR) vs. log (f) and (?) vs. log (f).
    • B. log (AR) vs. f and log ? vs.f.
    • C. AR vs. log (f) and ? vs. log (f).
    • D. none of these.
    • Discuss
    • 6. Which of the following thermometers is not suitable for distant reading upto 60 metres?

    • Options
    • A. Vapor pressure thermometer
    • B. Mercury in glass thermometer
    • C. Constant volume gas thermometer
    • D. Resistance thermometer
    • Discuss
    • 7. Liquid flow rate in a small channel is best measured by a/an

    • Options
    • A. weir
    • B. pitot tube
    • C. vane meter
    • D. venturimeter
    • Discuss
    • 8. A barometer measures the __________ pressure.

    • Options
    • A. absolute
    • B. gauge
    • C. absolute as well as gauge
    • D. dynamic
    • Discuss
    • 9. Radiation pyrometers as compared to thermocouples

    • Options
    • A. has a slower speed of response.
    • B. can measure higher temperature.
    • C. can't measure the temperature of moving objects.
    • D. is more affected by corrosive atmosphere.
    • Discuss
    • 10. Pick out the wrong statement

    • Options
    • A. Proportional controller is normally used for level control in industrial applications.
    • B. CSTR can be considered as a distributed parameter system.
    • C. Distributed parameter approach gives partial differential equation.
    • D. Non-linear behaviour is exemplified by an on-off controller.
    • Discuss


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