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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is


  • Options
  • A. 12
  • B. 36
  • C. 54
  • D. 68

  • Correct Answer
  • 36 


  • Process Control and Instrumentation problems


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    • 1. Pyrometry refers to the measurement of temperature

    • Options
    • A. with the mercurial thermometer upto 350°C.
    • B. directly.
    • C. which is of higher magnitude.
    • D. all (a), (b) & (c).
    • Discuss
    • 2. The unit of 'time constant' of a system is the same as that of

    • Options
    • A. velocity
    • B. time
    • C. (time)-1
    • D. none of these
    • Discuss
    • 3. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

    • Options
    • A. increases
    • B. decreases
    • C. remains constant
    • D. increases exponentially
    • Discuss
    • 4. Which of the following is not a variable area flow meter?

    • Options
    • A. Piston type meter
    • B. Rotameter
    • C. Magnetic flow meter
    • D. Orifice and tapered plug meter
    • Discuss
    • 5. Which of the following thermocouples has the widest temperature measurement range?

    • Options
    • A. Iron-constantan
    • B. Chromel-alumel
    • C. Copper-constantan
    • D. Platinum-platinum/rhodium
    • Discuss
    • 6. Pick out the symbol for "locally mounted instrument" in instrumentation diagram.

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 7. Thermocouple is suitable for measuring

    • Options
    • A. liquid temperatures only.
    • B. very high temperatures only.
    • C. very low temperatures only.
    • D. both high and low temperatures.
    • Discuss
    • 8. Liquid column manometers are used for measuring the pressure __________ kgf/cm2 .

    • Options
    • A. > 2(gage)
    • B. < 3 (gage)
    • C. < 10 (gage)
    • D. < atmospheric
    • Discuss
    • 9. Platinum resistance thermometer is the international standard for temperature measurement between

    • Options
    • A. triple point of hydrogen and freezing point of antimony
    • B. 13.81°K to 903.9°K
    • C. both (a) and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 10. In second order underdamped system,

    • Options
    • A. decay ratio = overshoot
    • B. decay ratio = (overshoot)2
    • C. overshoot increases for increasing damping co-efficient.
    • D. large damping co-efficient means smaller damping.
    • Discuss


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