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

  • Measurement of sub-zero Celcius temperature in industry is done most commonly by


  • Options
  • A. thermocouples
  • B. resistance thermometers
  • C. gas thermometers
  • D. bi-metallic thermometers

  • Correct Answer
  • resistance thermometers 

    • Process Control and Instrumentation problems

    Search Results

    • 1. __________ are analysed using a polarograph.

    • Options
    • A. Isotonic solutions
    • B. Solids
    • C. Liquids
    • D. Gases
      • Discuss
    • 2. A mercury barometer measures the __________ pressure.

    • Options
    • A. atmospheric
    • B. gauge
    • C. vacuum
    • D. absolute
      • Discuss
    • 3. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function

    • Options
    • A. e-?s
    • B.
    • C.
    • D.
      • Discuss
    • 4. Liquid discharge from a tank or reservoir can not be measured by

    • Options
    • A. orificemeters
    • B. weirs
    • C. mouthpieces
    • D. notches
      • Discuss
    • 5. The transfer function for a first order process with time delay is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. Which of the following is not a mechanical pressure sensing element?

    • Options
    • A. Bellows
    • B. Diaphragm
    • C. Bourdon tube
    • D. U-tube
      • Discuss
    • 7. Pirani gauge is used for the measurement of

    • Options
    • A. very high pressure.
    • B. high vacuum.
    • C. liquid level under pressure.
    • D. liquid level at atmospheric pressure
      • Discuss
    • 8. Transfer functions X/Y for which of the following block diagrams is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 9. Psychrometer determines the

    • Options
    • A. humidity of gases
    • B. moisture content of solids
    • C. water of crystallisation
    • D. hygroscopic nature of solids
      • Discuss
    • 10. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system

    • Options
    • A. depends only upon the open loop transfer function.
    • B. determines its stability.
    • C. is the same for set point or load changes.
    • D. all 'a', 'b' & 'c'
      • Discuss

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