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  • Question

  • Phase lag of the sinusoidal response of a first order system is


  • Options
  • A. 120°
  • B. 30°
  • C. 180°
  • D. 90°

  • Correct Answer
  • 90° 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

    • Options
    • A. Chromel-alumel
    • B. Iron-constantan
    • C. Platinum-platinum + rhodium
    • D. Copper-constantan
      • Discuss
    • 2. Which is the strongest paramagnetic gas?

    • Options
    • A. CO2
    • B. O2
    • C. NO
    • D. NO2
      • Discuss
    • 3. Composition of natural gas is determined by the

    • Options
    • A. Haldane apparatus
    • B. mass spectrometer
    • C. chromatograph
    • D. both (b) and (c)
      • Discuss
    • 4. Working principle of mercury in glass thermometer is

    • Options
    • A. volumetric expansion.
    • B. pressure rise with temperature.
    • C. linear expansion.
    • D. none of these.
      • Discuss
    • 5. Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

    • Options
    • A. steel
    • B. vycor (a glass)
    • C. nichrome
    • D. inconel
      • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. In Bode plot, ? vs ? is plotted on a/an __________ graph paper.

    • Options
    • A. log-log
    • B. ordinary
    • C. semi-log
    • D. triangular
      • Discuss
    • 10. 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.
      • Discuss

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