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  • Question

  • 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

  • Correct Answer
  • product 

    • Process Control and Instrumentation problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Phase lag of the sinusoidal response of a first order system is

    • Options
    • A. 120°
    • B. 30°
    • C. 180°
    • D. 90°
      • Discuss
    • 4. 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
    • 5. Which is the strongest paramagnetic gas?

    • Options
    • A. CO2
    • B. O2
    • C. NO
    • D. NO2
      • Discuss
    • 6. In Bode plot, ? vs ? is plotted on a/an __________ graph paper.

    • Options
    • A. log-log
    • B. ordinary
    • C. semi-log
    • D. triangular
      • Discuss
    • 7. 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
    • 8. For measuring the temperature of a red hot furnace, which is the most suitable instrument?

    • Options
    • A. Platinum resistance thermometer
    • B. Thermocouple
    • C. Optical pyrometer
    • D. Bimetallic thermometer
      • Discuss
    • 9. 0n-off control which is a special case of proportional control, has a band width of about __________ percent.

    • Options
    • A. 100
    • B. 75
    • C. 25
    • D. 0
      • Discuss
    • 10. The amount of compounded interest during 'n' interest periods is

    • Options
    • A. p[(1+i)n-1)]
    • B. p(1 + i)n
    • C. p(1 - i)n
    • D. p(1 + in)
      • Discuss

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