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Chemical Engineering :: Process Control and Instrumentation

Process Control and Instrumentation - Section 1
Process Control and Instrumentation - Section 2
Process Control and Instrumentation - Section 3
Process Control and Instrumentation - Section 4
Process Control and Instrumentation - Section 5
Process Control and Instrumentation - Section 6
Process Control and Instrumentation - Section 7

  1. Which of the following measurements can be made by the measurement of emf ?

    2. A.
    pH value
    B.
    Degree of hydrolysis
    C.
    Composition of complex ions
    D.
    All (a), (b) & (c)

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  2. A magnetic flowmeter is

    3. A.
    based on the principle of Faraday's law.
    B.
    capable of measuring the flow rate of slurries and electrolytes.
    C.
    based on the linear relationship between the fluid flow rate and the induced voltage.
    D.
    all (a), (b) and (c).

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  3. Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

    4. A.
    oxygen in
    B.
    carbon dioxide in
    C.
    carbon monoxide in
    D.
    temperature of

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  4. Strain gage pressure transducers are used to measure __________ pressures.

    5. A.
    gage as well as vacuum
    B.
    absolute as well as differential
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  5. The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.)

    6. A.
    Kc(1 + τis + τD ). s
    B.
    C.
    D.

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  6. Compositional analysis of __________ is done using mass spectrometer.

    7. A.
    an isotope
    B.
    natural gas
    C.
    a solid
    D.
    an alloy

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  7. The function of a transducer is to

    8. A.
    modify the input signal.
    B.
    amplify the input signal.
    C.
    convert the primary signal into a more useful quantity, usually an electric impulse.
    D.
    codify/decodify the input signal.

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  8. Nichol's chart deals with

    9. A.
    A.R. vs. phase lag of first order.
    B.
    A.R. vs. phase lag of second order.
    C.
    closed loop values vs. open loop values.
    D.
    frequency response values of controllers.

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  9. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

    10. A.
    Platinum-platinum + rhodium.
    B.
    Iron-constantan.
    C.
    Chromel-constantan.
    D.
    All will give the same output.

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  10. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

    11. A.
    Kc is reduced.
    B.
    Kc is increased.
    C.
    integral control action is introduced.
    D.
    derivative control action is introduced.

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