Menu
Home / Chemical Engineering / Process Control and Instrumentation :: Section 7

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. Dome temperature of blast furnace stove is most accurately measured by a

    2. A.
    radiation pyrometer.
    B.
    platinum-platinum/rhodium ther-mocuple.
    C.
    iron-constantan thermocouple.
    D.
    platinum resistance thermometer.

    View Answer

    Workspace

    Discuss Discuss in Forum

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

    3. A.
    120°
    B.
    30°
    C.
    180°
    D.
    90°

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. Continuous measurement of moisture content of paper in paper industry is done by measuring the

    4. A.
    thermal conductivity through the paper
    B.
    electrical resistance through the paper
    C.
    magnetic susceptibility
    D.
    none of these

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

    5. A.
    steel
    B.
    vycor (a glass)
    C.
    nichrome
    D.
    inconel

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. What is the Laplace transform of sin t ?

    6. View Answer

    Workspace

    Discuss Discuss in Forum

  6. Pick out the wrong statement.

    7. 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.

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. Working principle of mercury in glass thermometer is

    8. A.
    volumetric expansion.
    B.
    pressure rise with temperature.
    C.
    linear expansion.
    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. The frequency at which maximum amplitude ratio is attained is called the __________ frequency.

    9. A.
    corner
    B.
    resonant
    C.
    cross-over
    D.
    natural

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. Which of the following can measure temperatures in the range of - 20 to 300°C ?

    10. A.
    Mercury in glass thermometer
    B.
    Vapor pressure thermometer
    C.
    Resistance thermometer
    D.
    None of these.

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. If response of a control system is to be free of offset and oscillation, the most suitable controller is

    11. A.
    proportional controller.
    B.
    proportional-derivative(PD)controller.
    C.
    proportional-integral (PI) controller.
    D.
    proportional integral-derivative (PID) controller.

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers