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Chemical Engineering :: Process Control and Instrumentation

  1. Starting temperature of optical radiation pyrometer is __________ °C.

  2. A.
    800
    B.
    400
    C.
    1200
    D.
    1500

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  3. Liquid argon level in a pressurised storage tank (at 3 kg/cm2 ) is measured by a/an

  4. A.
    gage glass
    B.
    external float gage
    C.
    differential pressure gage
    D.
    none of these

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  5. Which of the systems having following transfer functions is stable?

  6. A.
    1/(s2+ 2)
    B.
    1/(s2-2s + 3)
    C.
    1/(s2 + 2s + 2)
    D.
    exp(-20s)/(s2 + 2s-l)

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  7. What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?

  8. A.
    0.5 AT
    B.
    2 AT
    C.
    AT
    D.
    1.5 AT

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  9. The transfer function for a first order process with time delay is

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  11. An ideal PID controller has the transfer function . The frequency at which the magnitude ratio of the controller is 1, is

  12. A.
    0.5/0.2
    B.
    0.2/0.5
    C.
    0.2 x 0.5
    D.
    1/0.2 x 0.5

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  13. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

  14. A.
    linear
    B.
    non-linear
    C.
    parabolic
    D.
    hyperbolic

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  15. Alphatron measures pressure __________ microns.

  16. A.
    < 1
    B.
    < 3
    C.
    > 3
    D.
    < 0.1

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  17. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?

  18. A.
    1
    B.
    >1
    C.
    < 1
    D.
    none of these

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  19. The unit step response of the transfer functionreaches its final steady state assymptotically after

  20. A.
    a monotonic increase.
    B.
    a monotonic decrease.
    C.
    initially increasing and then decreasing.
    D.
    increasing decreasing and then increasing.

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