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Chemical Engineering :: Process Control and Instrumentation

  1. Conversion formula for converting amplitude ratio (AR) into decibels is

  2. A.
    Decibel = 20 log10 (AR)
    B.
    Decibel = 20 loge (AR)
    C.
    Decibel = 20 log10 (AR)0.5
    D.
    Decibel = 20 loge (AR)0.5

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  3. A manometer measures the __________ pressure.

  4. A.
    atmospheric
    B.
    absolute
    C.
    gauge
    D.
    none of these

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  5. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

  6. A.
    filling nitrogen under pressure in the stem.
    B.
    increasing the diameter of the tube.
    C.
    using steel tube in place of glass tube.
    D.
    accounting for the tube expansion.

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  7. Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a

  8. A.
    Beckman thermometer
    B.
    dilatometer
    C.
    mercury thermometer
    D.
    bimetallic thermometer

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  9. For the time domain function f(t) = t, the Laplace transform of is given by

  10. A.
    1/2 S3
    B.
    2/S3
    C.
    1/S3
    D.
    2/S2

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  11. Temperature of __________ can not be measured by an optical or radiation pyrometer.

  12. A.
    hot blast (air) from stoves
    B.
    molten slag flowing out of blast furnace
    C.
    combustion space in boilers
    D.
    rotary limestone calcination kiln

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  13. Gain margin is equal to the

  14. A.
    amplitude ratio
    B.
    reciprocal of amplitude ratio
    C.
    gain in P controller
    D.
    gain in P-I controller

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  15. A system with transfer function is of __________ order.

  16. A.
    zero
    B.
    1st
    C.
    2nd
    D.
    3rd

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  17. In Bode plot, Φ vs ω is plotted on a/an __________ graph paper.

  18. A.
    log-log
    B.
    ordinary
    C.
    semi-log
    D.
    triangular

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  19. Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

  20. A.
    chromel-alumel thermocouple
    B.
    optical pyrometer
    C.
    radiation pyrometer
    D.
    either (b) or (c)

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