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Chemical Engineering :: Process Control and Instrumentation

  1. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

  2. A.
    -38.9
    B.
    -11.9
    C.
    -60.9
    D.
    -80.9

  3. __________ controller has the maximum stabilising time.

  4. A.
    P
    B.
    PD
    C.
    PI
    D.
    PID

  5. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

  6. A.
    mercury in glass thermometer.
    B.
    optical pyrometer.
    C.
    iron-constantan thermocouple.
    D.
    alcohol filled thermometer.

  7. Stalagmometer is used for the measurement of

  8. A.
    kinematic viscosity
    B.
    surface tension
    C.
    refractive index
    D.
    optical activity

  9. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

  10. A.
    d
    B.
    d2
    C.
    d3
    D.
    d4

  11. Working principle of radiation pyrometer is based on the

  12. A.
    Wien's law
    B.
    Kirchoffs law
    C.
    stefan-Boltzman law
    D.
    Seebeck effect

  13. Liquid levels in autocalves are measued by

  14. A.
    simple float
    B.
    differential float type manometer
    C.
    glass gauge
    D.
    none of these

  15. E.m.f. generated by thermocouples is of the order of

  16. A.
    millivolts
    B.
    microvolts
    C.
    volts
    D.
    kilo volts

  17. A pyrheliometer is an instrument used for measuring the

  18. A.
    bright sunshine period.
    B.
    beam radiation.
    C.
    diffuse radiation.
    D.
    none of these.

  19. Flow rate through an orifice is __________ the pressure differential.

  20. A.
    proportional to
    B.
    inversely proportional to the square root of
    C.
    proportional to the square root of
    D.
    inversely proportional to the square of