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Chemical Engineering :: Process Control and Instrumentation

  1. The temperature range for which copper resistance thermometer can be used is __________ °C

  2. A.
    0 to 150
    B.
    -200 to 150
    C.
    350 to 750
    D.
    500 to 900

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  3. Paramagnetism method is not used for the composition determination of __________ in gases.

  4. A.
    oxygen
    B.
    oxides of nitrogen
    C.
    carbon dioxide
    D.
    any of these

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  5. An amplitude ratio of 0.1 corresponds to __________ decibels.

  6. A.
    20
    B.
    -20
    C.
    10
    D.
    -10

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  7. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

  8. A.
    large area but small mass.
    B.
    high thermal conductivity.
    C.
    small specific heat.
    D.
    all'a', 'b' & 'c'.

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  9. Pressure of 0.0001 absolute psi can be measured by __________ gauge.

  10. A.
    Mcloid
    B.
    Pirani
    C.
    thermocouple
    D.
    none of these

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  11. Pirani gauge is used for the measurement of

  12. A.
    very high pressure.
    B.
    high vacuum.
    C.
    liquid level under pressure.
    D.
    liquid level at atmospheric pressure

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  13. The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

  14. A.
    pressure
    B.
    volume
    C.
    viscosity
    D.
    all (a), (b) and (c)

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  15. Transfer functions X/Y for which of the following block diagrams is

  16. A.
    B.
    C.
    D.
    none of these

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  17. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system

  18. A.
    depends only upon the open loop transfer function.
    B.
    determines its stability.
    C.
    is the same for set point or load changes.
    D.
    all 'a', 'b' & 'c'

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  19. __________ thermometer can not measure sub-zero (< 0° C) temperature,

  20. A.
    Mercury in glass
    B.
    Bimetallic
    C.
    Vapor pressure
    D.
    Resistance

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