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Chemical Engineering :: Process Control and Instrumentation

  1. Configuration of Bourdon spring tube is never made of __________ shape.

  2. A.
    circular
    B.
    semi-circular
    C.
    helical
    D.
    spiral

  3. Thermodynamic celcius scale of temperature measurement is

  4. A.
    defined on the basis of melting point of ice and evaporation temperature of water vapor.
    B.
    defined on the basis of melting point of ice and condensation temperature of water vapor.
    C.
    having an interval of 100° between ice point to steam point.
    D.
    both (b) and (c)

  5. According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

  6. A.
    B.
    45°
    C.
    90°
    D.
    180°

  7. In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit

  8. A.
    overdamped response.
    B.
    underdamped response.
    C.
    undamped response.
    D.
    unstable response.

  9. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)


  10. Measurement of pressure in ammonia reactor is done by

  11. A.
    Bourdon gauge
    B.
    U-tube manometer
    C.
    Inclined tube manometer
    D.
    Pirani guage

  12. The fluid used in hydraulic controller is

  13. A.
    water
    B.
    steam
    C.
    air
    D.
    oil

  14. Flow rate of a river is measured by a/an

  15. A.
    pitot tube
    B.
    vane meter
    C.
    kennison nozzle
    D.
    open weir

  16. Which of the following thermocouple materials does not contain nickel ?

  17. A.
    Alumel
    B.
    Chromel
    C.
    Constantan
    D.
    None of these.

  18. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

  19. A.
    magnetic flowmeter
    B.
    pitot tube
    C.
    flow nozzle type flowmeter
    D.
    turbine flowmeter