logo

CuriousTab

CuriousTab

Discussion

Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments
  • Question

  • Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.


  • Options
  • A. mercury thermometer
  • B. bimetallic thermometer
  • C. radiation pyrometer
  • D. none of these

  • Correct Answer
  • bimetallic thermometer 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Feed forward controller accounts for the __________ changes.

    • Options
    • A. set point
    • B. load
    • C. both (a) & (b)
    • D. neither (a) nor (b)
      • Discuss
    • 2. The fluid used in hydraulic controller is

    • Options
    • A. water
    • B. steam
    • C. air
    • D. oil
      • Discuss
    • 3. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

    • Options
    • A. magnetic flowmeter
    • B. pitot tube
    • C. flow nozzle type flowmeter
    • D. turbine flowmeter
      • Discuss
    • 4. 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

    • Options
    • A. 0°
    • B. 45°
    • C. 90°
    • D. 180°
      • Discuss
    • 5. 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)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. The __________ of a vapor pressure thermometer is a primary element.

    • Options
    • A. pointer
    • B. Bourdon tube
    • C. bulb
    • D. none of these
      • Discuss
    • 7. "A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.

    • Options
    • A. Bode stability
    • B. Nyquist
    • C. Routh stability
    • D. none of these
      • Discuss
    • 8. Measurement of pressure in ammonia reactor is done by

    • Options
    • A. Bourdon gauge
    • B. U-tube manometer
    • C. Inclined tube manometer
    • D. Pirani guage
      • Discuss
    • 9. A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is

    • Options
    • A. 2/s
    • B.
    • C.
    • D.
      • Discuss
    • 10. What is the dynamic error in a critically damped second order instrument for a ramp input (At)?

    • Options
    • A. 0.5 AT
    • B. 2 AT
    • C. AT
    • D. 1.5 AT
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.