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

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


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

  • Correct Answer
  • all'a', 'b' & 'c'. 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

    • Options
    • A. ionisation
    • B. Pirani
    • C. Mcloid
    • D. none of these
      • Discuss
    • 2. On-off controllers are normally used for

    • Options
    • A. low loads
    • B. temperature changes
    • C. flow rate changes
    • D. none of these
      • Discuss
    • 3. Which of the following is a 'contact' pyrometer?

    • Options
    • A. resistance pyrometer
    • B. optical pyrometer
    • C. radiation pyrometer
    • D. infra red pyrometer
      • Discuss
    • 4. 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
    • 5. 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
    • 6. Pressure of 0.0001 absolute psi can be measured by __________ gauge.

    • Options
    • A. Mcloid
    • B. Pirani
    • C. thermocouple
    • D. none of these
      • Discuss
    • 7. For the block diagram shown below :

      The characteristic equation is

    • Options
    • A. ?l S (?ps + 1) + Kc . Kp (?lS + 1) e-?d s = 0
    • B. (?mS + 1) (?pS + 1) + Km . Kp e-?d S = 0
    • C. ?l S(?m S + 1) (?p S + 1) +Kc . Kp . Km (?l s + 1) e-?dS = 0
    • D. (?ms + 1) (?p s + 1) + Kc . Kp . Km . e-?dS = 0
      • Discuss
    • 8. An ideal PID controller has the transfer function . The frequency at which the magnitude ratio of the controller is 1, is

    • Options
    • A. 0.5/0.2
    • B. 0.2/0.5
    • C. 0.2 x 0.5
    • D. 1/0.2 x 0.5
      • Discuss
    • 9. Continuous measurement of moisture in paper is done by

    • Options
    • A. sling psychrometer.
    • B. hair-hygrometer.
    • C. weighing.
    • D. high resistance Wheatstone's bridge circuit.
      • Discuss
    • 10. The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

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

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