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Process Control and Instrumentation problems

  • 1. 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
  • 2. Which of the following is a 'contact' pyrometer?

  • Options
  • A. resistance pyrometer
  • B. optical pyrometer
  • C. radiation pyrometer
  • D. infra red pyrometer
    • Discuss
  • 3. On-off controllers are normally used for

  • Options
  • A. low loads
  • B. temperature changes
  • C. flow rate changes
  • D. none of these
    • Discuss
  • 4. Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

  • Options
  • A. ionisation
  • B. Pirani
  • C. Mcloid
  • D. none of these
    • Discuss
  • 5. 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'.
    • 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 :
    Chemical Engineering Process Control and Instrumentation: 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 Chemical Engineering Process Control and Instrumentation: 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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