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Process Control and Instrumentation problems

  • 1. In second order underdamped system,

  • Options
  • A. decay ratio = overshoot
  • B. decay ratio = (overshoot)2
  • C. overshoot increases for increasing damping co-efficient.
  • D. large damping co-efficient means smaller damping.
    • Discuss
  • 2. Temperature of __________ can not be measured by an optical or radiation pyrometer.

  • Options
  • A. hot blast (air) from stoves
  • B. molten slag flowing out of blast furnace
  • C. combustion space in boilers
  • D. rotary limestone calcination kiln
    • Discuss
  • 3. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

  • Options
  • A. filling nitrogen under pressure in the stem.
  • B. increasing the diameter of the tube.
  • C. using steel tube in place of glass tube.
  • D. accounting for the tube expansion.
    • Discuss
  • 4. The frequency at which maximum amplitude ratio is attained is called the __________ frequency.

  • Options
  • A. corner
  • B. resonant
  • C. cross-over
  • D. natural
    • Discuss
  • 5. For the time domain function f(t) = t, the Laplace transform ofChemical Engineering Process Control and Instrumentation: For the time domain function f(t) = t, the Laplace transform of is given by

  • Options
  • A. 1/2 S3
  • B. 2/S3
  • C. 1/S3
  • D. 2/S2
    • Discuss
  • 6. A first order system with unity gain and time constant ? is subjected to a sinusoidal input of frequency w = 1/?. The amplitude ratio for this system is

  • Options
  • A. 1
  • B. 0.5
  • C. 1/2
  • D. 0.25
    • Discuss
  • 7. Find the Laplace transform of the following input function shown in figure.
    Chemical Engineering Process Control and Instrumentation: Find the Laplace transform of the following input function shown in figure.

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 8. Change of angle of refraction with composition comprises the working principle of a

  • Options
  • A. polarimeter
  • B. polarograph
  • C. spectrometer
  • D. refractrometer
    • Discuss
  • 9. The thermal emf-temperature relationship of most thermocouples is

  • Options
  • A. linear
  • B. parabolic
  • C. exponential
  • D. square root
    • Discuss
  • 10. A system with transfer function Chemical Engineering Process Control and Instrumentation: A system with transfer function is of __________ order.

  • Options
  • A. zero
  • B. 1st
  • C. 2nd
  • D. 3rd
    • Discuss

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