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  • Question

  • 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.

  • Correct Answer
  • filling nitrogen under pressure in the stem. 

    • Process Control and Instrumentation problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Platinum resistance thermometer is the international standard for temperature measurement between

    • Options
    • A. triple point of hydrogen and freezing point of antimony
    • B. 13.81°K to 903.9°K
    • C. both (a) and (b)
    • D. neither (a) nor (b)
      • Discuss
    • 4. Liquid column manometers are used for measuring the pressure __________ kgf/cm2 .

    • Options
    • A. > 2(gage)
    • B. < 3 (gage)
    • C. < 10 (gage)
    • D. < atmospheric
      • Discuss
    • 5. Thermocouple is suitable for measuring

    • Options
    • A. liquid temperatures only.
    • B. very high temperatures only.
    • C. very low temperatures only.
    • D. both high and low temperatures.
      • Discuss
    • 6. The frequency at which maximum amplitude ratio is attained is called the __________ frequency.

    • Options
    • A. corner
    • B. resonant
    • C. cross-over
    • D. natural
      • Discuss
    • 7. 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
    • 8. 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
    • 9. Find the Laplace transform of the following input function shown in figure.

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

    • Options
    • A. polarimeter
    • B. polarograph
    • C. spectrometer
    • D. refractrometer
      • Discuss

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