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  • Question

  • Mercury thermometer can be used to measure the temperature upto __________ °C.


  • Options
  • A. 100
  • B. 250
  • C. 350
  • D. 750

  • Correct Answer
  • 350 

    • Process Control and Instrumentation problems

    Search Results

    • 1. Very low pressure is expressed in microns(?), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

    • Options
    • A. 0.0001
    • B. 0.001
    • C. 0.01
    • D. 0.1
      • Discuss
    • 2. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

    • Options
    • A. Water
    • B. Mercury
    • C. Methyl alcohal
    • D. Carbon-tetrachloride
      • Discuss
    • 3. Which of the following does not figure in the list of seven substances selected for international temperature scale?

    • Options
    • A. Ice (F.P) and steam (B.P)
    • B. Oxygen and sulphur (B.P)
    • C. Antimony and silver (F.P)
    • D. Zinc (B.P) and mercury (F.P)
      • Discuss
    • 4. An aneroid barometer measures the __________ pressure.

    • Options
    • A. atmospheric
    • B. absolute
    • C. vacuum
    • D. gage
      • Discuss
    • 5. A pyranometer is an instrument used for measuring the

    • Options
    • A. beam radiation.
    • B. global radiation.
    • C. bright sunshine period.
    • D. none of these.
      • Discuss
    • 6. Bourdon gauges are used for measuring pressure (kg/cm2 )

    • Options
    • A. < atmospheric
    • B. > 2 (gauge)
    • C. < 2 (gauge)
    • D. > 10 (absolute)
      • Discuss
    • 7. All the thermocouples used for temperature measurement use dissimilar metal

    • Options
    • A. strips
    • B. bars
    • C. wires
    • D. beads
      • Discuss
    • 8. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

    • Options
    • A. 5?/12
    • B. ?/6
    • C. ?/12
    • D. ?/3
      • Discuss
    • 9. In a second order under damped system, the

    • Options
    • A. time required for the response of first reach its ultimate value is called the response time.
    • B. overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
    • C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
    • D. characteristics of a step response is represented by
      • Discuss
    • 10. In an exothermic chemical reactor, the manipulated variable is the flow rate of

    • Options
    • A. coolant
    • B. reactants
    • C. product
    • D. none of these
      • Discuss

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