Pressure Measurement Instruments
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Questions and Answers

What is the primary purpose of the porcelain insulator in a resistance thermometer?

  • To amplify the temperature signal from the platinum wire
  • To provide mechanical support to the platinum wire
  • To provide electrical insulation between the platinum wire and the metal sheath (correct)
  • To increase the thermal conductivity of the instrument
  • What is the effect of temperature change on the platinum wire in a resistance thermometer?

  • It increases the wire's resistance proportionally (correct)
  • It decreases the wire's resistance
  • It changes the wire's resistance randomly
  • It has no effect on the wire's resistance
  • What is the temperature range of a resistance thermometer?

  • -200 to 650°C (correct)
  • 500 to 1000°C
  • 20 to 100°C
  • 0 to 200°C
  • What is the advantage of a resistance thermometer over other temperature measurement instruments?

    <p>High accuracy and fast response</p> Signup and view all the answers

    What is the principle behind the working of a thermocouple?

    <p>Thermoelectric effect</p> Signup and view all the answers

    What is the primary material used in the construction of the C-type Bourdon tube pressure gauge?

    <p>Phosphor bronze</p> Signup and view all the answers

    What is the disadvantage of using a bridge circuit with a resistance thermometer?

    <p>Result in slight inaccuracy due to current flowing through the bridge circuit</p> Signup and view all the answers

    What is the purpose of the linkage and lever mechanism in the C-type Bourdon tube pressure gauge?

    <p>To operate the pointer</p> Signup and view all the answers

    What happens to the shape of the Bourdon tube when the fluid under pressure enters it?

    <p>It changes from oval to circular</p> Signup and view all the answers

    What is the purpose of the multiplication adjustment in the Bourdon tube?

    <p>To match the linear tip movement with the rotational pointer movement</p> Signup and view all the answers

    What is the effect of a shorter lever on the Bourdon tube's operation?

    <p>It increases the rotation of the pointer for the same amount of tip travel</p> Signup and view all the answers

    How is the pressure connection made in the C-type Bourdon tube pressure gauge?

    <p>Through a socket at the base of the tube</p> Signup and view all the answers

    What is the primary function of a strain gauge?

    <p>To convert mechanical displacement into a change of resistance</p> Signup and view all the answers

    What is the purpose of a Wheatstone bridge in a strain gauge circuit?

    <p>To convert the resistance change into a voltage</p> Signup and view all the answers

    What is the difference between bonded and unbonded strain gauges?

    <p>Bonded strain gauges are attached to a structure, while unbonded strain gauges are not</p> Signup and view all the answers

    What happens to the wire in a bonded strain gauge when the surface is disturbed?

    <p>The resistance of the wire changes</p> Signup and view all the answers

    What is the limitation of the armature movement in an unbonded strain gauge?

    <p>It can move only in one direction</p> Signup and view all the answers

    What is the material used to bond the paper sheet to the structure in a bonded strain gauge?

    <p>Adhesive material</p> Signup and view all the answers

    What is the function of the LVDT in the given setup?

    <p>To convert ring deflection into a voltage signal</p> Signup and view all the answers

    How do the strain gauges in the strain gauge load cell react to the applied force?

    <p>They decrease in length and increase in cross-sectional area</p> Signup and view all the answers

    What is the purpose of the Rtc in the strain gauge load cell?

    <p>To compensate for the difference in temperature coefficient of resistance of four strain gauges</p> Signup and view all the answers

    What is the advantage of LVDTs mentioned in the text?

    <p>They have relatively high output signal levels and high accuracies</p> Signup and view all the answers

    What is the function of the external bosses A and B in the given setup?

    <p>To apply force to the ring</p> Signup and view all the answers

    What is the purpose of the balancing of the Wheatstone bridge in the strain gauge load cell?

    <p>To provide a linear output voltage with respect to the applied force</p> Signup and view all the answers

    What is the main reason for converting analog signals to digital signals?

    <p>To facilitate processing by the microcontroller</p> Signup and view all the answers

    Which type of ADC is commonly used in general-purpose industrial applications?

    <p>Successive approximation</p> Signup and view all the answers

    What is the primary function of an analog-to-digital converter (ADC)?

    <p>To convert analog signals to digital signals</p> Signup and view all the answers

    What is the characteristic of analog signals in terms of their range of values?

    <p>Infinite range of values</p> Signup and view all the answers

    What is the purpose of the 'Wait' step in the analog-to-digital conversion process?

    <p>To allow the voltage to stabilize</p> Signup and view all the answers

    Which of the following is an example of a physical signal that is typically analog?

    <p>Temperature</p> Signup and view all the answers

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