Measurement Devices Quiz
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Questions and Answers

What is the primary purpose of a revolution counter?

  • Acceleration
  • None of these
  • Displacement
  • Speed (correct)
  • What is the main function of seismic transducers?

  • Displacement
  • Velocity
  • Acceleration
  • All of these (correct)
  • What does a DC tachometer measure?

  • None of these
  • Speed of shaft (correct)
  • Diameter of shaft
  • Length of shaft
  • In which direction(s) can a tachometer encoder measure displacement?

    <p>In both directions</p> Signup and view all the answers

    How many outputs does a tachometer typically have?

    <p>All of these</p> Signup and view all the answers

    What does the polarity of the output in a DC tachometer indicate?

    <p>Both a and b</p> Signup and view all the answers

    What does an RVDT stand for?

    <p>Rotary variable differential Transformer</p> Signup and view all the answers

    Which type of stress is not considered one of the basic types of stress?

    <p>Volumetric stress</p> Signup and view all the answers

    What is the SI unit of speed?

    <p>m/s</p> Signup and view all the answers

    How is speed defined?

    <p>All of these</p> Signup and view all the answers

    What controls the speed of a DC motor?

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

    Into which energy signal does a position sensor convert the measured position in a servomechanism?

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

    In an ideal air compressor cycle with clearance on a p-v diagram, how can the cycle be represented in terms of processes?

    <p>Two adiabatic, one isobaric, and one constant volume</p> Signup and view all the answers

    What happens to the thermal efficiency of a gas turbine for the optimum pressure ratio as the turbine inlet temperature increases?

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

    When the value of the index '«' is decreased, what typically happens to the volumetric efficiency of a compressor?

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

    If atmospheric pressure is 1.03 kg/cm² and the vapor pressure is 0.03 kg/cm², what would be the air pressure?

    <p>1.06 kg/cm²</p> Signup and view all the answers

    Which advantage does an axial flow compressor have over a centrifugal compressor?

    <p>Larger air handling ability per unit frontal area</p> Signup and view all the answers

    Which type of compressor does an axial flow compressor most closely resemble?

    <p>Centrifugal pump</p> Signup and view all the answers

    In a fighter bomber, which type of engine is typically used?

    <p>Turbo-jet</p> Signup and view all the answers

    For a compressor to do the least work, which type of compression would be ideal?

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

    In a two-stage compressor, what happens to the optimum pressure if the compression index of the higher stage is greater than the lower stage?

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

    What is the maximum pressure ratio of an actual single-stage centrifugal compressor typically around?

    <p>01:10</p> Signup and view all the answers

    In an irreversible gas turbine cycle, what factors do both efficiency and work ratio depend on?

    <p>Both pressure ratio and maximum cycle temperature</p> Signup and view all the answers

    For a slow-speed large capacity compressor, which type of valve would be best suited?

    <p>Mechanical valve of the corliss, sleeve, rotary or semirotary type</p> Signup and view all the answers

    Why is clearance volume essential in actual reciprocating compressors?

    <p>To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head</p> Signup and view all the answers

    How is compression efficiency typically compared?

    <p>Isentropic compression</p> Signup and view all the answers

    In a compressor, what should the cylinder clearance ideally be?

    <p>As small as possible</p> Signup and view all the answers

    What is the primary purpose of a diffuser in a compressor?

    <p>Convert kinetic energy into pressure energy</p> Signup and view all the answers

    During base load operation, the best method of controlling a compressor is through:

    <p>Constant speed unloader</p> Signup and view all the answers

    How can the efficiency of a gas turbine be increased?

    <p>All of the above</p> Signup and view all the answers

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