Pneumatic Control System Multiple Choice Questions and Answers


41.  In pneumatic systems the medium used is


   A. Air

   B. Liquid

   C. Hydrogen

   D. Oil


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A. Air

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42.  In pneumatic instrumentation systems the pressure of compressed air used is around


   A. 1 bar

   B. 1.4 bar

   C. 2.5 bar

   D. 5.5 bar


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B. 1.4 bar

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43.  In pneumatic systems a restriction-volume combination is equivalent to


   A. R.L. circuit

   B. R.C. circuit

   C. Rectifier

   D. Resonant circuit


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B. R.C. circuit

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44.  In pneumatic-electrical analogy, the electrical resistance is analogous to


   A. Field helical tube

   B. Volume of air

   C. Restriction to flow

   D. None of the above


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C. Restriction to flow

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45.  .......... cannot be the final control element


   A. Potentiometer

   B. Electro-pneumatic converter

   C. Servomotor

   D. All of the above


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A. Potentiometer

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