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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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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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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45. .......... cannot be the final control element
A. Potentiometer
B. Electro-pneumatic converter
C. Servomotor
D. All of the above
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