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For transducers, following statements are given : (A) An optical interferometer is useful for measuring extremely small motions


65) For transducers, following statements are given :

  • (A) An optical interferometer is useful for measuring extremely small motions
  • (B) The damping ratio of a seismic instrument should be low for good dynamic performance
  • (C) A rate gyro is a relative motion measuring device
  • (D) A pneumatic motion transducer is non linear over a wide range of motion
  • (E) A piezoelectric accelerometer can only be used for static motion measurement

Choose the correct answer from the options given below :

  • (1) (A) and (B) only
  • (2) (A) and (C) only
  • (3) (A) and (D) only
  • (4) (C) and (E) only
Answer: C

Solution

(A) An optical interferometer is useful for measuring extremely small displacements.

(B) A seismic instrument is used to measure vibration. For good dynamic performance, its damping ratio should be in the range of 0.7 to 1.0 (approximately critically damped).

(C) A rate gyroscope (rate gyro) is used to measure angular velocity (angular motion).

(D) A pneumatic transducer converts an electrical signal (voltage/current) into a proportional pneumatic pressure signal.

(E) A piezoelectric accelerometer is commonly used for vibration and shock measurements.

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