9.0       For transducers, following statements are given.            (A) An optical interferometer is useful for measuring extremely small motions.            (B) The damping ration 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 measurementChoose the correct answers from the following options given below:

The question seems to be incomplete as there are no options provided to choose the correct answers from. However, I can provide some insights on the statements given:

(A) True. An optical interferometer is indeed useful for measuring extremely small motions. It uses the principle of interference of light waves to measure small displacements, refractive index changes and surface irregularities in optics and experimental physics.

(B) False. The damping ratio of a seismic instrument should be high for good dynamic performance. Damping is used in seismic instruments to prevent excessive motion of the seismic mass and to bring it to rest position quickly.

(C) True. A rate gyro is a relative motion measuring device. It measures the rate of change of angular position over time, i.e., angular velocity.

(D) True. A pneumatic motion transducer can be non-linear over a wide range of motion. The output of a pneumatic transducer is a function of the square of the input, hence it is non-linear.

(E) False. A piezoelectric accelerometer is used for dynamic motion measurement, not static. It measures the rate of change of velocity with respect to time (acceleration) which is a dynamic quantity.