l. in col-wetting the ultrasonic (mechanical vibration wave) into electronic signal, the
(2 of the piezoelectric material is applied; the phcnation of the piezoelectric slice in
the buzzer apply the D ofthe piezoelectric material.
A. stress effect 13. edd
14. A2- -wire 4- 20mA Pressure Transmitter the scepe ofscale lS ONlMPa, Please:
1) Give the expression between pressure p and current I.
2) Sketch the characteristic curve between pressure p and current I.
3) Calculate the current I when ,0 equals to 0 MP
A External B. Internal C. Photovoltaic
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A. Matam B Wyixitli C. itr
9. When the temperatwe increases the dark cunents of the LDR, photosensitive diode and the
i. Eddy current proximity switch may detect the proximity of_ C
2 A. human body B. water C. metai component D. plastic component
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5. When eddy current coil approaches the metal bo