Aneroid manometers use ________ to measure pressure
a. a vacuum chamber with a flexible dia-phragm
b. capacitance and changes in output voltage
c. changes in inductance of two coils
d. a Wheatstone bridge circuit
ANS: A
An aneroid manometer consists of a vacuum chamber with a flexible cover or diaphragm that flexes when pressure is applied to it. Electromechanical transducers use variable capacitance; strain gauge pressure transducers use Wheatstone bridge circuits; and variable inductance trans-ducers use the magnetic flux between two coils to measure pressure.
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