Which type of level gauge works on the principle of sonic waves?
A. Sight glass level gauge
B. Float level gauge
C. Ultrasonic level gauge
D. Capacitance level gauge
Answer:C
Which type of level gauge works on the principle of sonic waves?
A. Sight glass level gauge B. Float level gauge C. Ultrasonic level gauge D. Capacitance level gauge
Explanation: Ultrasonic level gauges work on the principle of sonic or ultrasonic waves. They send out a pulse of sound waves that bounce off the liquid surface and are reflected back to the gauge. The time taken for the waves to travel back is used to determine the level of the liquid.