Correct Answer:
B. Ultrasound waves are transmitted towards the fluid surface, and the time it takes for the waves to reflect back to the sensor is used to calculate the fluid level.
Explanation:
- A. Incorrect: Ultrasound waves are used to measure the time it takes for the waves to reflect back from the fluid surface, not to reach the bottom of the tank.
- B. Correct: This method accurately describes how ultrasound level sensors work. The sensor emits ultrasound waves towards the fluid surface, and the time delay of the reflected signal is used to determine the fluid level.
- C. Incorrect: Ultrasound level measurement does not rely on energy absorption by the fluid.
- D. Incorrect: Ultrasound waves are directed towards the fluid surface rather than along the tank walls to measure fluid level.
Correct Answer:
B. Ultrasound waves are transmitted towards the fluid surface, and the time it takes for the waves to reflect back to the sensor is used to calculate the fluid level.
Explanation:
- A. Incorrect: Ultrasound waves are used to measure the time it takes for the waves to reflect back from the fluid surface, not to reach the bottom of the tank.
- B. Correct: This method accurately describes how ultrasound level sensors work. The sensor emits ultrasound waves towards the fluid surface, and the time delay of the reflected signal is used to determine the fluid level.
- C. Incorrect: Ultrasound level measurement does not rely on energy absorption by the fluid.
- D. Incorrect: Ultrasound waves are directed towards the fluid surface rather than along the tank walls to measure fluid level.