Red Seal Instrumentation and Control Technician Practice Exam

Which of the following are two common types of flow meters?

1. Ultrasonic flow meters and rotary flow meters

2. Ultrasonic flow meters and magnetic flow meters

3. Thermocouple meters and pressure sensors

4. Capacitive flow meters and inductive flow meters

The correct answer is: Ultrasonic flow meters and magnetic flow meters

Ultrasonic flow meters and magnetic flow meters are indeed two common types of flow measurement devices used in various applications. Ultrasonic flow meters operate by sending ultrasonic sound waves through the fluid. By calculating the time it takes for the sound waves to travel upstream and downstream, these meters can accurately determine the flow rate. This technology is especially effective for measuring fluids that are clean and free from particulates, making them suitable for a wide range of applications, including water and some chemical processes. Magnetic flow meters, on the other hand, are based on Faraday's law of electromagnetic induction. They measure the flow of conductive liquids by generating a magnetic field and measuring the voltage induced as the fluid flows through it. These meters are highly accurate and reliable, especially in applications involving slurries or conductive fluids, and they do not have moving parts, which reduces maintenance. While the other options listed include flow-related technologies, they either involve types of meters that are less common or refer to devices that do not specifically measure flow. Thus, both ultrasonic and magnetic flow meters stand out as widely used and accepted flow measurement technologies across different industries.