Top 50 Process Loop Components (PLC) Objective Questions and Answers
Top 50 Process Loop Components (PLC) Objective Questions and Answers 1. A basic process control loop will consist of ________ a) Signal converter, resistor, knob, and control valve b) Transducer, valve packing, hex-head wrench, and tubing c) Transmitter, controller, I/P converter, and control valve d) Resistor, capacitor, terminal block, and battery Answer: Transmitter, controller, I/P converter, and control valve 2. In a home heating system, room temperature is ________ A) Setpoint B) Manipulated variable C) Process variable D) Load Variable Answer: Process variable 3. Which is/are the component/s are needed for a 4 mA to 20 mA signal? A) A power supply B) Wire C) A transmitter D) All of the above Answer: All of the above* 4. Identify the proper sequence of valve actions for a three-valve manifold and bleed when taking a differential pressure transmitter out of service: A) Close one block valve, open equalizing valve, close other block valve, open bleed B) Open bleed, close one bl