Process control loop Basics - Instrumentation Lesson 2

What are the main types of process variables mentioned?

• Speed, Frequency, Acceleration, Force

• Pressure, Level, Temperature, Flow

• Voltage, Current, Resistance, Power

• Humidity, Viscosity, Density, Radiation

What is the purpose of using process variables in a control loop?

• To maintain a desired setpoint

• To reduce the cost of raw materials

• To increase the efficiency of energy consumption

• To monitor the performance of the plant staff

What is the function of a High Integrity Pressure Protection System (HIPPS)?

• To measure the integrity of the plant's security system

• To increase the pressure in industrial processes

• To control the flow of liquids in the plant

• To protect pipe work or vessels from over pressurization

Why are local indicators like pressure gauges used in plants?

• To save electrical energy

• To reduce the reliance on digital systems

• To provide operators with a direct view of process conditions

• To decorate the control room

What role do transmitters play in a control system?

• Convert process variables into understandable signals

• Increase the speed of the control system

• Decrease the energy consumption of the plant

• Protect the plant from external threats

How do pneumatic transmitters signal?

• By changing the color of the output

• By emitting sound waves

• By regulating output pressure

• By generating heat

Which signal type is most common in modern equipment?

• 4 to 20 milliamps

• 0 to 10 volts

• RS-232

• Pneumatic

What is the purpose of using HART protocol in transmitters?

• To reduce the signal noise

• To increase the data transfer speed

• To encrypt the data being transmitted

• To transmit a communication protocol over a DC current signal

What is the role of a SCADA system in relation to transmitters?

• To control the output of transmitters directly

• To display information from transmitters for operational monitoring

• To power the transmitters

• To physically protect the transmitters from damage

What advantage does a 4 milliamp zero signal provide in a transmitter?

• It allows detection of issues like broken cables

• It reduces the power consumption of the transmitter

• It increases the signal strength over long distances

• It simplifies the calibration process