PERA Level 0 & 1 Technology Overview and Compromise GICSP Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A chemical plant uses a PLC to control a batch process. The PLC communicates with a remote I/O rack over a fiber optic link. The remote I/O rack has analog input modules for temperature and pressure transmitters. The plant has experienced intermittent loss of communication with the remote I/O rack. Which of the following is the most likely cause?

   • AThe fiber optic cable is damaged or has a loose connection.
   • BThe transmitters are not providing the correct 4-20 mA signal.
   • CThe PLC's power supply is failing.
   • DThe analog input modules are not configured correctly.
   Reveal Solution Discussion Select an answer first
2. 2expert · medium

   A refinery has a DCS that controls a distillation column. The DCS communicates with field devices via a proprietary fieldbus. The security team wants to monitor for anomalies at Level 0 and Level 1. Which of the following approaches provides the MOST comprehensive visibility without disrupting the process?

   • AEnable logging on each field device and collect logs via the DCS.
   • BInstall a passive network tap on the fieldbus segment and analyze traffic with an IDS.
   • CReplace the proprietary fieldbus with Ethernet/IP to simplify monitoring.
   • DDeploy an active scanner to periodically query each field device for configuration changes.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   How does a DCS controller at Level 1 typically interact with Level 0 field devices?

   • AIt provides a web interface for remote access by vendors.
   • BIt only displays data to operators and does not send any control signals.
   • CIt reads process measurements and sends control signals to final control elements.
   • DIt stores data in a relational database for enterprise reporting.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which of the following is an example of an actuator commonly found at Level 0 of an industrial process?

   • AA variable frequency drive (VFD) that controls motor speed.
   • BA remote terminal unit (RTU) that communicates with a SCADA master.
   • CA control valve that adjusts flow based on a 4-20 mA signal.
   • DA pressure gauge with a local analog display.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A water treatment facility uses a PLC to control a chemical dosing pump. The PLC reads a flow meter (4-20 mA) and a level switch (digital). The facility is upgrading the field wiring and wants to reduce the number of wires run to each field device. Which of the following changes would achieve this while maintaining the same control functionality?

   • AUse a single two-wire HART loop for both the flow meter and the level switch by connecting them in series.
   • BReplace the 4-20 mA flow meter with a HART-enabled transmitter and use the digital signal for the level switch.
   • CReplace both the flow meter and the level switch with a single PROFIBUS PA segment that supports multiple field devices.
   • DReplace the 4-20 mA flow meter with a Foundation Fieldbus device and keep the level switch as a discrete input.
   Reveal Solution Discussion Select an answer first