DASA EXAM QUESTIONS AND
ANSWERS GRADED A 2024
Q: What are some common troubleshooting steps for a malfunctioning PLC system?
A: Common troubleshooting steps include checking the power supply, verifying connections,
reviewing error codes, inspecting I/O modules and wiring, and ensuring that the PLC program is
functioning correctly. Additionally, consulting system documentation and using diagnostic tools
can aid in identifying and resolving issue
1. Q: What is the primary function of a feedback loop in a control system?
A: To adjust the system's operation based on the difference between the desired and
actual output.
2. Q: How does a PID controller regulate a process?
A: By adjusting the process control variables based on Proportional, Integral, and
Derivative calculations.
3. Q: What type of signal is used to communicate between sensors and control systems?
A: Electrical signals, which can be analog or digital.
4. Q: What are the benefits of using a distributed control system?
A: Improved reliability, flexibility, and scalability by distributing control tasks across
multiple controllers.
5. Q: How do relay logic and PLC logic differ in automation systems?
A: Relay logic uses physical relays and wiring, while PLC logic uses programmable
controllers and software.
6. Q: What is the purpose of an actuator in an automation system?
A: To convert control signals into physical actions, such as moving a valve or a motor.
7. Q: Describe a scenario where a manual override might be necessary in an automated
system.
A: During system maintenance or in emergency situations where automatic controls
might fail or need to be bypassed.
ANSWERS GRADED A 2024
Q: What are some common troubleshooting steps for a malfunctioning PLC system?
A: Common troubleshooting steps include checking the power supply, verifying connections,
reviewing error codes, inspecting I/O modules and wiring, and ensuring that the PLC program is
functioning correctly. Additionally, consulting system documentation and using diagnostic tools
can aid in identifying and resolving issue
1. Q: What is the primary function of a feedback loop in a control system?
A: To adjust the system's operation based on the difference between the desired and
actual output.
2. Q: How does a PID controller regulate a process?
A: By adjusting the process control variables based on Proportional, Integral, and
Derivative calculations.
3. Q: What type of signal is used to communicate between sensors and control systems?
A: Electrical signals, which can be analog or digital.
4. Q: What are the benefits of using a distributed control system?
A: Improved reliability, flexibility, and scalability by distributing control tasks across
multiple controllers.
5. Q: How do relay logic and PLC logic differ in automation systems?
A: Relay logic uses physical relays and wiring, while PLC logic uses programmable
controllers and software.
6. Q: What is the purpose of an actuator in an automation system?
A: To convert control signals into physical actions, such as moving a valve or a motor.
7. Q: Describe a scenario where a manual override might be necessary in an automated
system.
A: During system maintenance or in emergency situations where automatic controls
might fail or need to be bypassed.
