Marine Automation and Control – Worksheet Questions

Which sensor is commonly used for high-temperature measurements in automation systems?

• Thermistor

• RTD

• Thermocouple

• Pressure transducer

The AND logic function in pneumatic systems produces an output when:

• Both input signals are present

• Only one input signal is present

• No input is applied

• The output valve is manually activated

A faulty interlock during calibration may result in:

• Unsafe equipment operation or failure to shut down during faults

• Faster operation of control valves

• Improved calibration results

• Reduced system sensitivity

A cadet observes frequent temperature oscillations. What should be adjusted first?

• Reduce proportional gain and retune integral time

• Increase derivative gain immediately

• Disable integral control

• Increase setpoint value

What is a typical input for the automation control of an electronic propulsion system?

• Engine speed and fuel injection pressure

• Boiler drum level

• Lubricating oil filter condition

• Cargo temperature

In shipboard automation, monitoring systems help engineers by:

• Detecting trends and predicting potential failures early

• Replacing the need for human supervision

• Automatically repairing faulty devices

• Operating only during port conditions

Which of the following best describes the temperature PID control process onboard a ship?

• The controller adjusts heater or cooler output to maintain a target temperature

• The operator manually changes the heater setting every few minutes

• The control valve opens fully until temperature is reached

• The system ignores temperature fluctuations

Calibration establishes a relationship between:

• Two unrelated electrical signals

• The instrument output and a reference standard value

• The sensor and its mechanical housing

• The operator and the control panel

Which step should always be performed first before calibration?

• Adjust the transmitter output to zero

• Review the manufacturer's manual and calibration procedure

• Apply random test pressures

• Record the initial reading only

Which tool is commonly used for signal simulation during calibration?

• Signal generator or simulator

• Pressure gauge

• Digital clock

• Testlamp