Practice Examination Questions And

Mechatronics Technician Level II Practice Examination Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• In a PLC scan cycle, which step is executed first?
• Output update
• Communications check
• Input scan
• Logic execution

Rationale: PLCs first read real-world inputs before solving logic, ensuring

decisions are based on current states.

2. A servo system uses feedback to:

• Reduce current draw
• Improve PLC cycle time
• Maintain precise position or speed 1 / 4

• Increase mechanical rigidity

Rationale: Servos rely on feedback loops to correct position or velocity

errors.

3. The most common signal type for industrial analog sensors is:

A. 0–120 VAC

B. 5–60 VDC

• 4–20 mA

D. 0–5 VAC

Rationale: 4–20 mA provides noise immunity and failsafe detection at 0

mA.

4. A VFD controls motor:

• Voltage only
• Frequency and voltage
• Resistance
• Inductance

Rationale: Adjusting output frequency alters motor speed; voltage is

adjusted proportionally.

• Which device isolates high-voltage circuits from PLC inputs?
• Transducer
• Rheostat
• Optocoupler
• Encoder 2 / 4

Rationale: Optocouplers allow signal transfer using light, providing

electrical isolation.

6. The purpose of a hydraulic accumulator is to:

• Filter oil
• Cool hydraulic fluid
• Store pressurized fluid energy
• Increase viscosity

Rationale: Accumulators store fluid under pressure for shock absorption or

emergency power.

7. In pneumatics, moisture is primarily removed by:

• Lubricator
• Air dryer
• Throttle valve
• Booster regulator

Rationale: Dryers prevent corrosion and contamination in pneumatic

systems.

8. A quadrature encoder provides two channels offset by:

A. 45°

B. 90°

C. 180°

D. 360°

Rationale: A 90° phase shift allows determination of direction. 3 / 4

9. The best tool to verify continuity in a circuit is:

• Clamp meter
• Oscilloscope
• Digital multimeter
• Megohmmeter

Rationale: Multimeters measure continuity using a low-voltage test signal.

• Which PLC addressing type uses letters such as I/O, M, T, C?
• Absolute
• Direct memory
• Symbolic
• Numerical

Rationale: Symbolic addressing uses tags representing functions or data

types.

11. A PID controller attempting to correct steady-state error relies on:

• Proportional action
• Derivative action
• Integral action
• Feedforward

Rationale: Integral sums past error to eliminate steady-state offset.

• A robot joint that allows rotational movement around a single axis is:
• / 4