Mechatronics Technician Certification Exam
100 Practice Questions, Answers, and Rationales
1. What is the primary purpose of a PLC in a mechatronic system?
A. Provide mechanical motion
B. Generate power
C. Store product data
D. Control and automate processes
Rationale: PLCs are designed to control automated industrial
processes by executing logic programs.
2. Which sensor is best for detecting the presence of a metallic object
without contact?
A. Optical sensor
B. Inductive proximity sensor
C. Capacitive sensor
D. Ultrasonic sensor
Rationale: Inductive sensors detect metal objects using magnetic
fields.
3. A servo motor is primarily used when:
A. Only speed control is required
B. Only on/off motion is needed
C. Precise position control is required
D. High torque at low speed is needed
Rationale: Servos offer accurate position, speed, and torque control.
4. In pneumatics, air pressure is usually measured in:
,A. Liters
B. Newtons
C. PSI or bar
D. Joules
Rationale: Pneumatic systems operate using pressured air measured
in PSI or bar.
5. Ohm’s Law states that voltage is equal to:
A. Resistance × Power
B. Resistance × Current
C. Current ÷ Resistance
D. Resistance ÷ Current
Rationale: V = I × R is the basic electrical relationship.
6. Which device converts electrical energy to mechanical rotational
energy?
A. Transformer
B. Electric motor
C. Rectifier
D. Transistor
Rationale: Motors convert electrical energy to motion.
7. A load cell measures:
A. Temperature
B. Speed
C. Force or weight
D. Voltage
Rationale: Load cells convert mechanical force into an electrical signal.
8. In a hydraulic system, the actuator that provides linear motion is
called:
, A. Motor
B. Cylinder
C. Compressor
D. Pump
Rationale: Hydraulic cylinders produce linear motion via pressurized
fluid.
9. Which PLC programming language uses ladder-like diagrams?
A. FBD
B. ST
C. Ladder Logic
D. SFC
Rationale: Ladder Logic mimics relay diagrams and is the most
common PLC language.
10. A resistor’s color code of red-violet-brown represents:
A. 27 Ω
B. 270 Ω
C. 2700 Ω
D. 270 kΩ
Rationale: Red=2, violet=7, brown=×10 → 270 Ω.
11. The main advantage of pneumatics over hydraulics is:
A. Higher force output
B. Cleaner and easier to maintain
C. Greater precision
D. Reduced air consumption
Rationale: Air-based systems are cleaner because leaks aren’t messy.
12. Which component smooths DC output in power supplies?
100 Practice Questions, Answers, and Rationales
1. What is the primary purpose of a PLC in a mechatronic system?
A. Provide mechanical motion
B. Generate power
C. Store product data
D. Control and automate processes
Rationale: PLCs are designed to control automated industrial
processes by executing logic programs.
2. Which sensor is best for detecting the presence of a metallic object
without contact?
A. Optical sensor
B. Inductive proximity sensor
C. Capacitive sensor
D. Ultrasonic sensor
Rationale: Inductive sensors detect metal objects using magnetic
fields.
3. A servo motor is primarily used when:
A. Only speed control is required
B. Only on/off motion is needed
C. Precise position control is required
D. High torque at low speed is needed
Rationale: Servos offer accurate position, speed, and torque control.
4. In pneumatics, air pressure is usually measured in:
,A. Liters
B. Newtons
C. PSI or bar
D. Joules
Rationale: Pneumatic systems operate using pressured air measured
in PSI or bar.
5. Ohm’s Law states that voltage is equal to:
A. Resistance × Power
B. Resistance × Current
C. Current ÷ Resistance
D. Resistance ÷ Current
Rationale: V = I × R is the basic electrical relationship.
6. Which device converts electrical energy to mechanical rotational
energy?
A. Transformer
B. Electric motor
C. Rectifier
D. Transistor
Rationale: Motors convert electrical energy to motion.
7. A load cell measures:
A. Temperature
B. Speed
C. Force or weight
D. Voltage
Rationale: Load cells convert mechanical force into an electrical signal.
8. In a hydraulic system, the actuator that provides linear motion is
called:
, A. Motor
B. Cylinder
C. Compressor
D. Pump
Rationale: Hydraulic cylinders produce linear motion via pressurized
fluid.
9. Which PLC programming language uses ladder-like diagrams?
A. FBD
B. ST
C. Ladder Logic
D. SFC
Rationale: Ladder Logic mimics relay diagrams and is the most
common PLC language.
10. A resistor’s color code of red-violet-brown represents:
A. 27 Ω
B. 270 Ω
C. 2700 Ω
D. 270 kΩ
Rationale: Red=2, violet=7, brown=×10 → 270 Ω.
11. The main advantage of pneumatics over hydraulics is:
A. Higher force output
B. Cleaner and easier to maintain
C. Greater precision
D. Reduced air consumption
Rationale: Air-based systems are cleaner because leaks aren’t messy.
12. Which component smooths DC output in power supplies?
