Practice Exam Questions And Correct

Ohio Industrial Controls Technician Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• Which device is used to detect the position of a mechanical part in an

industrial control system?

• Thermocouple
• Limit switch
• Fuse
• Potentiometer

Rationale:

A limit switch mechanically detects the position or movement of a part and sends a signal to the control system.

• What is the primary function of a PLC in industrial controls?
• Amplify signals 1 / 4

• Store energy
• Automate processes
• Measure temperature

Rationale:

A PLC (Programmable Logic Controller) is designed to automate industrial processes by receiving inputs, processing logic, and controlling outputs.

• In ladder logic, what does a normally open contact represent?
• A permanent closed circuit
• A circuit that closes when the input is energized
• A high-voltage source
• A relay coil

Rationale:

A normally open (NO) contact closes when the controlling input is energized, allowing current to flow.

• Which type of motor is most commonly used in variable speed

applications?

• Synchronous motor
• AC induction motor
• Stepper motor
• Shaded-pole motor 2 / 4

Rationale:

AC induction motors are widely used in variable-speed applications due to their robustness and compatibility with variable frequency drives (VFDs).

• Which instrument is used to measure electrical current in a circuit?
• Voltmeter
• Ammeter
• Ohmmeter
• Multimeter

Rationale:

An ammeter is designed specifically to measure current flowing through a circuit.

• What is the purpose of a relay in an industrial control system?
• To reduce voltage
• To electrically control a circuit using another circuit
• To measure resistance
• To store energy

Rationale:

Relays allow a low-power control signal to switch a higher-power circuit, providing isolation and control flexibility.

• Which safety device protects motors from overload?
• Fuse
• Contactor 3 / 4

• Overload relay
• Circuit breaker

Rationale:

An overload relay protects motors by interrupting power when current exceeds safe limits for a sustained period.

• Which sensor converts temperature into an electrical signal?
• Limit switch
• Photoelectric sensor
• Thermocouple
• Proximity sensor

Rationale:

A thermocouple generates a voltage proportional to temperature, allowing electrical measurement of heat.

• What is the function of a VFD (Variable Frequency Drive)?
• Increase voltage
• Store energy
• Control motor speed
• Measure current

Rationale:

A VFD adjusts the frequency of AC power supplied to a motor, thus controlling its speed.

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