AZ L-60 Controls & Automation
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
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1. Which type of controller continuously calculates an error value and
applies a correction based on proportional, integral, and derivative
terms?
A. ON/OFF Controller
B. Proportional Controller
C. PID Controller
D. Relay Controller
C. PID Controller
Rationale: A PID controller uses proportional, integral, and
derivative terms to continuously correct the error between the desired
setpoint and measured process variable.
2. In industrial automation, what is the primary function of a PLC?
A. Control mechanical relays
B. Execute programmable instructions to control machinery
C. Convert analog signals to digital
D. Measure voltage and current
B. Execute programmable instructions to control machinery
Rationale: A PLC (Programmable Logic Controller) is designed to
execute user-programmed instructions to control machines and
processes.
,3. Which communication protocol is commonly used for industrial
automation networks?
A. HTTP
B. Modbus
C. FTP
D. SMTP
B. Modbus
Rationale: Modbus is widely used in industrial environments for
communication between devices and control systems.
4. What is the main advantage of using a SCADA system in automation?
A. Provides power to devices
B. Centralized monitoring and control
C. Measures electrical resistance
D. Protects circuits from overload
B. Centralized monitoring and control
Rationale: SCADA (Supervisory Control and Data Acquisition)
allows operators to monitor and control processes from a central
location.
5. Which sensor is commonly used to detect proximity without physical
contact?
A. Thermocouple
B. Proximity sensor
C. Strain gauge
D. Load cell
B. Proximity sensor
Rationale: Proximity sensors detect the presence of objects without
physical contact using electromagnetic fields or light.
6. What type of signal do analog sensors typically provide?
A. Digital 0 or 1
B. Variable voltage or current
C. Pulse width only
D. Relay output
B. Variable voltage or current
Rationale: Analog sensors produce continuous signals (voltage or
current) proportional to the measured parameter.
7. In control systems, what does "hysteresis" refer to?
A. A type of sensor
, B. Delay between input and output response
C. Difference between switching points in ON/OFF control
D. The rate of signal decay
C. Difference between switching points in ON/OFF control
Rationale: Hysteresis prevents rapid switching by creating a
difference between the on and off points in control systems.
8. Which device converts AC voltage to DC voltage in automation
systems?
A. Transformer
B. Rectifier
C. Inverter
D. Relay
B. Rectifier
Rationale: A rectifier converts alternating current (AC) into direct
current (DC) to power DC devices.
9. What is the purpose of a contactor in an automation circuit?
A. Sense temperature
B. Switch high power circuits
C. Measure current
D. Provide analog feedback
B. Switch high power circuits
Rationale: Contactors are electromechanical devices used to switch
high current circuits on and off under control signals.
10. Which type of actuator converts electrical signals into linear
motion?
A. Solenoid
B. Servo motor
C. Stepper motor
D. Induction motor
A. Solenoid
Rationale: Solenoids are electromechanical devices that convert
electrical energy into linear motion.
11. What does HMI stand for in automation systems?
A. High Mode Indicator
B. Human-Machine Interface
C. Hybrid Motor Integration
D. Hardware Monitoring Input
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. Which type of controller continuously calculates an error value and
applies a correction based on proportional, integral, and derivative
terms?
A. ON/OFF Controller
B. Proportional Controller
C. PID Controller
D. Relay Controller
C. PID Controller
Rationale: A PID controller uses proportional, integral, and
derivative terms to continuously correct the error between the desired
setpoint and measured process variable.
2. In industrial automation, what is the primary function of a PLC?
A. Control mechanical relays
B. Execute programmable instructions to control machinery
C. Convert analog signals to digital
D. Measure voltage and current
B. Execute programmable instructions to control machinery
Rationale: A PLC (Programmable Logic Controller) is designed to
execute user-programmed instructions to control machines and
processes.
,3. Which communication protocol is commonly used for industrial
automation networks?
A. HTTP
B. Modbus
C. FTP
D. SMTP
B. Modbus
Rationale: Modbus is widely used in industrial environments for
communication between devices and control systems.
4. What is the main advantage of using a SCADA system in automation?
A. Provides power to devices
B. Centralized monitoring and control
C. Measures electrical resistance
D. Protects circuits from overload
B. Centralized monitoring and control
Rationale: SCADA (Supervisory Control and Data Acquisition)
allows operators to monitor and control processes from a central
location.
5. Which sensor is commonly used to detect proximity without physical
contact?
A. Thermocouple
B. Proximity sensor
C. Strain gauge
D. Load cell
B. Proximity sensor
Rationale: Proximity sensors detect the presence of objects without
physical contact using electromagnetic fields or light.
6. What type of signal do analog sensors typically provide?
A. Digital 0 or 1
B. Variable voltage or current
C. Pulse width only
D. Relay output
B. Variable voltage or current
Rationale: Analog sensors produce continuous signals (voltage or
current) proportional to the measured parameter.
7. In control systems, what does "hysteresis" refer to?
A. A type of sensor
, B. Delay between input and output response
C. Difference between switching points in ON/OFF control
D. The rate of signal decay
C. Difference between switching points in ON/OFF control
Rationale: Hysteresis prevents rapid switching by creating a
difference between the on and off points in control systems.
8. Which device converts AC voltage to DC voltage in automation
systems?
A. Transformer
B. Rectifier
C. Inverter
D. Relay
B. Rectifier
Rationale: A rectifier converts alternating current (AC) into direct
current (DC) to power DC devices.
9. What is the purpose of a contactor in an automation circuit?
A. Sense temperature
B. Switch high power circuits
C. Measure current
D. Provide analog feedback
B. Switch high power circuits
Rationale: Contactors are electromechanical devices used to switch
high current circuits on and off under control signals.
10. Which type of actuator converts electrical signals into linear
motion?
A. Solenoid
B. Servo motor
C. Stepper motor
D. Induction motor
A. Solenoid
Rationale: Solenoids are electromechanical devices that convert
electrical energy into linear motion.
11. What does HMI stand for in automation systems?
A. High Mode Indicator
B. Human-Machine Interface
C. Hybrid Motor Integration
D. Hardware Monitoring Input
