MCQs of Control Circuits

What is the primary purpose of control circuits in HVAC systems?

• To increase energy consumption

• To ensure efficient operation, energy optimization, and safety

• To reduce system automation

• To eliminate the need for sensors

Which of the following is NOT a category of accessories in HVAC systems?

• Power and Protection

• Communication and Integration

• Manual Override

• Automation and Sensing

What is the role of dampers in HVAC systems?

• To control electrical power

• To regulate airflow by opening or closing ducts

• To measure temperature

• To convert electrical energy into mechanical motion

Which type of damper is designed to close automatically during a fire?

• Manual Damper

• Smoke Damper

• Fire Damper

• Backdraft Damper

What is the primary function of actuators in HVAC systems?

• To measure air pressure

• To convert energy into mechanical motion

• To regulate electrical power

• To monitor temperature

Which of the following is a type of actuator?

• Electric Actuator

• Thermal Actuator

• Solar Actuator

• Magnetic Actuator

What is the main purpose of a Variable Frequency Drive (VFD) in HVAC systems?

• To increase energy consumption

• To control the speed and torque of an electric motor

• To measure air quality

• To regulate temperature manually

Which stage of a VFD converts incoming AC power to DC?

• Inverter Stage

• DC Bus Stage

• Rectifier Stage

• Motor Stage

What is a key benefit of using VFDs in HVAC systems?

• Increased energy consumption

• Reduced system control

• Lower operational costs

• Higher mechanical stress on motors

Which of the following is an application of VFDs in HVAC systems?