Building Control Systems Quiz Objective 3

What is the main source of power for a pneumatic control system?

• Electricity

• Hydraulic pressure

• Compressed air

• Natural gas

Answer explanation

The main source of power for a pneumatic control system is compressed air, as it is used to create the force needed to operate the system.

What type of control system is a pneumatic control system?

• Analog

• Digital

• Hybrid

• Mechanical

Answer explanation

A pneumatic control system is an analog control system, which uses continuous signals to control the system's behavior.

What does the zone controller's integral bimetal sensor do in a pneumatic control system?

• Bleeds air pressure to atmosphere

• Regulates the flow of oil

• Increases air pressure in the system

• Shuts off the power source

Answer explanation

The zone controller's integral bimetal sensor bleeds air pressure to atmosphere in a pneumatic control system, helping to regulate the system's pressure.

What does the controller compare the sensor pressure with in a pneumatic control system?

• Setpoint and throttling range settings

• Main air pressure and oil pressure

• Zone temperature and outside air temperature

• Compressor station pressure and network communication data

Answer explanation

The controller compares the sensor pressure with the setpoint and throttling range settings in a pneumatic control system to maintain the desired pressure level.

What does the actuators do in response to the branch pressure signal in a pneumatic control system?

• Modulate open or closed

• Increase the air pressure

• Shut down the system

• Regulate the oil flow

Answer explanation

The actuators modulate open or closed in response to the branch pressure signal in a pneumatic control system.

What is the main logic control component in a BAS control system?

• Zone sensors

• Network communications module

• Controller CPU

• Operator workstation

Answer explanation

The main logic control component in a BAS control system is the Controller CPU.

What provides all of the CPUs on the network with global data in a BAS control system?

• Network communications module

• Zone sensors

• Operator workstation

• Controller CPU

Answer explanation

The network communications module provides all of the CPUs on the network with global data in a BAS control system.

When does an interruption occur in the normal closed loop control sequence in a BAS control system?

• When the network communications module is down

• When the operator workstation is offline

• When the zone sensors malfunction

• When the operator workstation issues additional instructions

Answer explanation

An interruption occurs in the normal closed loop control sequence in a BAS control system when the operator workstation issues additional instructions.

What does the operator workstation provide to the network communications module in a BAS control system?

• Current variables for the programming of the controller CPU

• Supervisory commands for the zone devices

• Global data for all CPUs

• Changes or updates to the control schedule

Answer explanation

The operator workstation provides changes or updates to the control schedule to the network communications module in a BAS control system.

What does the network communications module provide to the controller CPUs in a BAS control system?

• Changes or updates to the control schedule

• Global data for all CPUs

• Supervisory commands for the zone devices

• Current variables for the programming of the controller CPU

Answer explanation

The network communications module provides global data for all CPUs in a BAS control system, allowing them to share information and coordinate their actions.