CBCP CBCP Building Automation & Control Systems 2

Question 1

What is the purpose of a 'trend log' in a BAS during commissioning?

Accepted Answer

Logging historical data of control variables over time to verify system performance

Answer

Recording occupant complaints

Answer

Tracking maintenance work orders

Answer

Storing emergency contact numbers

Question 2

A VAV (Variable Air Volume) box fails to modulate during FPT. Which BAS component should the commissioning agent check first?

Accepted Answer

The DDC controller output signal to the VAV actuator

Answer

The chiller compressor

Answer

The cooling tower basin level

Answer

The building electrical main breaker

Question 3

Which ASHRAE guideline specifically addresses the commissioning process for HVAC&R systems?

Accepted Answer

ASHRAE Guideline 0

Answer

ASHRAE 90.1

Answer

ASHRAE 62.1

Answer

ASHRAE 55

Question 4

What does the term 'sequence of operations' refer to in a BAS?

Accepted Answer

A written description of how control systems respond to various inputs and conditions

Answer

The order in which construction trades install equipment

Answer

The startup order for electrical panels

Answer

The maintenance schedule for air handlers

Question 5

An AHU economizer damper is found fully closed during a 40°F outdoor air temperature condition when free cooling should be available. Which BAS parameter should be reviewed?

Accepted Answer

Economizer changeover (enable) setpoint

Answer

Chilled water differential pressure setpoint

Answer

VAV box minimum airflow setpoint

Answer

Duct static pressure setpoint

Question 6

What is the purpose of a 'hardwired interlock' in a BAS control system?

Accepted Answer

To provide a software-independent safety shutdown that activates regardless of the BAS program

Answer

To link two VAV boxes together for coordinated control

Answer

To synchronize BAS communication protocols

Answer

To set a shared setpoint across multiple zones