ISA CAP Industry Regulations & Compliance 5

Question 1

The concept of 'Independence' in ISA-84/IEC 61511 requires that the Safety Instrumented System be separate from the Basic Process Control System (BPCS) because:

Accepted Answer

Common cause failures could defeat both control and safety functions simultaneously

Answer

Independence is required so that a common cause failure cannot simultaneously defeat the BPCS and the SIS, ensuring the safety layer provides genuine risk reduction.

Question 2

Under the NFPA 72 National Fire Alarm and Signaling Code, initiating devices in a fire alarm system must be:

Accepted Answer

Tested annually at minimum with records retained for three years

Answer

NFPA 72 requires initiating devices such as smoke detectors and pull stations to be tested annually, with records of inspections and tests retained for at least three years.

Question 3

In nuclear power plant instrumentation and control, which standard establishes criteria for safety systems?

Accepted Answer

IEEE 603

Answer

IEEE 603 establishes the standard criteria for safety systems of nuclear power generating stations, covering design, qualification, and independence requirements.

Question 4

When applying the hierarchy of controls to process safety, which control measure is considered most effective at reducing risk?

Accepted Answer

Elimination or substitution of the hazardous material or condition

Answer

The hierarchy of controls ranks elimination and substitution as the most effective measures because they remove the hazard rather than managing exposure to it.

Question 5

The ISA-18.2 standard addresses management of the alarm system lifecycle, including a recommended maximum steady-state alarm rate for an operator of:

Accepted Answer

No more than 144 alarms per day or approximately 1 per 10 minutes

Answer

ISA-18.2 recommends that the acceptable steady-state alarm rate not exceed approximately 1 alarm per 10 minutes (144 per day) to prevent operator overload.

(ISA CAP) ISA Certified Automation Professional Practice Test

(ISA CAP) ISA Certified Automation Professional Practice Test

ISA CAP Industry Regulations & Compliance 5