CCST Safety Standards & Regulatory Compliance in Control Systems 2

Question 1

Which IEC standard specifically addresses functional safety of electrical/electronic/programmable electronic safety-related systems?

Accepted Answer

IEC 61508

Answer

IEC 61508 is the foundational standard for functional safety of E/E/PE safety-related systems, covering the entire safety lifecycle.

Question 2

What does SIL stand for in the context of functional safety standards?

Accepted Answer

Safety Integrity Level

Answer

SIL (Safety Integrity Level) is a measure of the risk reduction provided by a safety function, ranging from SIL 1 (lowest) to SIL 4 (highest).

Question 3

Under OSHA's Process Safety Management (PSM) standard 29 CFR 1910.119, which chemical threshold triggers PSM requirements for flammable liquids?

Accepted Answer

10,000 pounds

Answer

PSM requires 10,000 pounds as the threshold quantity for flammable liquids at or above their normal boiling point.

Question 4

Which layer of protection concept is used in LOPA (Layer of Protection Analysis) to quantify risk reduction?

Accepted Answer

Risk Reduction Factor (RRF)

Answer

RRF (Risk Reduction Factor) quantifies how much each independent protection layer reduces risk frequency in a LOPA study.

Question 5

In ISA-84 / IEC 61511, what is the term for the complete set of hardware and software that implements one or more safety instrumented functions?

Accepted Answer

Safety Instrumented System (SIS)

Answer

A Safety Instrumented System (SIS) is the complete system—including sensors, logic solvers, and final elements—that performs one or more SIFs.

(CCST) Certified Control Systems Technician Practice Test