SACA Safety Systems and Functional Safety

Question 1

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

Accepted Answer

Safety Integrity Level

Answer

Safety Integration Limit

Answer

System Interlock Logic

Answer

Sequential Interlocking Layer

Question 2

Which international standard defines the overall framework for functional safety of electrical, electronic, and programmable electronic safety-related systems?

Accepted Answer

IEC 61508

Answer

IEC 61511

Answer

ISO 13849

Answer

ANSI B11.19

Question 3

A Safety Instrumented System (SIS) with a Probability of Failure on Demand (PFD) between 10⁻¹ and 10⁻² is classified at which SIL?

Accepted Answer

SIL 1

Answer

SIL 2

Answer

SIL 3

Answer

SIL 4

Question 4

What is the primary purpose of a Safety Instrumented System (SIS) in a process plant?

Accepted Answer

To bring the process to a safe state when predetermined conditions are violated

Answer

To optimize production throughput

Answer

To replace the Basic Process Control System

Answer

To monitor energy consumption in real time

Question 5

What does LOPA stand for in functional safety risk assessment?

Accepted Answer

Layers of Protection Analysis

Answer

Level of Process Automation

Answer

Logic of Plant Arrangement

Answer

Limit of Potential Accidents

Question 6

What distinguishes a safety relay from a standard control relay?

Accepted Answer

Safety relays have forced-guided (mechanically linked) contacts

Answer

Safety relays operate at higher voltages

Answer

Safety relays switch faster than standard relays

Answer

Safety relays do not require external wiring connections

Question 7

A proof test in functional safety is performed primarily to:

Accepted Answer

Verify the safety function operates correctly and detect dangerous hidden failures

Answer

Measure production throughput of a manufacturing system

Answer

Validate sensor calibration during normal operation only

Answer

Confirm software version compatibility between controllers