LEL of flammable gas is

lower explosive limit concentration

Inherent safety strategy includes

minimize inventory of hazardous material

SIL (Safety Integrity Level) quantifies

risk reduction of safety instrumented function

Process Safety and Hazop MCQs 2026

5 questions with detailed answers · 4 from past papers · 1 quiz batches available

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Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1Questions 1–10 of 5

Q1Past Paper · PPSC/FPSC/CSSeasy
HAZOP guideword MORE applied to flow means
1. Ano flow
2. Bhigher flow than intended
3. Creverse flow only
4. Dcomposition change only
💡 Explanation:
Systematic deviation exploration.
Q2Past Paper · PPSC/FPSC/CSSeasy
Relief valve protects equipment from
1. Aunderpressure only always
2. Boverpressure
3. Cvacuum implosion only without design
4. Dcatalyst poisoning
💡 Explanation:
PSV opens at set pressure.
Q3Past Paper · PPSC/FPSC/CSSmedium
LEL of flammable gas is
1. Alower explosive limit concentration
2. Blatent heat of vaporization
3. Cliquid density
4. Dboiling point elevation
💡 Explanation:
Minimum fuel in air for ignition.
Q4Past Paper · PPSC/FPSC/CSSmedium
Inherent safety strategy includes
1. Amaximize storage without controls
2. Bhide MSDS from operators
3. Cminimize inventory of hazardous material
4. Ddisable interlocks
💡 Explanation:
Reduce hazard at source.
Q5hard
SIL (Safety Integrity Level) quantifies
1. Apump efficiency
2. Bdistillation tray count
3. Cpolymer molecular weight
4. Drisk reduction of safety instrumented function
💡 Explanation:
IEC 61511 functional safety.

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