Process Safety and Hazop MCQs 2026

SIL (Safety Integrity Level) quantifies

1. A pump efficiency ✓
2. B distillation tray count ✓
3. C polymer molecular weight ✓
4. D risk reduction of safety instrumented function ✓

Inherent safety strategy includes

1. A maximize storage without controls ✓
2. B hide MSDS from operators ✓
3. C minimize inventory of hazardous material ✓
4. D disable interlocks ✓

LEL of flammable gas is

1. A lower explosive limit concentration ✓
2. B latent heat of vaporization ✓
3. C liquid density ✓
4. D boiling point elevation ✓

Relief valve protects equipment from

1. A underpressure only always ✓
2. B overpressure ✓
3. C vacuum implosion only without design ✓
4. D catalyst poisoning ✓

HAZOP guideword MORE applied to flow means

1. A no flow ✓
2. B higher flow than intended ✓
3. C reverse flow only ✓
4. D composition change only ✓